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vector-toc-level-2"> <a class="vector-toc-link" href="#Deep-sky_objects"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Deep-sky objects</span> </div> </a> <ul id="toc-Deep-sky_objects-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Hydrus</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 79 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-79" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">79 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Suidelike_Waterslang" title="Suidelike Waterslang – Afrikaans" lang="af" hreflang="af" data-title="Suidelike Waterslang" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AD%D9%8A%D8%A9_%D8%A7%D9%84%D9%85%D8%A7%D8%A1_(%D9%83%D9%88%D9%83%D8%A8%D8%A9)" title="حية الماء (كوكبة) – Arabic" lang="ar" hreflang="ar" data-title="حية الماء (كوكبة)" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Hydrus" title="Hydrus – Asturian" lang="ast" hreflang="ast" data-title="Hydrus" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/C%C9%99nub_Hidras%C4%B1_(b%C3%BCrc)" title="Cənub Hidrası (bürc) – Azerbaijani" lang="az" hreflang="az" data-title="Cənub Hidrası (bürc)" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Ch%C3%BAi-ch%C3%B4a-ch%C5%8D" title="Chúi-chôa-chō – Minnan" lang="nan" hreflang="nan" data-title="Chúi-chôa-chō" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%9A%D3%A9%D0%BD%D1%8C%D1%8F%D2%A1_%D0%93%D0%B8%D0%B4%D1%80%D0%B0_(%D0%B9%D0%BE%D0%BD%D0%B4%D0%BE%D2%99%D0%BB%D0%BE%D2%A1)" title="Көньяҡ Гидра (йондоҙлоҡ) – Bashkir" lang="ba" hreflang="ba" data-title="Көньяҡ Гидра (йондоҙлоҡ)" data-language-autonym="Башҡортса" data-language-local-name="Bashkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%9F%D0%B0%D1%9E%D0%B4%D0%BD%D1%91%D0%B2%D0%B0%D1%8F_%D0%93%D1%96%D0%B4%D1%80%D0%B0_(%D1%81%D1%83%D0%B7%D0%BE%D1%80%E2%80%99%D0%B5)" title="Паўднёвая Гідра (сузор’е) – Belarusian" lang="be" hreflang="be" data-title="Паўднёвая Гідра (сузор’е)" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%9F%D0%B0%D1%9E%D0%B4%D0%BD%D1%91%D0%B2%D0%B0%D1%8F_%D0%93%D1%96%D0%B4%D1%80%D0%B0" title="Паўднёвая Гідра – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Паўднёвая Гідра" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%92%D0%BE%D0%B4%D0%BD%D0%B0_%D0%B7%D0%BC%D0%B8%D1%8F_(%D1%81%D1%8A%D0%B7%D0%B2%D0%B5%D0%B7%D0%B4%D0%B8%D0%B5)" title="Водна змия (съзвездие) – Bulgarian" lang="bg" hreflang="bg" data-title="Водна змия (съзвездие)" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Mala_vodena_zmija_(sazvije%C5%BE%C4%91e)" title="Mala vodena zmija (sazviježđe) – Bosnian" lang="bs" hreflang="bs" data-title="Mala vodena zmija (sazviježđe)" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Aerouant_(steredeg)" title="Aerouant (steredeg) – Breton" lang="br" hreflang="br" data-title="Aerouant (steredeg)" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Constel%C2%B7laci%C3%B3_de_l%27Hidra_Mascle" title="Constel·lació de l'Hidra Mascle – Catalan" lang="ca" hreflang="ca" data-title="Constel·lació de l'Hidra Mascle" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Souhv%C4%9Bzd%C3%AD_Mal%C3%A9ho_vodn%C3%ADho_hada" title="Souhvězdí Malého vodního hada – Czech" lang="cs" hreflang="cs" data-title="Souhvězdí Malého vodního hada" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-co mw-list-item"><a href="https://co.wikipedia.org/wiki/Hydrus" title="Hydrus – Corsican" lang="co" hreflang="co" data-title="Hydrus" data-language-autonym="Corsu" data-language-local-name="Corsican" class="interlanguage-link-target"><span>Corsu</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Hydrus" title="Hydrus – Welsh" lang="cy" hreflang="cy" data-title="Hydrus" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Lille_S%C3%B8slange" title="Lille Søslange – Danish" lang="da" hreflang="da" data-title="Lille Søslange" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Kleine_Wasserschlange" title="Kleine Wasserschlange – German" lang="de" hreflang="de" data-title="Kleine Wasserschlange" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/L%C3%B5unah%C3%BCdra" title="Lõunahüdra – Estonian" lang="et" hreflang="et" data-title="Lõunahüdra" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%8E%CE%B4%CF%81%CE%BF%CF%82" title="Ύδρος – Greek" lang="el" hreflang="el" data-title="Ύδρος" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Hydrus" title="Hydrus – Spanish" lang="es" hreflang="es" data-title="Hydrus" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Virhidro_(konstelacio)" title="Virhidro (konstelacio) – Esperanto" lang="eo" hreflang="eo" data-title="Virhidro (konstelacio)" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Hydrus" title="Hydrus – Basque" lang="eu" hreflang="eu" data-title="Hydrus" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A2%D8%A8%D9%85%D8%A7%D8%B1" title="آبمار – Persian" lang="fa" hreflang="fa" data-title="آبمار" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Hydre_m%C3%A2le" title="Hydre mâle – French" lang="fr" hreflang="fr" data-title="Hydre mâle" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/An_Ph%C3%A9ist_Bheag" title="An Phéist Bheag – Irish" lang="ga" hreflang="ga" data-title="An Phéist Bheag" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Hydrus" title="Hydrus – Galician" lang="gl" hreflang="gl" data-title="Hydrus" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/S%C3%BAi-s%C3%A0-chho" title="Súi-sà-chho – Hakka Chinese" lang="hak" hreflang="hak" data-title="Súi-sà-chho" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="Hakka Chinese" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%AC%BC%EB%B1%80%EC%9E%90%EB%A6%AC" title="물뱀자리 – Korean" lang="ko" hreflang="ko" data-title="물뱀자리" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%A1%D6%80%D5%A1%D5%BE%D5%A1%D5%B5%D5%AB%D5%B6_%D5%80%D5%AB%D5%A4%D6%80%D5%A1" title="Հարավային Հիդրա – Armenian" lang="hy" hreflang="hy" data-title="Հարավային Հիդրա" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A8%E0%A4%B0_%E0%A4%9C%E0%A4%B2%E0%A4%B8%E0%A4%B0%E0%A5%8D%E0%A4%AA_%E0%A4%A4%E0%A4%BE%E0%A4%B0%E0%A4%BE%E0%A4%AE%E0%A4%82%E0%A4%A1%E0%A4%B2" title="नर जलसर्प तारामंडल – Hindi" lang="hi" hreflang="hi" data-title="नर जलसर्प तारामंडल" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Mala_vodena_zmija" title="Mala vodena zmija – Croatian" lang="hr" hreflang="hr" data-title="Mala vodena zmija" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Hydrus" title="Hydrus – Indonesian" lang="id" hreflang="id" data-title="Hydrus" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Lagarormurinn" title="Lagarormurinn – Icelandic" lang="is" hreflang="is" data-title="Lagarormurinn" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Idra_Maschio" title="Idra Maschio – Italian" lang="it" hreflang="it" data-title="Idra Maschio" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A0%D7%97%D7%A9_%D7%9E%D7%99%D7%9D_%D7%A7%D7%98%D7%9F" title="נחש מים קטן – Hebrew" lang="he" hreflang="he" data-title="נחש מים קטן" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Hydrus" title="Hydrus – Javanese" lang="jv" hreflang="jv" data-title="Hydrus" data-language-autonym="Jawa" data-language-local-name="Javanese" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%A1%E1%83%90%E1%83%9B%E1%83%AE%E1%83%A0%E1%83%94%E1%83%97%E1%83%98%E1%83%A1_%E1%83%B0%E1%83%98%E1%83%93%E1%83%A0%E1%83%98%E1%83%A1_%E1%83%97%E1%83%90%E1%83%9C%E1%83%90%E1%83%95%E1%83%90%E1%83%A0%E1%83%A1%E1%83%99%E1%83%95%E1%83%9A%E1%83%90%E1%83%95%E1%83%94%E1%83%93%E1%83%98" title="სამხრეთის ჰიდრის თანავარსკვლავედი – Georgian" lang="ka" hreflang="ka" data-title="სამხრეთის ჰიდრის თანავარსკვლავედი" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%9E%D2%A3%D1%82%D2%AF%D1%81%D1%82%D1%96%D0%BA_%D0%93%D0%B8%D0%B4%D1%80%D0%B0" title="Оңтүстік Гидра – Kazakh" lang="kk" hreflang="kk" data-title="Оңтүстік Гидра" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Hydrus_(ranneves)" title="Hydrus (ranneves) – Cornish" lang="kw" hreflang="kw" data-title="Hydrus (ranneves)" data-language-autonym="Kernowek" data-language-local-name="Cornish" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Nyoka_Maji_(kundinyota)" title="Nyoka Maji (kundinyota) – Swahili" lang="sw" hreflang="sw" data-title="Nyoka Maji (kundinyota)" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Hydrus_(constellatio)" title="Hydrus (constellatio) – Latin" lang="la" hreflang="la" data-title="Hydrus (constellatio)" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Dienvidu_Hidra" title="Dienvidu Hidra – Latvian" lang="lv" hreflang="lv" data-title="Dienvidu Hidra" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Hydrus_(St%C3%A4rebild)" title="Hydrus (Stärebild) – Luxembourgish" lang="lb" hreflang="lb" data-title="Hydrus (Stärebild)" data-language-autonym="Lëtzebuergesch" data-language-local-name="Luxembourgish" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Piet%C5%B3_Hidra" title="Pietų Hidra – Lithuanian" lang="lt" hreflang="lt" data-title="Pietų Hidra" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/D%C3%A9li_V%C3%ADzik%C3%ADgy%C3%B3_csillagk%C3%A9p" title="Déli Vízikígyó csillagkép – Hungarian" lang="hu" hreflang="hu" data-title="Déli Vízikígyó csillagkép" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9C%D0%B0%D0%BB%D0%B0_%D0%92%D0%BE%D0%B4%D0%BD%D0%B0_%D0%97%D0%BC%D0%B8%D1%98%D0%B0_(%D1%81%D0%BE%D1%95%D0%B2%D0%B5%D0%B7%D0%B4%D0%B8%D0%B5)" title="Мала Водна Змија (соѕвездие) – Macedonian" lang="mk" hreflang="mk" data-title="Мала Водна Змија (соѕвездие)" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%9C%E0%B4%B2%E0%B4%B8%E0%B5%BC%E0%B4%AA%E0%B5%8D%E0%B4%AA%E0%B4%82_(%E0%B4%A8%E0%B4%95%E0%B5%8D%E0%B4%B7%E0%B4%A4%E0%B5%8D%E0%B4%B0%E0%B4%B0%E0%B4%BE%E0%B4%B6%E0%B4%BF)" title="ജലസർപ്പം (നക്ഷത്രരാശി) – Malayalam" lang="ml" hreflang="ml" data-title="ജലസർപ്പം (നക്ഷത്രരാശി)" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D9%87%D9%8A%D8%AF%D8%B1%D9%88%D8%B3" title="هيدروس – Egyptian Arabic" lang="arz" hreflang="arz" data-title="هيدروس" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Ular_Air_Kecil_(buruj)" title="Ular Air Kecil (buruj) – Malay" lang="ms" hreflang="ms" data-title="Ular Air Kecil (buruj)" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/C%C5%ABi-si%C3%A8-c%C3%B4%CC%A4" title="Cūi-siè-cô̤ – Mindong" lang="cdo" hreflang="cdo" data-title="Cūi-siè-cô̤" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%9F%E1%80%AD%E1%80%AF%E1%80%80%E1%80%BA%E1%80%92%E1%80%9B%E1%80%95%E1%80%BA_(%E1%80%80%E1%80%BC%E1%80%9A%E1%80%BA%E1%80%85%E1%80%AF%E1%80%90%E1%80%94%E1%80%BA%E1%80%B8)" title="ဟိုက်ဒရပ် (ကြယ်စုတန်း) – Burmese" lang="my" hreflang="my" data-title="ဟိုက်ဒရပ် (ကြယ်စုတန်း)" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Kleine_Waterslang" title="Kleine Waterslang – Dutch" lang="nl" hreflang="nl" data-title="Kleine Waterslang" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%81%BF%E3%81%9A%E3%81%B8%E3%81%B3%E5%BA%A7" title="みずへび座 – Japanese" lang="ja" hreflang="ja" data-title="みずへび座" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Den_s%C3%B8rlige_vannslangen" title="Den sørlige vannslangen – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Den sørlige vannslangen" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Den_s%C3%B8rlege_vasslangen" title="Den sørlege vasslangen – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Den sørlege vasslangen" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Janubiy_gidra" title="Janubiy gidra – Uzbek" lang="uz" hreflang="uz" data-title="Janubiy gidra" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/W%C4%85%C5%BC_Wodny" title="Wąż Wodny – Polish" lang="pl" hreflang="pl" data-title="Wąż Wodny" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Hydrus" title="Hydrus – Portuguese" lang="pt" hreflang="pt" data-title="Hydrus" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Hidra_Austral%C4%83_(constela%C8%9Bie)" title="Hidra Australă (constelație) – Romanian" lang="ro" hreflang="ro" data-title="Hidra Australă (constelație)" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AE%D0%B6%D0%BD%D0%B0%D1%8F_%D0%93%D0%B8%D0%B4%D1%80%D0%B0" title="Южная Гидра – Russian" lang="ru" hreflang="ru" data-title="Южная Гидра" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%A1%D0%BE%D2%95%D1%83%D1%80%D1%83%D1%83_%D0%93%D0%B8%D0%B4%D1%80%D0%B0_(%D1%81%D1%83%D0%BB%D1%83%D1%81%D1%82%D0%B0%D1%80_%D0%B1%D3%A9%D0%BB%D3%A9%D1%85%D1%82%D3%A9%D1%80%D3%A9)" title="Соҕуруу Гидра (сулустар бөлөхтөрө) – Yakut" lang="sah" hreflang="sah" data-title="Соҕуруу Гидра (сулустар бөлөхтөрө)" data-language-autonym="Саха тыла" data-language-local-name="Yakut" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Hydrus" title="Hydrus – Simple English" lang="en-simple" hreflang="en-simple" data-title="Hydrus" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Vodn%C3%BD_had_(s%C3%BAhvezdie)" title="Vodný had (súhvezdie) – Slovak" lang="sk" hreflang="sk" data-title="Vodný had (súhvezdie)" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Mala_vodna_ka%C4%8Da_(ozvezdje)" title="Mala vodna kača (ozvezdje) – Slovenian" lang="sl" hreflang="sl" data-title="Mala vodna kača (ozvezdje)" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%9C%D0%B0%D0%BB%D0%B0_%D1%85%D0%B8%D0%B4%D1%80%D0%B0" title="Мала хидра – Serbian" lang="sr" hreflang="sr" data-title="Мала хидра" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Mala_vodena_zmija_(zvije%C5%BE%C4%91e)" title="Mala vodena zmija (zviježđe) – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Mala vodena zmija (zviježđe)" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Etel%C3%A4n_vesik%C3%A4%C3%A4rme" title="Etelän vesikäärme – Finnish" lang="fi" hreflang="fi" data-title="Etelän vesikäärme" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Lilla_vattenormen" title="Lilla vattenormen – Swedish" lang="sv" hreflang="sv" data-title="Lilla vattenormen" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%B9%E0%AF%88%E0%AE%A4%E0%AF%8D%E0%AE%B0%E0%AE%B8%E0%AF%8D" title="ஹைத்ரஸ் – Tamil" lang="ta" hreflang="ta" data-title="ஹைத்ரஸ்" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%81%E0%B8%A5%E0%B8%B8%E0%B9%88%E0%B8%A1%E0%B8%94%E0%B8%B2%E0%B8%A7%E0%B8%87%E0%B8%B9%E0%B9%84%E0%B8%AE%E0%B8%94%E0%B8%A3%E0%B8%B1%E0%B8%AA" title="กลุ่มดาวงูไฮดรัส – Thai" lang="th" hreflang="th" data-title="กลุ่มดาวงูไฮดรัส" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Hydrus_(tak%C4%B1my%C4%B1ld%C4%B1z)" title="Hydrus (takımyıldız) – Turkish" lang="tr" hreflang="tr" data-title="Hydrus (takımyıldız)" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D1%96%D0%B2%D0%B4%D0%B5%D0%BD%D0%BD%D0%B0_%D0%93%D1%96%D0%B4%D1%80%D0%B0" title="Південна Гідра – Ukrainian" lang="uk" hreflang="uk" data-title="Південна Гідра" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%AD%DB%8C%DB%83_%D8%A7%D9%84%D9%85%D8%A7%D8%A1" title="حیۃ الماء – Urdu" lang="ur" hreflang="ur" data-title="حیۃ الماء" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Th%E1%BB%A7y_X%C3%A0" title="Thủy Xà – Vietnamese" lang="vi" hreflang="vi" data-title="Thủy Xà" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Hydrus" title="Hydrus – Waray" lang="war" hreflang="war" data-title="Hydrus" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%B0%B4%E8%9B%87%E5%BA%A7" title="水蛇座 – Wu" lang="wuu" hreflang="wuu" data-title="水蛇座" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%B0%B4%E8%9B%87%E5%BA%A7" title="水蛇座 – Cantonese" lang="yue" hreflang="yue" data-title="水蛇座" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Hydrus" title="Hydrus – Zazaki" lang="diq" hreflang="diq" data-title="Hydrus" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-zh badge-Q17437798 badge-goodarticle mw-list-item" title="good article badge"><a href="https://zh.wikipedia.org/wiki/%E6%B0%B4%E8%9B%87%E5%BA%A7" title="水蛇座 – Chinese" lang="zh" hreflang="zh" data-title="水蛇座" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q10416#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet 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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e4/Jupiter_and_moon.png/30px-Jupiter_and_moon.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e4/Jupiter_and_moon.png/40px-Jupiter_and_moon.png 2x" data-file-width="128" data-file-height="128" /></span></span> <a rel="nofollow" class="external text" href="http://www.wikisky.org/?ra=2&de=-70&zoom=2&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=1&show_galaxies=1&img_source=IMG_all">02<sup>h</sup> 00<sup>m</sup> 00<sup>s</sup>, −70° 00′ 00″</a></span></div></div> <div id="mw-indicator-featured-star" class="mw-indicator"><div class="mw-parser-output"><span typeof="mw:File"><a href="/wiki/Wikipedia:Featured_articles*" title="This is a featured article. Click here for more information."><img alt="Featured article" src="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/20px-Cscr-featured.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/30px-Cscr-featured.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e7/Cscr-featured.svg/40px-Cscr-featured.svg.png 2x" data-file-width="466" data-file-height="443" /></a></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Constellation in the southern celestial hemisphere</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="/wiki/Hydrus_(disambiguation)" class="mw-disambig" title="Hydrus (disambiguation)">Hydrus (disambiguation)</a>. Not to be confused with the equatorial constellation of <a href="/wiki/Hydra_(constellation)" title="Hydra (constellation)">Hydra</a>.</div><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"Hyi" redirects here. For other uses, see <a href="/wiki/HYI_(disambiguation)" class="mw-redirect mw-disambig" title="HYI (disambiguation)">HYI</a>.</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox plainlist"><caption class="infobox-title">Hydrus</caption><tbody><tr><td colspan="2" class="infobox-subheader" style="font-size: 110%;">Constellation</td></tr><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Hydrus_IAU.svg" class="mw-file-description" title="Hydrus"><img alt="Hydrus" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Hydrus_IAU.svg/290px-Hydrus_IAU.svg.png" decoding="async" width="290" height="313" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Hydrus_IAU.svg/435px-Hydrus_IAU.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Hydrus_IAU.svg/580px-Hydrus_IAU.svg.png 2x" data-file-width="629" data-file-height="678" /></a></span><div class="infobox-caption"><a href="/wiki/List_of_stars_in_Hydrus" title="List of stars in Hydrus">List of stars in Hydrus</a></div></td></tr><tr><th scope="row" class="infobox-label">Abbreviation</th><td class="infobox-data">Hyi</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Genitive_case" title="Genitive case">Genitive</a></th><td class="infobox-data">Hydri</td></tr><tr><th scope="row" class="infobox-label">Pronunciation</th><td class="infobox-data"><span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="'h' in 'hi'">h</span><span title="/aɪ/: 'i' in 'tide'">aɪ</span><span title="'d' in 'dye'">d</span><span title="'r' in 'rye'">r</span><span title="/ə/: 'a' in 'about'">ə</span><span title="'s' in 'sigh'">s</span></span>/</a></span></span>, genitive <span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="'h' in 'hi'">h</span><span title="/aɪ/: 'i' in 'tide'">aɪ</span><span title="'d' in 'dye'">d</span><span title="'r' in 'rye'">r</span><span title="/aɪ/: 'i' in 'tide'">aɪ</span></span>/</a></span></span></td></tr><tr><th scope="row" class="infobox-label">Symbolism</th><td class="infobox-data">the water snake</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Right_ascension" title="Right ascension">Right ascension</a></th><td class="infobox-data"><span class="nowrap">00<sup>h</sup> 06.1<sup>m</sup> </span> to <span class="nowrap">04<sup>h</sup> 35.1<sup>m</sup> </span><sup id="cite_ref-boundary_1-0" class="reference"><a href="#cite_note-boundary-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Declination" title="Declination">Declination</a></th><td class="infobox-data">−57.85° to −82.06°<sup id="cite_ref-boundary_1-1" class="reference"><a href="#cite_note-boundary-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr><th scope="row" class="infobox-label">Quadrant</th><td class="infobox-data">SQ1</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/88_modern_constellations_by_area" class="mw-redirect" title="88 modern constellations by area">Area</a></th><td class="infobox-data">243 sq. deg. (<a href="/wiki/88_modern_constellations_by_area" class="mw-redirect" title="88 modern constellations by area">61st</a>)</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Asterism_(astronomy)" title="Asterism (astronomy)">Main stars</a></th><td class="infobox-data">3</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Bayer_designation" title="Bayer designation">Bayer</a>/<a href="/wiki/Flamsteed_designation" title="Flamsteed designation">Flamsteed</a><br />stars</th><td class="infobox-data">19</td></tr><tr><th scope="row" class="infobox-label">Stars with <a href="/wiki/Exoplanet" title="Exoplanet">planets</a></th><td class="infobox-data">4</td></tr><tr><th scope="row" class="infobox-label">Stars brighter than 3.00<sup>m</sup></th><td class="infobox-data">2</td></tr><tr><th scope="row" class="infobox-label">Stars within 10.00 pc (32.62 ly)</th><td class="infobox-data">1</td></tr><tr><th scope="row" class="infobox-label">Brightest star</th><td class="infobox-data"><a href="/wiki/Beta_Hydri" title="Beta Hydri">β Hyi</a> (2.82<sup><a href="/wiki/Apparent_magnitude" title="Apparent magnitude">m</a></sup>)</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Messier_object" title="Messier object">Messier objects</a></th><td class="infobox-data">none</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Meteor_shower" title="Meteor shower">Meteor showers</a></th><td class="infobox-data">none</td></tr><tr><th scope="row" class="infobox-label">Bordering<br />constellations</th><td class="infobox-data"><a href="/wiki/Dorado" title="Dorado">Dorado</a><br /><a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a><br /><a href="/wiki/Horologium_(constellation)" title="Horologium (constellation)">Horologium</a><br /><a href="/wiki/Mensa_(constellation)" title="Mensa (constellation)">Mensa</a><br /><a href="/wiki/Octans" title="Octans">Octans</a><br /><a href="/wiki/Phoenix_(constellation)" title="Phoenix (constellation)">Phoenix</a> (corner)<br /><a href="/wiki/Reticulum" title="Reticulum">Reticulum</a><br /><a href="/wiki/Tucana" title="Tucana">Tucana</a></td></tr><tr><td colspan="2" class="infobox-below" style="font-size: smaller;"><b>Visible at latitudes between +<a href="/wiki/8th_parallel_north" title="8th parallel north">8</a>° and −<a href="/wiki/South_Pole" title="South Pole">90</a>°.</b><br /><b>Best visible at 21:00 (9 p.m.) during the month of <span style="font-size:120%">November</span>.</b></td></tr></tbody></table> <p><b>Hydrus</b> <span class="rt-commentedText nowrap"><span class="IPA nopopups noexcerpt" lang="en-fonipa"><a href="/wiki/Help:IPA/English" title="Help:IPA/English">/<span style="border-bottom:1px dotted"><span title="/ˈ/: primary stress follows">ˈ</span><span title="'h' in 'hi'">h</span><span title="/aɪ/: 'i' in 'tide'">aɪ</span><span title="'d' in 'dye'">d</span><span title="'r' in 'rye'">r</span><span title="/ə/: 'a' in 'about'">ə</span><span title="'s' in 'sigh'">s</span></span>/</a></span></span> is a small <a href="/wiki/Constellation" title="Constellation">constellation</a> in the deep <a href="/wiki/Southern_Celestial_Hemisphere" class="mw-redirect" title="Southern Celestial Hemisphere">southern sky</a>. It was one of twelve constellations created by <a href="/wiki/Petrus_Plancius" title="Petrus Plancius">Petrus Plancius</a> from the observations of <a href="/wiki/Pieter_Dirkszoon_Keyser" title="Pieter Dirkszoon Keyser">Pieter Dirkszoon Keyser</a> and <a href="/wiki/Frederick_de_Houtman" title="Frederick de Houtman">Frederick de Houtman</a> and it first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius and <a href="/wiki/Jodocus_Hondius" title="Jodocus Hondius">Jodocus Hondius</a>. The first depiction of this constellation in a celestial atlas was in <a href="/wiki/Johann_Bayer" title="Johann Bayer">Johann Bayer</a>'s <a href="/wiki/Uranometria" title="Uranometria">Uranometria</a> of 1603. The French explorer and astronomer <a href="/wiki/Nicolas-Louis_de_Lacaille" title="Nicolas-Louis de Lacaille">Nicolas Louis de Lacaille</a> charted the brighter <a href="/wiki/Star" title="Star">stars</a> and gave their <a href="/wiki/Bayer_designation" title="Bayer designation">Bayer designations</a> in 1756. Its name means "male water snake", as opposed to <a href="/wiki/Hydra_(constellation)" title="Hydra (constellation)">Hydra</a>, a much larger constellation that represents a female water snake. It remains below the horizon for most <a href="/wiki/Northern_Hemisphere" title="Northern Hemisphere">Northern Hemisphere</a> observers. </p><p>The brightest star is the 2.8-<a href="/wiki/Apparent_magnitude" title="Apparent magnitude">magnitude</a> <a href="/wiki/Beta_Hydri" title="Beta Hydri">Beta Hydri</a>, also the closest reasonably bright star to the <a href="/wiki/Pole_star#Southern_pole_star_(South_Star)" title="Pole star">south celestial pole</a>. Pulsating between magnitude 3.26 and 3.33, <a href="/wiki/Gamma_Hydri" title="Gamma Hydri">Gamma Hydri</a> is a variable <a href="/wiki/Red_giant" title="Red giant">red giant</a> 60 times the diameter of the <a href="/wiki/Sun" title="Sun">Sun</a>. Lying near it is <a href="/wiki/VW_Hydri" title="VW Hydri">VW Hydri</a>, one of the brightest <a href="/wiki/Dwarf_nova" title="Dwarf nova">dwarf novae</a> in the heavens. Four star systems in Hydrus have been found to have <a href="/wiki/Exoplanet" title="Exoplanet">exoplanets</a> to date, including <a href="/wiki/HD_10180" title="HD 10180">HD 10180</a>, which could bear up to nine planetary companions. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg/350px-Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg" decoding="async" width="350" height="321" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg/525px-Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg/700px-Johann_Bayer_-_Uraniometria_-_Southern_Birds.jpg 2x" data-file-width="2385" data-file-height="2187" /></a><figcaption>Hydrus (lower right) in an extract from <a href="/wiki/Johann_Bayer" title="Johann Bayer">Johann Bayer</a>'s <i><a href="/wiki/Uranometria" title="Uranometria">Uranometria</a></i>, its first appearance in a celestial atlas.</figcaption></figure> <p>Hydrus was one of the twelve constellations established by the astronomer <a href="/wiki/Petrus_Plancius" title="Petrus Plancius">Petrus Plancius</a> from the observations of the southern sky by the Dutch explorers <a href="/wiki/Pieter_Dirkszoon_Keyser" title="Pieter Dirkszoon Keyser">Pieter Dirkszoon Keyser</a> and <a href="/wiki/Frederick_de_Houtman" title="Frederick de Houtman">Frederick de Houtman</a>, who had sailed on the first Dutch trading expedition, known as the <i><a href="/wiki/First_Dutch_Expedition_to_Indonesia" class="mw-redirect" title="First Dutch Expedition to Indonesia">Eerste Schipvaart</a></i>, to the <a href="/wiki/East_Indies" title="East Indies">East Indies</a>. It first appeared on a 35-cm (14 in) diameter celestial globe published in late 1597 (or early 1598) in Amsterdam by Plancius with <a href="/wiki/Jodocus_Hondius" title="Jodocus Hondius">Jodocus Hondius</a>. The first depiction of this constellation in a celestial atlas was in the German cartographer <a href="/wiki/Johann_Bayer" title="Johann Bayer">Johann Bayer</a>'s <i><a href="/wiki/Uranometria" title="Uranometria">Uranometria</a></i> of 1603.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> De Houtman included it in his southern star catalogue the same year under the Dutch name <i>De Waterslang</i>, "The Water Snake",<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> it representing a type of snake encountered on the expedition rather than a mythical creature.<sup id="cite_ref-ridphydrus_5-0" class="reference"><a href="#cite_note-ridphydrus-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The French explorer and astronomer <a href="/wiki/Nicolas-Louis_de_Lacaille" title="Nicolas-Louis de Lacaille">Nicolas Louis de Lacaille</a> called it <i>l’Hydre Mâle</i> on the 1756 version of his <a href="/wiki/Planisphere" title="Planisphere">planisphere</a> of the southern skies, distinguishing it from the feminine <a href="/wiki/Hydra_(constellation)" title="Hydra (constellation)">Hydra</a>. The French name was retained by <a href="/wiki/Jean_Nicolas_Fortin" title="Jean Nicolas Fortin">Jean Fortin</a> in 1776 for his <i>Atlas Céleste</i>, while Lacaille <a href="/wiki/Latin" title="Latin">Latinised</a> the name to Hydrus for his revised <i>Coelum Australe Stelliferum</i> in 1763.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:left;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Characteristics">Characteristics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=2" title="Edit section: Characteristics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Irregular in shape,<sup id="cite_ref-motz_7-0" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Hydrus is bordered by <a href="/wiki/Mensa_(constellation)" title="Mensa (constellation)">Mensa</a> to the southeast, <a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a> to the east, <a href="/wiki/Horologium_(constellation)" title="Horologium (constellation)">Horologium</a> and <a href="/wiki/Reticulum" title="Reticulum">Reticulum</a> to the northeast, <a href="/wiki/Phoenix_(constellation)" title="Phoenix (constellation)">Phoenix</a> to the north, <a href="/wiki/Tucana" title="Tucana">Tucana</a> to the northwest and west, and <a href="/wiki/Octans" title="Octans">Octans</a> to the south; Lacaille had shortened Hydrus' tail to make space for this last constellation he had drawn up.<sup id="cite_ref-ridphydrus_5-1" class="reference"><a href="#cite_note-ridphydrus-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Covering 243 square degrees and 0.589% of the night sky, it ranks 61st of the 88 constellations in size.<sup id="cite_ref-bagnall251_8-0" class="reference"><a href="#cite_note-bagnall251-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> The three-letter abbreviation for the constellation, as adopted by the <a href="/wiki/International_Astronomical_Union" title="International Astronomical Union">International Astronomical Union</a> in 1922, is "Hyi".<sup id="cite_ref-pa30_469_9-0" class="reference"><a href="#cite_note-pa30_469-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The official constellation boundaries, as set by Belgian astronomer <a href="/wiki/Eug%C3%A8ne_Joseph_Delporte" title="Eugène Joseph Delporte">Eugène Delporte</a> in 1930, are defined by a polygon of 12 segments. In the <a href="/wiki/Equatorial_coordinate_system" title="Equatorial coordinate system">equatorial coordinate system</a>, the <a href="/wiki/Right_ascension" title="Right ascension">right ascension</a> coordinates of these borders lie between <span class="nowrap">00<sup>h</sup> 06.1<sup>m</sup> </span> and <span class="nowrap">04<sup>h</sup> 35.1<sup>m</sup> </span>, while the <a href="/wiki/Declination" title="Declination">declination</a> coordinates are between −57.85° and −82.06°.<sup id="cite_ref-boundary_1-2" class="reference"><a href="#cite_note-boundary-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> As one of the deep southern constellations, it remains below the horizon at latitudes north of the <a href="/wiki/30th_parallel_north" title="30th parallel north">30th parallel</a> in the <a href="/wiki/Northern_Hemisphere" title="Northern Hemisphere">Northern Hemisphere</a>, and is circumpolar at latitudes south of the <a href="/wiki/50th_parallel_south" title="50th parallel south">50th parallel</a> in the <a href="/wiki/Southern_Hemisphere" title="Southern Hemisphere">Southern Hemisphere</a>.<sup id="cite_ref-motz_7-1" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Herman_Melville" title="Herman Melville">Herman Melville</a> mentions it and <a href="/wiki/Argo_Navis" title="Argo Navis">Argo Navis</a> in <i><a href="/wiki/Moby_Dick" class="mw-redirect" title="Moby Dick">Moby Dick</a></i> "beneath effulgent Antarctic Skies", highlighting his knowledge of the southern constellations from whaling voyages.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> A line drawn between the long axis of the <a href="/wiki/Crux" title="Crux">Southern Cross</a> to <a href="/wiki/Beta_Hydri" title="Beta Hydri">Beta Hydri</a> and then extended 4.5 times will mark a point due south.<sup id="cite_ref-Stilwell_2010_11-0" class="reference"><a href="#cite_note-Stilwell_2010-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Hydrus <a href="/wiki/Culmination" title="Culmination">culminates</a> at midnight around 26 October.<sup id="cite_ref-hartungs_12-0" class="reference"><a href="#cite_note-hartungs-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Features">Features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=3" title="Edit section: Features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Constellation_Hydrus.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Constellation_Hydrus.jpg/250px-Constellation_Hydrus.jpg" decoding="async" width="250" height="375" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/94/Constellation_Hydrus.jpg/375px-Constellation_Hydrus.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/9/94/Constellation_Hydrus.jpg 2x" data-file-width="427" data-file-height="640" /></a><figcaption>The constellation Hydrus as it can be seen by the naked eye</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Stars">Stars</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=4" title="Edit section: Stars"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/List_of_stars_in_Hydrus" title="List of stars in Hydrus">List of stars in Hydrus</a></div> <p>Keyzer and de Houtman assigned fifteen stars to the constellation in their Malay and Madagascan vocabulary, with a star that would be later designated as <a href="/wiki/Alpha_Hydri" title="Alpha Hydri">Alpha Hydri</a> marking the head, Gamma the chest and a number of stars that were later allocated to Tucana, Reticulum, Mensa and Horologium marking the body and tail.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Lacaille charted and designated 20 stars with the <a href="/wiki/Bayer_designation" title="Bayer designation">Bayer designations</a> Alpha through to Tau in 1756. Of these, he used the designations Eta, Pi and Tau twice each, for three sets of two stars close together, and omitted Omicron and Xi. He assigned Rho to a star that subsequent astronomers were unable to find.<sup id="cite_ref-wagman_14-0" class="reference"><a href="#cite_note-wagman-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p><p>Beta Hydri, the brightest star in Hydrus, is a yellow star of <a href="/wiki/Apparent_magnitude" title="Apparent magnitude">apparent magnitude</a> 2.8, lying 24 <a href="/wiki/Light-year" title="Light-year">light-years</a> from Earth.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> It has about 104% of the <a href="/wiki/Solar_mass" title="Solar mass">mass of the Sun</a> and 181% of the Sun's radius, with more than three times the Sun's <a href="/wiki/Luminosity" title="Luminosity">luminosity</a>.<sup id="cite_ref-aaa527_A37_16-0" class="reference"><a href="#cite_note-aaa527_A37-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Stellar_spectrum" class="mw-redirect" title="Stellar spectrum">spectrum</a> of this star matches a <a href="/wiki/Stellar_classification" title="Stellar classification">stellar classification</a> of G2 IV, with the <a href="/wiki/Luminosity_class" class="mw-redirect" title="Luminosity class">luminosity class</a> of 'IV' indicating this is a <a href="/wiki/Subgiant" title="Subgiant">subgiant star</a>. As such, it is a slightly more <a href="/wiki/Stellar_evolution" title="Stellar evolution">evolved</a> star than the Sun, with the supply of hydrogen fuel at its <a href="/wiki/Stellar_structure" title="Stellar structure">core</a> becoming exhausted. It is the nearest subgiant star to the Sun and one of the oldest stars in the solar neighbourhood. Thought to be between 6.4 and 7.1 billion years old, this star bears some resemblance to what the Sun may look like in the far distant future, making it an object of interest to astronomers.<sup id="cite_ref-aaa527_A37_16-1" class="reference"><a href="#cite_note-aaa527_A37-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> It is also the closest bright star to the <a href="/wiki/Pole_star#Southern_pole_star_(South_Star)" title="Pole star">south celestial pole</a>.<sup id="cite_ref-motz_7-2" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Located at the northern edge of the constellation and just southwest of <a href="/wiki/Achernar" title="Achernar">Achernar</a> is <a href="/wiki/Alpha_Hydri" title="Alpha Hydri">Alpha Hydri</a>,<sup id="cite_ref-moore2005_17-0" class="reference"><a href="#cite_note-moore2005-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> a white sub-giant star of magnitude 2.9, situated 72 light-years from Earth.<sup id="cite_ref-kaleralpha_18-0" class="reference"><a href="#cite_note-kaleralpha-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> Of spectral type F0IV,<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> it is beginning to cool and enlarge as it uses up its supply of hydrogen. It is twice as massive and 3.3 times as wide as the Sun and 26 times more luminous.<sup id="cite_ref-kaleralpha_18-1" class="reference"><a href="#cite_note-kaleralpha-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> A line drawn between Alpha Hydri and <a href="/wiki/Beta_Centauri" title="Beta Centauri">Beta Centauri</a> is bisected by the south celestial pole.<sup id="cite_ref-hartungs_12-1" class="reference"><a href="#cite_note-hartungs-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>In the southeastern corner of the constellation is <a href="/wiki/Gamma_Hydri" title="Gamma Hydri">Gamma Hydri</a>,<sup id="cite_ref-motz_7-3" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> a <a href="/wiki/Red_giant" title="Red giant">red giant</a> of spectral type M2III located 214 light-years from Earth.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> It is a <a href="/wiki/Semiregular_variable_star" title="Semiregular variable star">semi-regular variable</a> star, pulsating between magnitudes 3.26 and 3.33. Observations over five years were not able to establish its <a href="https://en.wiktionary.org/wiki/periodicity" class="extiw" title="wikt:periodicity">periodicity</a>.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> It is around 1.5 to 2 times as massive as the Sun, and has expanded to about 60 times the Sun's diameter. It shines with about 655 times the luminosity of the Sun.<sup id="cite_ref-kalergamma_22-0" class="reference"><a href="#cite_note-kalergamma-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> Located 3° northeast of Gamma is the <a href="/wiki/VW_Hydri" title="VW Hydri">VW Hydri</a>, a <a href="/wiki/Dwarf_nova" title="Dwarf nova">dwarf nova</a> of the SU Ursae Majoris type. It is a close <a href="/wiki/Binary_star" title="Binary star">binary</a> system that consists of a <a href="/wiki/White_dwarf" title="White dwarf">white dwarf</a> and another star, the former drawing off matter from the latter into a bright <a href="/wiki/Accretion_disk" title="Accretion disk">accretion disk</a>. These systems are characterised by frequent eruptions and less frequent supereruptions. The former are smooth, while the latter exhibit short "superhumps" of heightened activity.<sup id="cite_ref-AAVSOVW_23-0" class="reference"><a href="#cite_note-AAVSOVW-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> One of the brightest dwarf novae in the sky,<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> it has a baseline magnitude of 14.4 and can brighten to magnitude 8.4 during peak activity.<sup id="cite_ref-AAVSOVW_23-1" class="reference"><a href="#cite_note-AAVSOVW-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> <a href="/w/index.php?title=BL_Hydri&action=edit&redlink=1" class="new" title="BL Hydri (page does not exist)">BL Hydri</a> is another close binary system composed of a low-mass star and a strongly magnetic white dwarf. Known as a <a href="/wiki/Polar_(cataclysmic_variable_star)" class="mw-redirect" title="Polar (cataclysmic variable star)">polar</a> or AM Herculis variable, these produce <a href="/wiki/Polarization_(waves)" title="Polarization (waves)">polarized</a> optical and <a href="/wiki/Infrared" title="Infrared">infrared</a> emissions and intense soft and hard <a href="/wiki/X-ray" title="X-ray">X-ray</a> emissions to the frequency of the white dwarf's <a href="/wiki/Rotation_period" class="mw-redirect" title="Rotation period">rotation period</a>—in this case 113.6 minutes.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p><p>There are two notable optical double stars in Hydrus. Pi Hydri, composed of <a href="/wiki/Pi1_Hydri" class="mw-redirect" title="Pi1 Hydri">Pi<sup>1</sup> Hydri</a> and <a href="/wiki/Pi2_Hydri" class="mw-redirect" title="Pi2 Hydri">Pi<sup>2</sup> Hydri</a>, is divisible in binoculars.<sup id="cite_ref-motz_7-4" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Around 476 light-years distant,<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> Pi<sup>1</sup> is a red giant of spectral type M1III that varies between magnitudes 5.52 and 5.58.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> Pi<sup>2</sup> is an orange giant of spectral type K2III and shining with a magnitude of 5.7, around 488 light-years from Earth.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </p><p>Eta Hydri is the other optical double, composed of <a href="/wiki/Eta1_Hydri" title="Eta1 Hydri">Eta<sup>1</sup></a> and <a href="/wiki/Eta2_Hydri" title="Eta2 Hydri">Eta<sup>2</sup></a>.<sup id="cite_ref-motz_7-5" class="reference"><a href="#cite_note-motz-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Eta<sup>1</sup> is a blue-white main sequence star of spectral type B9V that was suspected of being variable,<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> and is located just over 700 light-years away.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> Eta<sup>2</sup> has a magnitude of 4.7 and is a yellow giant star of spectral type G8.5III around 218 light-years distant,<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> which has evolved off the main sequence and is expanding and cooling on its way to becoming a red giant. Calculations of its mass indicate it was most likely a white A-type main sequence star for most of its existence, around twice the mass of the Sun. A planet, <a href="/wiki/Eta2_Hydri_b" title="Eta2 Hydri b">Eta2 Hydri b</a>, greater than 6.5 times the mass of <a href="/wiki/Jupiter" title="Jupiter">Jupiter</a> was discovered in 2005, orbiting around Eta<sup>2</sup> every 711 days at a distance of 1.93 <a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical units</a> (AU).<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p><p>Three other systems have been found to have planets, most notably the <a href="/wiki/Solar_analog#Solar-type" title="Solar analog">Sun-like</a> star <a href="/wiki/HD_10180" title="HD 10180">HD 10180</a>, which has seven planets, plus possibly an additional two for a total of nine—as of 2012 more than any other system to date, including the Solar System.<sup id="cite_ref-Tuomi_33-0" class="reference"><a href="#cite_note-Tuomi-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> Lying around 127 light-years (39 parsecs) from the Earth,<sup id="cite_ref-BBC11070991_34-0" class="reference"><a href="#cite_note-BBC11070991-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> it has an apparent magnitude of 7.33.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/HD_1237" title="HD 1237">GJ 3021</a> is a <a href="/wiki/Solar_analog" title="Solar analog">solar twin</a>—a star very like the Sun—around 57 light-years distant with a spectral type G8V and magnitude of 6.7.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> It has a <a href="/wiki/Giant_planet" title="Giant planet">Jovian planet</a> companion (<a href="/wiki/Gliese_3021_b" class="mw-redirect" title="Gliese 3021 b">GJ 3021 b</a>). Orbiting about 0.5 AU from its star, it has a minimum mass 3.37 times that of Jupiter and a period of around 133 days.<sup id="cite_ref-Naef2001_37-0" class="reference"><a href="#cite_note-Naef2001-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> The system is a complex one as the faint star GJ 3021B orbits at a distance of 68 AU; it is a red dwarf of spectral type M4V.<sup id="cite_ref-Chauvin2007_38-0" class="reference"><a href="#cite_note-Chauvin2007-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/HD_20003" title="HD 20003">HD 20003</a> is a star of magnitude 8.37. It is a yellow main sequence star of spectral type G8V a little cooler and smaller than the Sun around 143 light-years away. It has two planets that are around 12 and 13.5 times as massive as the Earth with periods of just under 12 and 34 days respectively.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Deep-sky_objects">Deep-sky objects</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=5" title="Edit section: Deep-sky objects"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Hydrus contains only faint <a href="/wiki/Deep-sky_object" title="Deep-sky object">deep-sky objects</a>. <a href="/w/index.php?title=IC_1717&action=edit&redlink=1" class="new" title="IC 1717 (page does not exist)">IC 1717</a> was a deep-sky object discovered by the Danish astronomer <a href="/wiki/John_Louis_Emil_Dreyer" title="John Louis Emil Dreyer">John Louis Emil Dreyer</a> in the late 19th century. The object at the coordinate Dreyer observed is no longer there, and is now a mystery. It was very likely to have been a faint <a href="/wiki/Comet" title="Comet">comet</a>.<sup id="cite_ref-bagnall251-2_40-0" class="reference"><a href="#cite_note-bagnall251-2-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> <a href="/wiki/PGC_6240" title="PGC 6240">PGC 6240</a>, known as the White Rose Galaxy, is a giant <a href="/wiki/Spiral_galaxy" title="Spiral galaxy">spiral galaxy</a> surrounded by shells resembling rose petals, located around 345 million light years from the Solar System. Unusually, it has cohorts of globular clusters of three distinct ages suggesting bouts of post-starburst formation following a merger with another galaxy.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> The constellation also contains a spiral galaxy, <a href="/wiki/NGC_1511" title="NGC 1511">NGC 1511</a>, which lies edge on to observers on Earth and is readily viewed in amateur telescopes.<sup id="cite_ref-hartungs_12-2" class="reference"><a href="#cite_note-hartungs-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>Located mostly in <a href="/wiki/Dorado" title="Dorado">Dorado</a>, the <a href="/wiki/Large_Magellanic_Cloud" title="Large Magellanic Cloud">Large Magellanic Cloud</a> extends into Hydrus.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> The globular cluster <a href="/wiki/NGC_1466" title="NGC 1466">NGC 1466</a> is an outlying component of the galaxy, and contains many <a href="/wiki/RR_Lyrae_variable" title="RR Lyrae variable">RR Lyrae-type variable stars</a>. It has a magnitude of 11.59 and is thought to be over 12 billion years old.<sup id="cite_ref-westerlund_43-0" class="reference"><a href="#cite_note-westerlund-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> Two stars, HD 24188 of magnitude 6.3 and HD 24115 of magnitude 9.0, lie nearby in its foreground.<sup id="cite_ref-hartungs_12-3" class="reference"><a href="#cite_note-hartungs-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> <a href="/wiki/NGC_602" title="NGC 602">NGC 602</a> is composed of an <a href="/wiki/Emission_nebula" title="Emission nebula">emission nebula</a> and a young, bright <a href="/wiki/Open_cluster" title="Open cluster">open cluster</a> of stars that is an outlying component on the eastern edge of the <a href="/wiki/Small_Magellanic_Cloud" title="Small Magellanic Cloud">Small Magellanic Cloud</a>,<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> a <a href="/wiki/Satellite_galaxy" title="Satellite galaxy">satellite galaxy</a> to the <a href="/wiki/Milky_Way" title="Milky Way">Milky Way</a>. Most of the cloud is located in the neighbouring constellation Tucana.<sup id="cite_ref-cambridge_45-0" class="reference"><a href="#cite_note-cambridge-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=6" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Hydrus_(Chinese_astronomy)" class="mw-redirect" title="Hydrus (Chinese astronomy)">Hydrus (Chinese astronomy)</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=7" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-boundary-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-boundary_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-boundary_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-boundary_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation journal cs1"><a rel="nofollow" class="external text" href="https://www.iau.org/public/themes/constellations/#hyi">"Hydrus, Constellation Boundary"</a>. <i>The Constellations</i><span class="reference-accessdate">. Retrieved <span class="nowrap">11 September</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Constellations&rft.atitle=Hydrus%2C+Constellation+Boundary&rft_id=https%3A%2F%2Fwww.iau.org%2Fpublic%2Fthemes%2Fconstellations%2F%23hyi&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRidpath" class="citation web cs1"><a href="/wiki/Ian_Ridpath" title="Ian Ridpath">Ridpath, Ian</a>. <a rel="nofollow" class="external text" href="http://www.ianridpath.com/startales/bayer-southern.html">"Johann Bayer's Southern Star Chart"</a>. <i>Star Tales</i>. self-published<span class="reference-accessdate">. Retrieved <span class="nowrap">23 August</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Star+Tales&rft.atitle=Johann+Bayer%27s+Southern+Star+Chart&rft.aulast=Ridpath&rft.aufirst=Ian&rft_id=http%3A%2F%2Fwww.ianridpath.com%2Fstartales%2Fbayer-southern.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://chandra.harvard.edu/photo/constellations/hydrus.html">"Hydrus (Water Snake)"</a>. Chandra X-ray Observatory<span class="reference-accessdate">. Retrieved <span class="nowrap">10 July</span> 2012</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Hydrus+%28Water+Snake%29&rft.pub=Chandra+X-ray+Observatory&rft_id=http%3A%2F%2Fchandra.harvard.edu%2Fphoto%2Fconstellations%2Fhydrus.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRidpath" class="citation web cs1">Ridpath, Ian. <a rel="nofollow" class="external text" href="http://www.ianridpath.com/startales/startales1c.html#houtman">"Frederick de Houtman's Catalogue"</a>. <i>Star Tales</i>. self-published<span class="reference-accessdate">. Retrieved <span class="nowrap">11 September</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Star+Tales&rft.atitle=Frederick+de+Houtman%27s+Catalogue&rft.aulast=Ridpath&rft.aufirst=Ian&rft_id=http%3A%2F%2Fwww.ianridpath.com%2Fstartales%2Fstartales1c.html%23houtman&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-ridphydrus-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-ridphydrus_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ridphydrus_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRidpath" class="citation web cs1"><a href="/wiki/Ian_Ridpath" title="Ian Ridpath">Ridpath, Ian</a>. <a rel="nofollow" class="external text" href="http://www.ianridpath.com/startales/hydrus.html">"Hydrus—the Lesser Water Snake"</a>. <i>Star Tales</i>. self-published<span class="reference-accessdate">. Retrieved <span class="nowrap">29 September</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Star+Tales&rft.atitle=Hydrus%E2%80%94the+Lesser+Water+Snake&rft.aulast=Ridpath&rft.aufirst=Ian&rft_id=http%3A%2F%2Fwww.ianridpath.com%2Fstartales%2Fhydrus.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRidpath" class="citation web cs1"><a href="/wiki/Ian_Ridpath" title="Ian Ridpath">Ridpath, Ian</a>. <a rel="nofollow" class="external text" href="http://www.ianridpath.com/startales/lacaille.html">"Lacaille's Southern Planisphere of 1756"</a>. <i>Star Tales</i>. self-published<span class="reference-accessdate">. Retrieved <span class="nowrap">29 September</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Star+Tales&rft.atitle=Lacaille%27s+Southern+Planisphere+of+1756&rft.aulast=Ridpath&rft.aufirst=Ian&rft_id=http%3A%2F%2Fwww.ianridpath.com%2Fstartales%2Flacaille.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-motz-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-motz_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-motz_7-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-motz_7-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-motz_7-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-motz_7-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-motz_7-5"><sup><i><b>f</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMotzNathanson,_Carol1991" class="citation book cs1">Motz, Lloyd; Nathanson, Carol (1991). <i>The Constellations: An Enthusiast's Guide to the Night Sky</i>. London, United Kingdom: Aurum Press. pp. 385, 391. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-85410-088-7" title="Special:BookSources/978-1-85410-088-7"><bdi>978-1-85410-088-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Constellations%3A+An+Enthusiast%27s+Guide+to+the+Night+Sky&rft.place=London%2C+United+Kingdom&rft.pages=385%2C+391&rft.pub=Aurum+Press&rft.date=1991&rft.isbn=978-1-85410-088-7&rft.aulast=Motz&rft.aufirst=Lloyd&rft.au=Nathanson%2C+Carol&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-bagnall251-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-bagnall251_8-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBagnall2012" class="citation book cs1">Bagnall, Philip M. (2012). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=KcIg02TKW6QC&pg=PA251"><i>The Star Atlas Companion: What You Need to Know about the Constellations</i></a>. New York City: Springer. p. 251. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4614-0830-7" title="Special:BookSources/978-1-4614-0830-7"><bdi>978-1-4614-0830-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Star+Atlas+Companion%3A+What+You+Need+to+Know+about+the+Constellations&rft.place=New+York+City&rft.pages=251&rft.pub=Springer&rft.date=2012&rft.isbn=978-1-4614-0830-7&rft.aulast=Bagnall&rft.aufirst=Philip+M.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DKcIg02TKW6QC%26pg%3DPA251&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-pa30_469-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-pa30_469_9-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRussell1922" class="citation journal cs1"><a href="/wiki/Henry_Norris_Russell" title="Henry Norris Russell">Russell, Henry Norris</a> (1922). "The New International Symbols for the Constellations". <i><a href="/wiki/Popular_Astronomy_(US_magazine)" title="Popular Astronomy (US magazine)">Popular Astronomy</a></i>. <b>30</b>: 469. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1922PA.....30..469R">1922PA.....30..469R</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Popular+Astronomy&rft.atitle=The+New+International+Symbols+for+the+Constellations&rft.volume=30&rft.pages=469&rft.date=1922&rft_id=info%3Abibcode%2F1922PA.....30..469R&rft.aulast=Russell&rft.aufirst=Henry+Norris&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFZimmerman1998" class="citation book cs1">Zimmerman, Brett (1998). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/hermanmelvillest0000zimm"><i>Herman Melville: Stargazer</i></a></span>. Montreal, Quebec: McGill-Queen's University Press. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/hermanmelvillest0000zimm/page/5">5</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7735-1786-8" title="Special:BookSources/978-0-7735-1786-8"><bdi>978-0-7735-1786-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Herman+Melville%3A+Stargazer&rft.place=Montreal%2C+Quebec&rft.pages=5&rft.pub=McGill-Queen%27s+University+Press&rft.date=1998&rft.isbn=978-0-7735-1786-8&rft.aulast=Zimmerman&rft.aufirst=Brett&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fhermanmelvillest0000zimm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-Stilwell_2010-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-Stilwell_2010_11-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFStilwell._Alexander2010" class="citation book cs1">Stilwell. 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London, United Kingdom: Amber Books. p. 201. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-908696-06-9" title="Special:BookSources/978-1-908696-06-9"><bdi>978-1-908696-06-9</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Crisis+Survival&rft.place=London%2C+United+Kingdom&rft.series=SAS+and+Elite+Forces+Survival+Guide&rft.pages=201&rft.pub=Amber+Books&rft.date=2010&rft.isbn=978-1-908696-06-9&rft.au=Stilwell.+Alexander&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DZKRfAu1xfOMC%26pg%3DPT201&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-hartungs-12"><span class="mw-cite-backlink">^ <a href="#cite_ref-hartungs_12-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-hartungs_12-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-hartungs_12-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-hartungs_12-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMalin,_DavidFrew,_David_J.1995" class="citation book cs1">Malin, David; Frew, David J. 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Cambridge, United Kingdom: Cambridge University Press. p. 259. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-55491-6" title="Special:BookSources/978-0-521-55491-6"><bdi>978-0-521-55491-6</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Hartung%27s+Astronomical+Objects+for+Southern+Telescopes%3A+A+Handbook+for+Amateur+Observers&rft.place=Cambridge%2C+United+Kingdom&rft.pages=259&rft.pub=Cambridge+University+Press&rft.date=1995&rft.isbn=978-0-521-55491-6&rft.au=Malin%2C+David&rft.au=Frew%2C+David+J.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DEQAYGmZT0o8C%26pg%3DPA259&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKnobel,_Edward_B.1917" class="citation journal cs1"><a href="/wiki/Edward_Knobel" title="Edward Knobel">Knobel, Edward B.</a> (1917). <a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnras%2F77.5.414">"On Frederick de Houtman's Catalogue of Southern Stars, and the Origin of the Southern Constellations"</a>. <i><a href="/wiki/Monthly_Notices_of_the_Royal_Astronomical_Society" title="Monthly Notices of the Royal Astronomical Society">Monthly Notices of the Royal Astronomical Society</a></i>. <b>77</b> (5): 414–32 [422]. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1917MNRAS..77..414K">1917MNRAS..77..414K</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnras%2F77.5.414">10.1093/mnras/77.5.414</a></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Monthly+Notices+of+the+Royal+Astronomical+Society&rft.atitle=On+Frederick+de+Houtman%27s+Catalogue+of+Southern+Stars%2C+and+the+Origin+of+the+Southern+Constellations&rft.volume=77&rft.issue=5&rft.pages=414-32+422&rft.date=1917&rft_id=info%3Adoi%2F10.1093%2Fmnras%2F77.5.414&rft_id=info%3Abibcode%2F1917MNRAS..77..414K&rft.au=Knobel%2C+Edward+B.&rft_id=https%3A%2F%2Fdoi.org%2F10.1093%252Fmnras%252F77.5.414&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-wagman-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-wagman_14-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWagman2003" class="citation book cs1">Wagman, Morton (2003). <i>Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others</i>. 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Cambridge, United Kingdom: Cambridge University Press. p. 57. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-48070-3" title="Special:BookSources/978-0-521-48070-3"><bdi>978-0-521-48070-3</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=The+Age+Distribution+of+Cloud+Clusters&rft.btitle=The+Magellanic+Clouds&rft.place=Cambridge%2C+United+Kingdom&rft.pages=57&rft.pub=Cambridge+University+Press&rft.date=1997&rft.isbn=978-0-521-48070-3&rft.aulast=Westerlund&rft.aufirst=Bengt+E.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DOSiPrgHFOYUC%26pg%3DPA57&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-44"><span class="mw-cite-backlink"><b><a href="#cite_ref-44">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBakich2010" class="citation book cs1">Bakich, Michael E. (2010). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=qEhpS7d5ZdAC&pg=PA373"><i>1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers</i></a>. New York City: Springer. p. 373. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-4419-1777-5" title="Special:BookSources/978-1-4419-1777-5"><bdi>978-1-4419-1777-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=1001+Celestial+Wonders+to+See+Before+You+Die%3A+The+Best+Sky+Objects+for+Star+Gazers&rft.place=New+York+City&rft.pages=373&rft.pub=Springer&rft.date=2010&rft.isbn=978-1-4419-1777-5&rft.aulast=Bakich&rft.aufirst=Michael+E.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DqEhpS7d5ZdAC%26pg%3DPA373&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> <li id="cite_note-cambridge-45"><span class="mw-cite-backlink"><b><a href="#cite_ref-cambridge_45-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMoore,_PatrickTirion,_Wil1997" class="citation book cs1">Moore, Patrick; Tirion, Wil (1997). <span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/cambridgeguideto00moor"><i>Cambridge Guide to Stars and Planets</i></a></span>. Cambridge, United Kingdom: Cambridge University Press. p. <a rel="nofollow" class="external text" href="https://archive.org/details/cambridgeguideto00moor/page/194">194</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-58582-8" title="Special:BookSources/978-0-521-58582-8"><bdi>978-0-521-58582-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Cambridge+Guide+to+Stars+and+Planets&rft.place=Cambridge%2C+United+Kingdom&rft.pages=194&rft.pub=Cambridge+University+Press&rft.date=1997&rft.isbn=978-0-521-58582-8&rft.au=Moore%2C+Patrick&rft.au=Tirion%2C+Wil&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fcambridgeguideto00moor&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHydrus" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hydrus&action=edit&section=8" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output 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srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <a href="https://commons.wikimedia.org/wiki/Hydrus" class="extiw" title="commons:Hydrus"><span style="font-style:italic; font-weight:bold;">Hydrus</span></a>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="http://chandra.harvard.edu/photo/constellations/hydrus.html">Chandra information about Hydrus</a></li> <li><a rel="nofollow" class="external text" href="http://www.allthesky.com/constellations/hydrus/constell.html">The Deep Photographic Guide to the Constellations: Hydrus</a></li> <li><a rel="nofollow" class="external text" href="http://astrojan.nhely.hu/hydrus.htm">The clickable Hydrus</a></li></ul> <div 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href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Hydrus" title="Template:Hydrus"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Hydrus" title="Template talk:Hydrus"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Hydrus" title="Special:EditPage/Template:Hydrus"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Constellation_of_Hydrus" style="font-size:114%;margin:0 4em"><a href="/wiki/Hydrus_(constellation)" class="mw-redirect" title="Hydrus (constellation)">Constellation of Hydrus</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: center;"><div> <ul><li><a href="/wiki/List_of_stars_in_Hydrus" title="List of stars in Hydrus">List of stars in Hydrus</a></li> <li><a href="/wiki/Hydrus_in_Chinese_astronomy" title="Hydrus in Chinese astronomy">Hydrus in Chinese astronomy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:55px"><a href="/wiki/Star" title="Star">Stars</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/Bayer_designation" title="Bayer designation">Bayer</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alpha_Hydri" title="Alpha Hydri">α</a></li> <li><a href="/wiki/Beta_Hydri" title="Beta Hydri">β</a></li> <li><a href="/wiki/Gamma_Hydri" title="Gamma Hydri">γ</a></li> <li><a href="/wiki/Delta_Hydri" title="Delta Hydri">δ</a></li> <li><a href="/wiki/Epsilon_Hydri" title="Epsilon Hydri">ε</a></li> <li><a href="/wiki/Zeta_Hydri" title="Zeta Hydri">ζ</a></li> <li><a href="/wiki/Eta1_Hydri" title="Eta1 Hydri">η<sup>1</sup></a></li> <li><a href="/wiki/Eta2_Hydri" title="Eta2 Hydri">η<sup>2</sup></a></li> <li><a href="/wiki/Theta_Hydri" title="Theta Hydri">θ</a></li> <li><a href="/wiki/Iota_Hydri" class="mw-redirect" title="Iota Hydri">ι</a></li> <li><a href="/wiki/Kappa_Hydri" class="mw-redirect" title="Kappa Hydri">κ</a></li> <li><a href="/wiki/Lambda_Hydri" class="mw-redirect" title="Lambda Hydri">λ</a></li> <li><a href="/wiki/Mu_Hydri" class="mw-redirect" title="Mu Hydri">μ</a></li> <li><a href="/wiki/Nu_Hydri" title="Nu Hydri">ν</a></li> <li><a href="/wiki/Pi1_Hydri" class="mw-redirect" title="Pi1 Hydri">π<sup>1</sup></a></li> <li><a href="/wiki/Pi2_Hydri" class="mw-redirect" title="Pi2 Hydri">π<sup>2</sup></a></li> <li><a href="/wiki/Sigma_Hydri" class="mw-redirect" title="Sigma Hydri">σ</a></li> <li><a href="/wiki/Tau1_Hydri" class="mw-redirect" title="Tau1 Hydri">τ<sup>1</sup></a></li> <li><a href="/wiki/Tau2_Hydri" class="mw-redirect" title="Tau2 Hydri">τ<sup>2</sup></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/Variable_star_designation" class="mw-redirect" title="Variable star designation">Variable</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/VW_Hydri" title="VW Hydri">VW</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/Henry_Draper_Catalogue" title="Henry Draper Catalogue">HD</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/HD_1237" title="HD 1237">1237</a></li> <li><a href="/wiki/HD_10180" title="HD 10180">10180</a></li> <li><a href="/wiki/HD_20003" title="HD 20003">20003</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AB8_(star)" title="AB8 (star)">AB8</a></li> <li><a href="/wiki/SMSS_J031300.36%E2%88%92670839.3" title="SMSS J031300.36−670839.3">SMSS J0313−6708</a></li> <li><a href="/wiki/WISEPC_J014807.25%E2%88%92720258.7" class="mw-redirect" title="WISEPC J014807.25−720258.7">WISEPC J014807.25−720258.7</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Exoplanets" scope="row" class="navbox-group" style="width:151px;background: #ddddff;"><a href="/wiki/Exoplanet" title="Exoplanet">Exoplanets</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Eta2_Hydri_b" title="Eta2 Hydri b">η<sup>2</sup> Hydri b</a></li> <li><a href="/wiki/GJ_3021_b" title="GJ 3021 b">GJ 3021 b</a></li> <li><a href="/wiki/HD_10180_c" title="HD 10180 c">HD 10180 c</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Star_clusters" scope="row" class="navbox-group" style="width:151px;background: #ddddff;"><a href="/wiki/Star_cluster" title="Star cluster">Star clusters</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NGC_602" title="NGC 602">NGC 602</a></li> <li><a href="/wiki/NGC_643" title="NGC 643">NGC 643</a></li> <li><a href="/wiki/NGC_1466" title="NGC 1466">NGC 1466</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="text-align: center;;width:55px"><a href="/wiki/Galaxy" title="Galaxy">Galaxies</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/New_General_Catalogue" title="New General Catalogue">NGC</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NGC_646" title="NGC 646">646</a></li> <li><a href="/wiki/NGC_802" title="NGC 802">802</a></li> <li><a href="/wiki/NGC_813" title="NGC 813">813</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/KKs_3" title="KKs 3">KKs 3</a></li> <li><a href="/wiki/PGC_6240" title="PGC 6240">PGC 6240</a></li> <li><a href="/wiki/Small_Magellanic_Cloud" title="Small Magellanic Cloud">Small Magellanic Cloud</a> (mostly in <a href="/wiki/Tucana" title="Tucana">Tucana</a>)</li> <li><a href="/wiki/Large_Magellanic_Cloud" title="Large Magellanic Cloud">Large Magellanic Cloud</a> (mostly in <a href="/wiki/Dorado" title="Dorado">Dorado</a>, partly in <a href="/wiki/Mensa_(constellation)" title="Mensa (constellation)">Mensa</a>)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="text-align: center;"><div><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Hydrus" title="Category:Hydrus">Category</a></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="The_88_modern_constellations" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Constellations/modern" title="Template:Constellations/modern"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Constellations/modern" title="Template talk:Constellations/modern"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Constellations/modern" title="Special:EditPage/Template:Constellations/modern"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="The_88_modern_constellations" style="font-size:114%;margin:0 4em">The <a href="/wiki/IAU_designated_constellations" title="IAU designated constellations">88 modern constellations</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Andromeda_(constellation)" title="Andromeda (constellation)">Andromeda</a></li> <li><a href="/wiki/Antlia" title="Antlia">Antlia</a></li> <li><a href="/wiki/Apus" title="Apus">Apus</a></li> <li><a href="/wiki/Aquarius_(constellation)" title="Aquarius (constellation)">Aquarius</a></li> <li><a href="/wiki/Aquila_(constellation)" title="Aquila (constellation)">Aquila</a></li> <li><a href="/wiki/Ara_(constellation)" title="Ara (constellation)">Ara</a></li> <li><a href="/wiki/Aries_(constellation)" title="Aries (constellation)">Aries</a></li> <li><a href="/wiki/Auriga" title="Auriga">Auriga</a></li> <li><a href="/wiki/Bo%C3%B6tes" title="Boötes">Boötes</a></li> <li><a href="/wiki/Caelum" title="Caelum">Caelum</a></li> <li><a href="/wiki/Camelopardalis" title="Camelopardalis">Camelopardalis</a></li> <li><a href="/wiki/Cancer_(constellation)" title="Cancer (constellation)">Cancer</a></li> <li><a href="/wiki/Canes_Venatici" title="Canes Venatici">Canes Venatici</a></li> <li><a href="/wiki/Canis_Major" title="Canis Major">Canis Major</a></li> <li><a href="/wiki/Canis_Minor" title="Canis Minor">Canis Minor</a></li> <li><a href="/wiki/Capricornus" title="Capricornus">Capricornus</a></li> <li><a href="/wiki/Carina_(constellation)" title="Carina (constellation)">Carina</a></li> <li><a href="/wiki/Cassiopeia_(constellation)" title="Cassiopeia (constellation)">Cassiopeia</a></li> <li><a href="/wiki/Centaurus" title="Centaurus">Centaurus</a></li> <li><a href="/wiki/Cepheus_(constellation)" title="Cepheus (constellation)">Cepheus</a></li> <li><a href="/wiki/Cetus" title="Cetus">Cetus</a></li> <li><a href="/wiki/Chamaeleon" title="Chamaeleon">Chamaeleon</a></li> <li><a href="/wiki/Circinus" title="Circinus">Circinus</a></li> <li><a href="/wiki/Columba_(constellation)" title="Columba (constellation)">Columba</a></li> <li><a href="/wiki/Coma_Berenices" title="Coma Berenices">Coma Berenices</a></li> <li><a href="/wiki/Corona_Australis" title="Corona Australis">Corona Australis</a></li> <li><a href="/wiki/Corona_Borealis" title="Corona Borealis">Corona Borealis</a></li> <li><a href="/wiki/Corvus_(constellation)" title="Corvus (constellation)">Corvus</a></li> <li><a href="/wiki/Crater_(constellation)" title="Crater (constellation)">Crater</a></li> <li><a href="/wiki/Crux" title="Crux">Crux</a></li> <li><a href="/wiki/Cygnus_(constellation)" title="Cygnus (constellation)">Cygnus</a></li> <li><a href="/wiki/Delphinus" title="Delphinus">Delphinus</a></li> <li><a href="/wiki/Dorado" title="Dorado">Dorado</a></li> <li><a href="/wiki/Draco_(constellation)" title="Draco (constellation)">Draco</a></li> <li><a href="/wiki/Equuleus" title="Equuleus">Equuleus</a></li> <li><a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a></li> <li><a href="/wiki/Fornax" title="Fornax">Fornax</a></li> <li><a href="/wiki/Gemini_(constellation)" title="Gemini (constellation)">Gemini</a></li> <li><a href="/wiki/Grus_(constellation)" title="Grus (constellation)">Grus</a></li> <li><a href="/wiki/Hercules_(constellation)" title="Hercules (constellation)">Hercules</a></li> <li><a href="/wiki/Horologium_(constellation)" title="Horologium (constellation)">Horologium</a></li> <li><a href="/wiki/Hydra_(constellation)" title="Hydra (constellation)">Hydra</a></li> <li><a class="mw-selflink selflink">Hydrus</a></li> <li><a href="/wiki/Indus_(constellation)" title="Indus (constellation)">Indus</a></li> <li><a href="/wiki/Lacerta" title="Lacerta">Lacerta</a></li> <li><a href="/wiki/Leo_(constellation)" title="Leo (constellation)">Leo</a></li> <li><a href="/wiki/Leo_Minor" title="Leo Minor">Leo Minor</a></li> <li><a href="/wiki/Lepus_(constellation)" title="Lepus (constellation)">Lepus</a></li> <li><a href="/wiki/Libra_(constellation)" title="Libra (constellation)">Libra</a></li> <li><a href="/wiki/Lupus_(constellation)" title="Lupus (constellation)">Lupus</a></li> <li><a href="/wiki/Lynx_(constellation)" title="Lynx (constellation)">Lynx</a></li> <li><a href="/wiki/Lyra" title="Lyra">Lyra</a></li> <li><a href="/wiki/Mensa_(constellation)" title="Mensa (constellation)">Mensa</a></li> <li><a href="/wiki/Microscopium" title="Microscopium">Microscopium</a></li> <li><a href="/wiki/Monoceros" title="Monoceros">Monoceros</a></li> <li><a href="/wiki/Musca" title="Musca">Musca</a></li> <li><a href="/wiki/Norma_(constellation)" title="Norma (constellation)">Norma</a></li> <li><a href="/wiki/Octans" title="Octans">Octans</a></li> <li><a href="/wiki/Ophiuchus" title="Ophiuchus">Ophiuchus</a></li> <li><a href="/wiki/Orion_(constellation)" title="Orion (constellation)">Orion</a></li> <li><a href="/wiki/Pavo_(constellation)" title="Pavo (constellation)">Pavo</a></li> <li><a href="/wiki/Pegasus_(constellation)" title="Pegasus (constellation)">Pegasus</a></li> <li><a href="/wiki/Perseus_(constellation)" title="Perseus (constellation)">Perseus</a></li> <li><a href="/wiki/Phoenix_(constellation)" title="Phoenix (constellation)">Phoenix</a></li> <li><a href="/wiki/Pictor" title="Pictor">Pictor</a></li> <li><a href="/wiki/Pisces_(constellation)" title="Pisces (constellation)">Pisces</a></li> <li><a href="/wiki/Piscis_Austrinus" title="Piscis Austrinus">Piscis Austrinus</a></li> <li><a href="/wiki/Puppis" title="Puppis">Puppis</a></li> <li><a href="/wiki/Pyxis" title="Pyxis">Pyxis</a></li> <li><a href="/wiki/Reticulum" title="Reticulum">Reticulum</a></li> <li><a href="/wiki/Sagitta" title="Sagitta">Sagitta</a></li> <li><a href="/wiki/Sagittarius_(constellation)" title="Sagittarius (constellation)">Sagittarius</a></li> <li><a href="/wiki/Scorpius" title="Scorpius">Scorpius</a></li> <li><a href="/wiki/Sculptor_(constellation)" title="Sculptor (constellation)">Sculptor</a></li> <li><a href="/wiki/Scutum_(constellation)" title="Scutum (constellation)">Scutum</a></li> <li><a href="/wiki/Serpens" title="Serpens">Serpens</a></li> <li><a href="/wiki/Sextans" title="Sextans">Sextans</a></li> <li><a href="/wiki/Taurus_(constellation)" title="Taurus (constellation)">Taurus</a></li> <li><a href="/wiki/Telescopium" title="Telescopium">Telescopium</a></li> <li><a href="/wiki/Triangulum" title="Triangulum">Triangulum</a></li> <li><a href="/wiki/Triangulum_Australe" title="Triangulum Australe">Triangulum Australe</a></li> <li><a href="/wiki/Tucana" title="Tucana">Tucana</a></li> <li><a href="/wiki/Ursa_Major" title="Ursa Major">Ursa Major</a></li> <li><a href="/wiki/Ursa_Minor" title="Ursa Minor">Ursa Minor</a></li> <li><a href="/wiki/Vela_(constellation)" title="Vela (constellation)">Vela</a></li> <li><a href="/wiki/Virgo_(constellation)" title="Virgo (constellation)">Virgo</a></li> <li><a href="/wiki/Volans" title="Volans">Volans</a></li> <li><a href="/wiki/Vulpecula" title="Vulpecula">Vulpecula</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Lists_of_constellations" title="Lists of constellations">Lists of constellations</a></li></ul> </div></td></tr></tbody></table></div><div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"></div><div role="navigation" class="navbox" aria-labelledby="Constellation_history" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Constellations/historic" title="Template:Constellations/historic"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Constellations/historic" title="Template talk:Constellations/historic"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Constellations/historic" title="Special:EditPage/Template:Constellations/historic"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Constellation_history" style="font-size:114%;margin:0 4em">Constellation history</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks hlist mw-collapsible autocollapse navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background: #ddf;"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Constellations/historic/ptolemaic" title="Template:Constellations/historic/ptolemaic"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Constellations/historic/ptolemaic" title="Template talk:Constellations/historic/ptolemaic"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Constellations/historic/ptolemaic" title="Special:EditPage/Template:Constellations/historic/ptolemaic"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="48_constellations_listed_by_Ptolemy_after_150_AD" style="font-size:114%;margin:0 4em">48 constellations listed by <a href="/wiki/Ptolemy" title="Ptolemy">Ptolemy</a> after 150 AD</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Andromeda_(constellation)" title="Andromeda (constellation)">Andromeda</a></li> <li><a href="/wiki/Aquarius_(constellation)" title="Aquarius (constellation)">Aquarius</a></li> <li><a href="/wiki/Aquila_(constellation)" title="Aquila (constellation)">Aquila</a></li> <li><a href="/wiki/Ara_(constellation)" title="Ara (constellation)">Ara</a></li> <li><a href="/wiki/Argo_Navis" title="Argo Navis">Argo Navis</a></li> <li><a href="/wiki/Aries_(constellation)" title="Aries (constellation)">Aries</a></li> <li><a href="/wiki/Auriga" title="Auriga">Auriga</a></li> <li><a href="/wiki/Bo%C3%B6tes" title="Boötes">Boötes</a></li> <li><a href="/wiki/Cancer_(constellation)" title="Cancer (constellation)">Cancer</a></li> <li><a href="/wiki/Canis_Major" title="Canis Major">Canis Major</a></li> <li><a href="/wiki/Canis_Minor" title="Canis Minor">Canis Minor</a></li> <li><a href="/wiki/Capricornus" title="Capricornus">Capricornus</a></li> <li><a href="/wiki/Cassiopeia_(constellation)" title="Cassiopeia (constellation)">Cassiopeia</a></li> <li><a href="/wiki/Centaurus" title="Centaurus">Centaurus</a></li> <li><a href="/wiki/Cepheus_(constellation)" title="Cepheus (constellation)">Cepheus</a></li> <li><a href="/wiki/Cetus" title="Cetus">Cetus</a></li> <li><a href="/wiki/Corona_Australis" title="Corona Australis">Corona Australis</a></li> <li><a href="/wiki/Corona_Borealis" title="Corona Borealis">Corona Borealis</a></li> <li><a href="/wiki/Corvus_(constellation)" title="Corvus (constellation)">Corvus</a></li> <li><a href="/wiki/Crater_(constellation)" title="Crater (constellation)">Crater</a></li> <li><a href="/wiki/Cygnus_(constellation)" title="Cygnus (constellation)">Cygnus</a></li> <li><a href="/wiki/Delphinus" title="Delphinus">Delphinus</a></li> <li><a href="/wiki/Draco_(constellation)" title="Draco (constellation)">Draco</a></li> <li><a href="/wiki/Equuleus" title="Equuleus">Equuleus</a></li> <li><a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a></li> <li><a href="/wiki/Gemini_(constellation)" title="Gemini (constellation)">Gemini</a></li> <li><a href="/wiki/Hercules_(constellation)" title="Hercules (constellation)">Hercules</a></li> <li><a href="/wiki/Hydra_(constellation)" title="Hydra (constellation)">Hydra</a></li> <li><a href="/wiki/Leo_(constellation)" title="Leo (constellation)">Leo</a></li> <li><a href="/wiki/Lepus_(constellation)" title="Lepus (constellation)">Lepus</a></li> <li><a href="/wiki/Libra_(constellation)" title="Libra (constellation)">Libra</a></li> <li><a href="/wiki/Lupus_(constellation)" title="Lupus (constellation)">Lupus</a></li> <li><a href="/wiki/Lyra" title="Lyra">Lyra</a></li> <li><a href="/wiki/Ophiuchus" title="Ophiuchus">Ophiuchus</a></li> <li><a href="/wiki/Orion_(constellation)" title="Orion (constellation)">Orion</a></li> <li><a href="/wiki/Pegasus_(constellation)" title="Pegasus (constellation)">Pegasus</a></li> <li><a href="/wiki/Perseus_(constellation)" title="Perseus (constellation)">Perseus</a></li> <li><a href="/wiki/Pisces_(constellation)" title="Pisces (constellation)">Pisces</a></li> <li><a href="/wiki/Piscis_Austrinus" title="Piscis Austrinus">Piscis Austrinus</a></li> <li><a href="/wiki/Sagitta" title="Sagitta">Sagitta</a></li> <li><a href="/wiki/Sagittarius_(constellation)" title="Sagittarius (constellation)">Sagittarius</a></li> <li><a href="/wiki/Scorpius" title="Scorpius">Scorpius</a></li> <li><a href="/wiki/Serpens" title="Serpens">Serpens</a></li> <li><a href="/wiki/Taurus_(constellation)" title="Taurus (constellation)">Taurus</a></li> <li><a href="/wiki/Triangulum" title="Triangulum">Triangulum</a></li> <li><a href="/wiki/Ursa_Major" title="Ursa Major">Ursa Major</a></li> <li><a href="/wiki/Ursa_Minor" title="Ursa Minor">Ursa Minor</a></li> <li><a href="/wiki/Virgo_(constellation)" title="Virgo (constellation)">Virgo</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background:#ffe"><div><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Constellations_listed_by_Ptolemy" title="Category:Constellations listed by Ptolemy">Category</a></div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background: #ddf;"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Constellations/historic/modern" title="Template:Constellations/historic/modern"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Constellations/historic/modern" title="Template talk:Constellations/historic/modern"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Constellations/historic/modern" title="Special:EditPage/Template:Constellations/historic/modern"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="The_41_additional_constellations_added_in_the_16th,_17th_and_18th_centuries" style="font-size:114%;margin:0 4em">The 41 additional constellations added in the 16th, 17th and 18th centuries</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i>Vespucci or Corsalius early 16c</i>: <a href="/wiki/Crux" title="Crux">Crux</a></li> <li><a href="/wiki/Triangulum_Australe" title="Triangulum Australe">Triangulum Australe</a></li> <li><i>Vopel</i> 1536: <a href="/wiki/Coma_Berenices" title="Coma Berenices">Coma Berenices</a></li> <li><i>Keyser & de Houtman</i> 1596: <a href="/wiki/Apus" title="Apus">Apus</a></li> <li><a href="/wiki/Chamaeleon" title="Chamaeleon">Chamaeleon</a></li> <li><a href="/wiki/Dorado" title="Dorado">Dorado</a></li> <li><a href="/wiki/Grus_(constellation)" title="Grus (constellation)">Grus</a></li> <li><a class="mw-selflink selflink">Hydrus</a></li> <li><a href="/wiki/Indus_(constellation)" title="Indus (constellation)">Indus</a></li> <li><a href="/wiki/Musca" title="Musca">Musca</a></li> <li><a href="/wiki/Pavo_(constellation)" title="Pavo (constellation)">Pavo</a></li> <li><a href="/wiki/Phoenix_(constellation)" title="Phoenix (constellation)">Phoenix</a></li> <li><a href="/wiki/Tucana" title="Tucana">Tucana</a></li> <li><a href="/wiki/Volans" title="Volans">Volans</a></li> <li><i>Plancius</i> 1613: <a href="/wiki/Camelopardalis" title="Camelopardalis">Camelopardalis</a></li> <li><a href="/wiki/Columba_(constellation)" title="Columba (constellation)">Columba</a></li> <li><a href="/wiki/Monoceros" title="Monoceros">Monoceros</a></li> <li><i>Habrecht</i> 1621: <a href="/wiki/Reticulum" title="Reticulum">Reticulum</a></li> <li><i>Hevelius</i> 1683: <a href="/wiki/Canes_Venatici" title="Canes Venatici">Canes Venatici</a></li> <li><a href="/wiki/Lacerta" title="Lacerta">Lacerta</a></li> <li><a href="/wiki/Leo_Minor" title="Leo Minor">Leo Minor</a></li> <li><a href="/wiki/Lynx_(constellation)" title="Lynx (constellation)">Lynx</a></li> <li><a href="/wiki/Scutum_(constellation)" title="Scutum (constellation)">Scutum</a></li> <li><a href="/wiki/Sextans" title="Sextans">Sextans</a></li> <li><a href="/wiki/Vulpecula" title="Vulpecula">Vulpecula</a></li> <li><i>de Lacaille</i> 1763: <a href="/wiki/Antlia" title="Antlia">Antlia</a></li> <li><a href="/wiki/Caelum" title="Caelum">Caelum</a></li> <li><a href="/wiki/Carina_(constellation)" title="Carina (constellation)">Carina</a></li> <li><a href="/wiki/Circinus" title="Circinus">Circinus</a></li> <li><a href="/wiki/Fornax" title="Fornax">Fornax</a></li> <li><a href="/wiki/Horologium_(constellation)" title="Horologium (constellation)">Horologium</a></li> <li><a href="/wiki/Mensa_(constellation)" title="Mensa (constellation)">Mensa</a></li> <li><a href="/wiki/Microscopium" title="Microscopium">Microscopium</a></li> <li><a href="/wiki/Norma_(constellation)" title="Norma (constellation)">Norma</a></li> <li><a href="/wiki/Octans" title="Octans">Octans</a></li> <li><a href="/wiki/Pictor" title="Pictor">Pictor</a></li> <li><a href="/wiki/Puppis" title="Puppis">Puppis</a></li> <li><a href="/wiki/Pyxis" title="Pyxis">Pyxis</a></li> <li><a href="/wiki/Sculptor_(constellation)" title="Sculptor (constellation)">Sculptor</a></li> <li><a href="/wiki/Telescopium" title="Telescopium">Telescopium</a></li> <li><a href="/wiki/Vela_(constellation)" title="Vela (constellation)">Vela</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background: #ddf;"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Constellations/historic/obsolete" title="Template:Constellations/historic/obsolete"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Constellations/historic/obsolete" title="Template talk:Constellations/historic/obsolete"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Constellations/historic/obsolete" title="Special:EditPage/Template:Constellations/historic/obsolete"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Obsolete_constellations_(including_Ptolemy&#039;s_Argo_Navis)" style="font-size:114%;margin:0 4em"><a href="/wiki/Former_constellations" title="Former constellations">Obsolete constellations</a> (including Ptolemy's Argo Navis)</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Anguilla_(constellation)" class="mw-redirect" title="Anguilla (constellation)">Anguilla</a></li> <li><a href="/wiki/Anser_(constellation)" class="mw-redirect" title="Anser (constellation)">Anser</a></li> <li><a href="/wiki/Antinous_(constellation)" title="Antinous (constellation)">Antinous</a></li> <li><a href="/wiki/Apes_(constellation)" class="mw-redirect" title="Apes (constellation)">Apes</a></li> <li><a href="/wiki/Aranea_(constellation)" class="mw-redirect" title="Aranea (constellation)">Aranea</a></li> <li><a href="/wiki/Argo_Navis" title="Argo Navis">Argo Navis</a></li> <li><a href="/wiki/Asterion_(constellation)" class="mw-redirect" title="Asterion (constellation)">Asterion</a></li> <li><a href="/wiki/Bufo_(constellation)" class="mw-redirect" title="Bufo (constellation)">Bufo</a></li> <li><a href="/wiki/Cancer_Minor" title="Cancer Minor">Cancer Minor</a></li> <li><a href="/wiki/Cerberus_(constellation)" title="Cerberus (constellation)">Cerberus</a></li> <li><a href="/wiki/Chara_(constellation)" class="mw-redirect" title="Chara (constellation)">Chara</a></li> <li><a href="/wiki/Custos_Messium" title="Custos Messium">Custos Messium</a></li> <li><a href="/wiki/Felis_(constellation)" title="Felis (constellation)">Felis</a></li> <li><a href="/wiki/Honores_Friderici" title="Honores Friderici">Honores Friderici/Gloria Frederici</a></li> <li><a href="/wiki/Gallus_(constellation)" title="Gallus (constellation)">Gallus</a></li> <li><a href="/wiki/Globus_Aerostaticus" title="Globus Aerostaticus">Globus Aerostaticus</a></li> <li><a href="/wiki/Hippocampus_(constellation)" class="mw-redirect" title="Hippocampus (constellation)">Hippocampus</a></li> <li><a href="/wiki/Hirudo_(constellation)" class="mw-redirect" title="Hirudo (constellation)">Hirudo</a></li> <li><a href="/wiki/Jordanus_(constellation)" title="Jordanus (constellation)">Jordanus</a></li> <li><a href="/wiki/Leo_Palatinus" title="Leo Palatinus">Leo Palatinus</a></li> <li><a href="/wiki/Lilium_(constellation)" class="mw-redirect" title="Lilium (constellation)">Lilium</a></li> <li><a href="/w/index.php?title=Limax_(constellation)&action=edit&redlink=1" class="new" title="Limax (constellation) (page does not exist)">Limax</a></li> <li><a href="/wiki/Lochium_Funis" title="Lochium Funis">Lochium Funis</a></li> <li><a href="/w/index.php?title=Lumbricus_(constellation)&action=edit&redlink=1" class="new" title="Lumbricus (constellation) (page does not exist)">Lumbricus</a></li> <li><a href="/wiki/Machina_Electrica" title="Machina Electrica">Machina Electrica</a></li> <li><a href="/wiki/Malus_(constellation)" title="Malus (constellation)">Malus</a></li> <li><a href="/w/index.php?title=Manis_(constellation)&action=edit&redlink=1" class="new" title="Manis (constellation) (page does not exist)">Manis</a></li> <li><a href="/wiki/Mons_Maenalus" title="Mons Maenalus">Mons Maenalus</a></li> <li><a href="/wiki/Musca_Borealis" title="Musca Borealis">Musca Borealis</a></li> <li><a href="/wiki/Noctua_(constellation)" title="Noctua (constellation)">Noctua</a></li> <li><a href="/wiki/Officina_Typographica" title="Officina Typographica">Officina Typographica</a></li> <li><a href="/w/index.php?title=Patella_(constellation)&action=edit&redlink=1" class="new" title="Patella (constellation) (page does not exist)">Patella</a></li> <li><a href="/w/index.php?title=Phaethon_(constellation)&action=edit&redlink=1" class="new" title="Phaethon (constellation) (page does not exist)">Phaethon</a></li> <li><a href="/wiki/Polophylax" title="Polophylax">Polophylax</a></li> <li><a href="/wiki/Psalterium_Georgii" title="Psalterium Georgii">Psalterium Georgianum/Harpa Georgii</a></li> <li><a href="/wiki/Quadrans_Muralis" title="Quadrans Muralis">Quadrans Muralis</a></li> <li><a href="/wiki/Ramus_Pomifer" title="Ramus Pomifer">Ramus Pomifer</a></li> <li><a href="/wiki/Robur_Carolinum" title="Robur Carolinum">Robur Carolinum</a></li> <li><a href="/w/index.php?title=Rosa_(constellation)&action=edit&redlink=1" class="new" title="Rosa (constellation) (page does not exist)">Rosa</a></li> <li><a href="/w/index.php?title=Scarabaeus_(constellation)&action=edit&redlink=1" class="new" title="Scarabaeus (constellation) (page does not exist)">Scarabaeus</a></li> <li><a href="/wiki/Sceptrum_Brandenburgicum" title="Sceptrum Brandenburgicum">Sceptrum Brandenburgicum</a></li> <li><a href="/wiki/Sceptrum_et_Manus_Iustitiae" title="Sceptrum et Manus Iustitiae">Sceptrum et Manus Iustitiae</a></li> <li><a href="/wiki/Solarium_(constellation)" title="Solarium (constellation)">Solarium</a></li> <li><a href="/wiki/Rangifer_(constellation)" title="Rangifer (constellation)">Tarandus/Rangifer</a></li> <li><a href="/wiki/Taurus_Poniatovii" title="Taurus Poniatovii">Taurus Poniatovii</a></li> <li><a href="/wiki/Telescopium_Herschelii" title="Telescopium Herschelii">Telescopium Herschelii</a></li> <li><a href="/wiki/Pisces_(constellation)#History_and_Mythology" title="Pisces (constellation)">Testudo</a></li> <li><a href="/wiki/River_Tigris_(constellation)" title="River Tigris (constellation)">Tigris</a></li> <li><a href="/wiki/Triangulum_Minus" title="Triangulum Minus">Triangulum Minus</a></li> <li><a href="/wiki/Turdus_Solitarius" title="Turdus Solitarius">Turdus Solitarius</a></li> <li><a href="/wiki/Vespa_(constellation)" class="mw-redirect" title="Vespa (constellation)">Vespa</a></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-even" style="width:100%;padding:0;background: #ddf;"><div style="padding:0 0.25em"> <ul><li><i><b>obsolete constellation names</b></i></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Musca#History" title="Musca">Apis</a></li> <li><a href="/wiki/Grus_(constellation)" title="Grus (constellation)">Phoenicopterus</a></li> <li><a href="/wiki/Ophiuchus" title="Ophiuchus">Serpentarius</a></li> <li><a href="/wiki/Dorado" title="Dorado">Xiphias</a></li> <li><a href="/wiki/Lyra" title="Lyra">Vultur cadens</a></li> <li><a href="/wiki/Aquila_(constellation)#History" title="Aquila (constellation)">Vultur volans</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table></div> <style data-mw-deduplicate="TemplateStyles:r1130092004">.mw-parser-output .portal-bar{font-size:88%;font-weight:bold;display:flex;justify-content:center;align-items:baseline}.mw-parser-output .portal-bar-bordered{padding:0 2em;background-color:#fdfdfd;border:1px solid #a2a9b1;clear:both;margin:1em auto 0}.mw-parser-output .portal-bar-related{font-size:100%;justify-content:flex-start}.mw-parser-output .portal-bar-unbordered{padding:0 1.7em;margin-left:0}.mw-parser-output .portal-bar-header{margin:0 1em 0 0.5em;flex:0 0 auto;min-height:24px}.mw-parser-output .portal-bar-content{display:flex;flex-flow:row wrap;flex:0 1 auto;padding:0.15em 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