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Available in 11 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-11" 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">11 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Upsilon4_Eridani" title="Upsilon4 Eridani – French" lang="fr" hreflang="fr" data-title="Upsilon4 Eridani" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Upsilon4_Eridani" title="Upsilon4 Eridani – Indonesian" lang="id" hreflang="id" data-title="Upsilon4 Eridani" 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-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Upsilon4_Eridani" title="Upsilon4 Eridani – Italian" lang="it" hreflang="it" data-title="Upsilon4 Eridani" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ce mw-list-item"><a href="https://ce.wikipedia.org/wiki/HD27376" title="HD27376 – Chechen" lang="ce" hreflang="ce" data-title="HD27376" data-language-autonym="Нохчийн" data-language-local-name="Chechen" class="interlanguage-link-target"><span>Нохчийн</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a 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mw-list-item"><a href="https://tt.wikipedia.org/wiki/HD27376" title="HD27376 – Tatar" lang="tt" hreflang="tt" data-title="HD27376" data-language-autonym="Татарча / tatarça" data-language-local-name="Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Upsilon4_Eridani" title="Upsilon4 Eridani – Turkish" lang="tr" hreflang="tr" data-title="Upsilon4 Eridani" 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/HD27376" title="HD27376 – Ukrainian" lang="uk" hreflang="uk" data-title="HD27376" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a 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<div class="mw-indicators"> </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"><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 star systems with this <a href="/wiki/Bayer_designation" title="Bayer designation">Bayer designation</a>, see <a href="/wiki/Upsilon_Eridani" title="Upsilon Eridani">Upsilon Eridani</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Star in the constellation Eridanus</div> <table class="infobox" style="width: 22em; font-size: 88%; line-height: 1.5em"> <caption style="font-size: 125%; font-weight: bold">Upsilon<sup>4</sup> Eridani </caption><tbody><tr><td colspan="2" style="text-align:center;"><div style="text-align: center; margin-left:auto; margin-right:auto"><div class="center"> <div class="floatnone"> <div style="width:260px;"> <div style="position:relative; background-color:#FFFFFF; ;"><span typeof="mw:File"><a href="/wiki/File:Caelum_constellation_map.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Caelum_constellation_map.png/260px-Caelum_constellation_map.png" decoding="async" width="260" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Caelum_constellation_map.png/390px-Caelum_constellation_map.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Caelum_constellation_map.png/520px-Caelum_constellation_map.png 2x" data-file-width="2559" data-file-height="2269" /></a></span><div style="position: absolute; z-index: 2; height: 0; width: 0; margin: 0; padding: 0; top: 78px; left: 190px;"> <div style="position: relative; z-index: 3; line-height: 0; text-align: center; width: 10px; left: -5px; top: -5px;"><span typeof="mw:File"><a href="/wiki/File:Red_circle.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Red_circle.svg/10px-Red_circle.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Red_circle.svg/15px-Red_circle.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/05/Red_circle.svg/20px-Red_circle.svg.png 2x" data-file-width="200" data-file-height="200" /></a></span></div><div style="position: relative; z-index: 4; font-size: 90%; line-height: 111%; width: 6em; top: -1.5em; left: 0.5em; text-align: left;"><span style="padding: 1px;"></span></div> </div></div> </div> </div> </div>Location of Upsilon<sup>4</sup> in Eridanus (circled)</div></td></tr> <tr> <th style="text-align: center; background-color: #FFFFC0;" colspan="2">Observation data<br /><a href="/wiki/Epoch_(astronomy)" title="Epoch (astronomy)">Epoch</a> <a href="/wiki/J2000.0" class="mw-redirect" title="J2000.0">J2000.0</a>      <a href="/wiki/Equinox_(celestial_coordinates)" title="Equinox (celestial coordinates)">Equinox</a> <a href="/wiki/J2000.0" class="mw-redirect" title="J2000.0">J2000.0</a> (<a href="/wiki/International_Celestial_Reference_System" class="mw-redirect" title="International Celestial Reference System">ICRS</a>) </th></tr> <tr style="vertical-align:top"> <th style="text-align:left"><a href="/wiki/Constellation" title="Constellation">Constellation</a> </th> <td><a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a> </td></tr> <tr style="vertical-align:top"> <th style="text-align:left"><span class="nowrap"><a href="/wiki/Right_ascension" title="Right ascension">Right ascension</a></span> </th> <td><span class="nowrap">04<sup>h</sup> 17<sup>m</sup> 53.66241<sup>s</sup></span><sup id="cite_ref-vanLeeuwen2007_1-0" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </td></tr> <tr style="vertical-align:top"> <th style="text-align:left"><a href="/wiki/Declination" title="Declination">Declination</a> </th> <td>−33° 47′ 54.0569″<sup id="cite_ref-vanLeeuwen2007_1-1" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </td></tr> <tr style="vertical-align:top"> <th style="text-align:left"><span class="nowrap"><a href="/wiki/Apparent_magnitude" title="Apparent magnitude">Apparent magnitude</a> (V)</span> </th> <td>3.56<sup id="cite_ref-Mermilliod1986_2-0" class="reference"><a href="#cite_note-Mermilliod1986-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th style="background-color: #FFFFC0; text-align: center;" colspan="2">Characteristics </th></tr> <tr style="vertical-align:top"> <th style="text-align:left"><a href="/wiki/Stellar_classification" title="Stellar classification">Spectral type</a> </th> <td><span class="nowrap">B8V + B9.5V</span><sup id="cite_ref-Eggleton2008_3-0" class="reference"><a href="#cite_note-Eggleton2008-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </td></tr> <tr style="vertical-align:top"> <th style="text-align:left">U−B <a href="/wiki/Color_index" title="Color index">color index</a> </th> <td>−0.36<sup id="cite_ref-Mermilliod1986_2-1" class="reference"><a href="#cite_note-Mermilliod1986-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr> <tr style="vertical-align:top"> <th style="text-align:left">B−V <a href="/wiki/Color_index" title="Color index">color index</a> </th> <td>−0.12<sup id="cite_ref-Mermilliod1986_2-2" class="reference"><a href="#cite_note-Mermilliod1986-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2"><a href="/wiki/Astrometry" title="Astrometry">Astrometry</a></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:top;"><td><b><a href="/wiki/Radial_velocity" title="Radial velocity">Radial velocity</a> (R<sub>v</sub>)</b></td><td>+17.6<sup id="cite_ref-rgcrv_4-0" class="reference"><a href="#cite_note-rgcrv-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> km/s</td></tr><tr style="vertical-align:top;"><td><b><a href="/wiki/Proper_motion" title="Proper motion">Proper motion</a> (μ)</b></td><td> <abbr title="Right Ascension">RA:</abbr> +62.52<sup id="cite_ref-vanLeeuwen2007_1-2" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Milliarcsecond" class="mw-redirect" title="Milliarcsecond">mas</a>/<a href="/wiki/Year" title="Year">yr</a> <br /> <abbr title="Declination">Dec.:</abbr> −7.24<sup id="cite_ref-vanLeeuwen2007_1-3" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Milliarcsecond" class="mw-redirect" title="Milliarcsecond">mas</a>/<a href="/wiki/Year" title="Year">yr</a> </td></tr><tr style="vertical-align:top;"><td><b><a href="/wiki/Stellar_parallax" title="Stellar parallax">Parallax</a> (π)</b></td><td>18.33 ± 0.15 <a href="/wiki/Milliarcsecond" class="mw-redirect" title="Milliarcsecond">mas</a><sup id="cite_ref-vanLeeuwen2007_1-4" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr style="vertical-align:top;"><td><b><a href="/wiki/Distance_(astronomy)" class="mw-redirect" title="Distance (astronomy)">Distance</a></b></td><td>178 ± 1 <a href="/wiki/Light-year" title="Light-year">ly</a> <br />(54.6 ± 0.4 <a href="/wiki/Parsec" title="Parsec">pc</a>)</td></tr><tr style="vertical-align:top;"><td><b><a href="/wiki/Absolute_magnitude" title="Absolute magnitude">Absolute magnitude</a> (M<sub>V</sub>)</b></td><td>−0.20<sup id="cite_ref-Hubrig2001_5-0" class="reference"><a href="#cite_note-Hubrig2001-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup></td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2"><a href="/wiki/Orbit" title="Orbit">Orbit</a><sup id="cite_ref-Hummel2017_6-0" class="reference"><a href="#cite_note-Hummel2017-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></th></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Orbital_period" title="Orbital period">Period</a> (P)</b></td><td><span class="nowrap"><span data-sort-value="7005432892080000000♠"></span>5.010<span style="margin-left:.25em;">3250</span><span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.000<span style="margin-left:.25em;">0008</span> d</span></td></tr><tr style="vertical-align:baseline;"><td><span class="nowrap"><b><a href="/wiki/Semi-major_axis" class="mw-redirect" title="Semi-major axis">Semi-major axis</a> (a)</b></span></td><td><span class="nowrap"><span data-sort-value="6991922115621470339♠"></span>1.902<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.006 mas</span></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Eccentricity_(orbit)" class="mw-redirect" title="Eccentricity (orbit)">Eccentricity</a> (e)</b></td><td>0</td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Inclination" class="mw-redirect" title="Inclination">Inclination</a> (i)</b></td><td><span class="nowrap"><span data-sort-value="7002146200000000000♠"></span>146.2<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.1</span>°</td></tr><tr style="vertical-align:baseline;"><td><span class="nowrap"><b><a href="/wiki/Periastron" class="mw-redirect" title="Periastron">Periastron</a> <a href="/wiki/Epoch_(astronomy)" title="Epoch (astronomy)">epoch</a> (T)</b></span></td><td><span class="nowrap">2454407.7214 ± 0.002 JD</span></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Semi-amplitude" class="mw-redirect" title="Semi-amplitude">Semi-amplitude</a></b> (K<sub>1</sub>)<br />(primary)</td><td><span class="nowrap"><span data-sort-value="7001626800000000000♠"></span>62.68<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.17</span><sup id="cite_ref-Hubrig2012_7-0" class="reference"><a href="#cite_note-Hubrig2012-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> km/s</td></tr><tr style="vertical-align:baseline;"><td><b>Semi-amplitude</b> (K<sub>2</sub>)<br />(secondary)</td><td><span class="nowrap"><span data-sort-value="7001647000000000000♠"></span>64.70<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.15</span><sup id="cite_ref-Hubrig2012_7-1" class="reference"><a href="#cite_note-Hubrig2012-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> km/s</td></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details<sup id="cite_ref-Hummel2017_6-1" class="reference"><a href="#cite_note-Hummel2017-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></th></tr><tr><th colspan="2" style="text-align: center">υ<sup>4</sup> Eri A</th></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Stellar_mass" title="Stellar mass">Mass</a></b></td><td><span class="nowrap"><span data-sort-value="7000317000000000000♠"></span>3.17<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.07</span> <a href="/wiki/Solar_mass" title="Solar mass"><var>M</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Radius" title="Radius">Radius</a></b></td><td><span class="nowrap"><span data-sort-value="7000231999999999999♠"></span>2.32<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.18</span> <a href="/wiki/Solar_radius" title="Solar radius"><var>R</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Luminosity" title="Luminosity">Luminosity</a></b></td><td><span class="nowrap"><span data-sort-value="7002100600000000000♠"></span>100.6<span style="margin-left:0.3em;margin-right:0.15em;">±</span>4.3</span> <a href="/wiki/Solar_luminosity" title="Solar luminosity"><var>L</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Surface_gravity" title="Surface gravity">Surface gravity</a> (log <i>g</i>)</b></td><td><span class="nowrap"><span data-sort-value="7000421000000000000♠"></span>4.21<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.07</span> <a href="/wiki/Centimetre%E2%80%93gram%E2%80%93second_system_of_units" title="Centimetre–gram–second system of units">cgs</a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Effective_temperature" title="Effective temperature">Temperature</a></b></td><td><span class="nowrap"><span data-sort-value="7004129300000000000♠"></span>12,930<span style="margin-left:0.3em;margin-right:0.15em;">±</span>440</span><sup id="cite_ref-David2015_8-0" class="reference"><a href="#cite_note-David2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Kelvin" title="Kelvin">K</a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Projected_rotational_velocity" class="mw-redirect" title="Projected rotational velocity">Rotational velocity</a> (<i>v</i> sin <i>i</i>)</b></td><td>19<sup id="cite_ref-David2015_8-1" class="reference"><a href="#cite_note-David2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> km/s</td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Stellar_evolution" title="Stellar evolution">Age</a></b></td><td>146<sup id="cite_ref-David2015_8-2" class="reference"><a href="#cite_note-David2015-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Megayear" class="mw-redirect" title="Megayear">Myr</a></td></tr><tr><th colspan="2" style="text-align: center">υ<sup>4</sup> Eri B</th></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Stellar_mass" title="Stellar mass">Mass</a></b></td><td><span class="nowrap"><span data-sort-value="7000307000000000000♠"></span>3.07<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.07</span> <a href="/wiki/Solar_mass" title="Solar mass"><var>M</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Radius" title="Radius">Radius</a></b></td><td><span class="nowrap"><span data-sort-value="7000231999999999999♠"></span>2.32<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.18</span> <a href="/wiki/Solar_radius" title="Solar radius"><var>R</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b>Luminosity</b></td><td><span class="nowrap"><span data-sort-value="7001874000000000000♠"></span>87.4<span style="margin-left:0.3em;margin-right:0.15em;">±</span>3.3</span> <a href="/wiki/Solar_luminosity" title="Solar luminosity"><var>L</var><sub>☉</sub></a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Surface_gravity" title="Surface gravity">Surface gravity</a> (log <i>g</i>)</b></td><td><span class="nowrap"><span data-sort-value="7000421000000000000♠"></span>4.21<span style="margin-left:0.3em;margin-right:0.15em;">±</span>0.07</span> <a href="/wiki/Centimetre%E2%80%93gram%E2%80%93second_system_of_units" title="Centimetre–gram–second system of units">cgs</a></td></tr><tr style="vertical-align:baseline;"><td><b><a href="/wiki/Effective_temperature" title="Effective temperature">Temperature</a></b></td><td>12,250 <a href="/wiki/Kelvin" title="Kelvin">K</a></td></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2"><a href="/wiki/Star_catalogue" title="Star catalogue">Other designations</a></th></tr><tr><td colspan="2"><div style="width: 250px;"> υ<sup>4</sup> Eri, <a href="/wiki/Flamsteed_designation" title="Flamsteed designation">41 Eridani</a>, <a href="/wiki/Durchmusterung" title="Durchmusterung">CD</a>−34° 1614, <a href="/wiki/Henry_Draper_Catalogue" title="Henry Draper Catalogue">HD</a> 27376, <a href="/wiki/Hipparcos_Catalogue" class="mw-redirect" title="Hipparcos Catalogue">HIP</a> 20042, <a href="/wiki/Bright_Star_Catalogue" title="Bright Star Catalogue">HR</a> 1347, <a href="/wiki/Smithsonian_Astrophysical_Observatory_Star_Catalog" title="Smithsonian Astrophysical Observatory Star Catalog">SAO</a> 194902.<sup id="cite_ref-SIMBAD_9-0" class="reference"><a href="#cite_note-SIMBAD-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </div></td></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Database references</th></tr><tr style="vertical-align: top;"><td><b><a href="/wiki/SIMBAD" title="SIMBAD">SIMBAD</a></b></td><td><a rel="nofollow" class="external text" href="https://simbad.cds.unistra.fr/simbad/sim-id?Ident=ups04+Eri">data</a></td></tr> </tbody></table> <p><b>Upsilon<sup>4</sup> Eridani</b> is a close <a href="/wiki/Binary_star" title="Binary star">binary star</a> system in the <a href="/wiki/Constellation" title="Constellation">constellation</a> <a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Eridanus</a>. It is visible to the naked eye with an <a href="/wiki/Apparent_visual_magnitude" class="mw-redirect" title="Apparent visual magnitude">apparent visual magnitude</a> of 3.56.<sup id="cite_ref-Mermilliod1986_2-3" class="reference"><a href="#cite_note-Mermilliod1986-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Based upon <a href="/wiki/Stellar_parallax" title="Stellar parallax">parallax</a> measurements, the pair are located around 54.6 parsecs (178 ly) from the Sun.<sup id="cite_ref-vanLeeuwen2007_1-5" class="reference"><a href="#cite_note-vanLeeuwen2007-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>This is a double-lined <a href="/wiki/Spectroscopic_binary" class="mw-redirect" title="Spectroscopic binary">spectroscopic binary</a> star system,<sup id="cite_ref-chini2012_10-0" class="reference"><a href="#cite_note-chini2012-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> which means that the <a href="/wiki/Doppler_effect" title="Doppler effect">Doppler-shifted</a> <a href="/wiki/Spectral_line" title="Spectral line">spectral lines</a> of both components can be distinguished. The pair have a circular orbit with a <a href="/wiki/Orbital_period" title="Orbital period">period</a> of five days. The system is composed of two <a href="/wiki/B-type_main-sequence_star" title="B-type main-sequence star">B-type main-sequence stars</a>: one has a <a href="/wiki/Stellar_classification" title="Stellar classification">stellar classification</a> of B8V and the other B9.5V.<sup id="cite_ref-Eggleton2008_3-1" class="reference"><a href="#cite_note-Eggleton2008-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Both stars show <a href="/wiki/Mercury-manganese_star" title="Mercury-manganese star">HgMn peculiarities</a> in their spectrum,<sup id="cite_ref-Hubrig2012_7-2" class="reference"><a href="#cite_note-Hubrig2012-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> and their properties are nearly identical.<sup id="cite_ref-Hummel2017_6-2" class="reference"><a href="#cite_note-Hummel2017-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> The spin rate of the two stars is synchronized to their orbital period.<sup id="cite_ref-Hummel2017_6-3" class="reference"><a href="#cite_note-Hummel2017-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> It is possible that a nearby K-type star is also related.<sup id="cite_ref-Eggleton2008_3-2" class="reference"><a href="#cite_note-Eggleton2008-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <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=Upsilon4_Eridani&action=edit&section=1" 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"><ol class="references"> <li id="cite_note-vanLeeuwen2007-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-vanLeeuwen2007_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-vanLeeuwen2007_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-vanLeeuwen2007_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-vanLeeuwen2007_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-vanLeeuwen2007_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-vanLeeuwen2007_1-5"><sup><i><b>f</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 id="CITEREFvan_Leeuwen2007" class="citation cs2">van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", <i>Astronomy and Astrophysics</i>, <b>474</b> (2): 653–664, <a href="/wiki/ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/0708.1752">0708.1752</a></span>, <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/2007A&A...474..653V">2007A&A...474..653V</a>, <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1051%2F0004-6361%3A20078357">10.1051/0004-6361:20078357</a>, <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:18759600">18759600</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Astronomy+and+Astrophysics&rft.atitle=Validation+of+the+new+Hipparcos+reduction&rft.volume=474&rft.issue=2&rft.pages=653-664&rft.date=2007&rft_id=info%3Aarxiv%2F0708.1752&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A18759600%23id-name%3DS2CID&rft_id=info%3Adoi%2F10.1051%2F0004-6361%3A20078357&rft_id=info%3Abibcode%2F2007A%26A...474..653V&rft.aulast=van+Leeuwen&rft.aufirst=F.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AUpsilon4+Eridani" class="Z3988"></span></span> </li> <li id="cite_note-Mermilliod1986-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-Mermilliod1986_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Mermilliod1986_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Mermilliod1986_2-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Mermilliod1986_2-3"><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="CITEREFMermilliod1986" class="citation cs2">Mermilliod, J.-C. 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.hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Constellation_of_Eridanus" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="text-align: center;"><link rel="mw-deduplicated-inline-style" 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:Eridanus_(constellation)" title="Template:Eridanus (constellation)"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Eridanus_(constellation)" title="Template talk:Eridanus (constellation)"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Eridanus_(constellation)" title="Special:EditPage/Template:Eridanus (constellation)"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Constellation_of_Eridanus" style="font-size:114%;margin:0 4em"><a href="/wiki/Eridanus_(constellation)" title="Eridanus (constellation)">Constellation of Eridanus</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_Eridanus" title="List of stars in Eridanus">List of stars in Eridanus</a></li> <li><a href="/wiki/Eridanus_in_Chinese_astronomy" title="Eridanus in Chinese astronomy">Eridanus 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/Achernar" title="Achernar">α (Achernar)</a></li> <li><a href="/wiki/Beta_Eridani" title="Beta Eridani">β (Cursa)</a></li> <li><a href="/wiki/Gamma_Eridani" title="Gamma Eridani">γ (Zaurak)</a></li> <li><a href="/wiki/Delta_Eridani" title="Delta Eridani">δ (Rana)</a></li> <li><a href="/wiki/Epsilon_Eridani" title="Epsilon Eridani">ε (Ran)</a></li> <li><a href="/wiki/Zeta_Eridani" title="Zeta Eridani">ζ (Zibal)</a></li> <li><a href="/wiki/Eta_Eridani" title="Eta Eridani">η (Azha)</a></li> <li><a href="/wiki/Theta_Eridani" title="Theta Eridani">θ<sup>1</sup> (Acamar)</a></li> <li><a href="/wiki/Theta_Eridani" title="Theta Eridani">θ<sup>2</sup></a></li> <li><a href="/wiki/Iota_Eridani" title="Iota Eridani">ι</a></li> <li><a href="/wiki/Kappa_Eridani" title="Kappa Eridani">κ</a></li> <li><a href="/wiki/Lambda_Eridani" title="Lambda Eridani">λ</a></li> <li><a href="/wiki/Mu_Eridani" title="Mu Eridani">μ</a></li> <li><a href="/wiki/Nu_Eridani" title="Nu Eridani">ν</a></li> <li><a href="/wiki/Xi_Eridani" title="Xi Eridani">ξ</a></li> <li><a href="/wiki/Omicron1_Eridani" title="Omicron1 Eridani">ο<sup>1</sup> (Beid)</a></li> <li><a href="/wiki/40_Eridani" title="40 Eridani">ο<sup>2</sup> (40, Keid)</a></li> <li><a href="/wiki/Pi_Eridani" title="Pi Eridani">π</a></li> <li><a href="/wiki/Rho1_Eridani" title="Rho1 Eridani">ρ<sup>1</sup></a></li> <li><a href="/wiki/Rho2_Eridani" title="Rho2 Eridani">ρ<sup>2</sup></a></li> <li><a href="/wiki/Rho3_Eridani" title="Rho3 Eridani">ρ<sup>3</sup></a></li> <li><a href="/wiki/Tau1_Eridani" title="Tau1 Eridani">τ<sup>1</sup></a></li> <li><a href="/wiki/Tau2_Eridani" title="Tau2 Eridani">τ<sup>2</sup> (Angetenar)</a></li> <li><a href="/wiki/Tau3_Eridani" title="Tau3 Eridani">τ<sup>3</sup></a></li> <li><a href="/wiki/Tau4_Eridani" title="Tau4 Eridani">τ<sup>4</sup></a></li> <li><a href="/wiki/Tau5_Eridani" title="Tau5 Eridani">τ<sup>5</sup></a></li> <li><a href="/wiki/Tau6_Eridani" title="Tau6 Eridani">τ<sup>6</sup></a></li> <li><a href="/wiki/Tau7_Eridani" title="Tau7 Eridani">τ<sup>7</sup></a></li> <li><a href="/wiki/Tau8_Eridani" title="Tau8 Eridani">τ<sup>8</sup></a></li> <li><a href="/wiki/Tau9_Eridani" title="Tau9 Eridani">τ<sup>9</sup></a></li> <li><a href="/wiki/Upsilon1_Eridani" title="Upsilon1 Eridani">υ<sup>1</sup></a></li> <li><a href="/wiki/Upsilon2_Eridani" title="Upsilon2 Eridani">υ<sup>2</sup> (Theemin)</a></li> <li><a href="/wiki/Upsilon3_Eridani" title="Upsilon3 Eridani">υ<sup>3</sup> (Beemim)</a></li> <li><a class="mw-selflink selflink">υ<sup>4</sup></a></li> <li><a href="/wiki/Phi_Eridani" title="Phi Eridani">φ</a></li> <li><a href="/wiki/Chi_Eridani" title="Chi Eridani">χ</a></li> <li><a href="/wiki/Psi_Eridani" title="Psi Eridani">ψ</a></li> <li><a href="/wiki/Omega_Eridani" title="Omega Eridani">ω</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/Flamsteed_designation" title="Flamsteed designation">Flamsteed</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/14_Eridani" title="14 Eridani">14</a></li> <li><a href="/wiki/15_Eridani" title="15 Eridani">15</a></li> <li><a href="/wiki/17_Eridani" title="17 Eridani">17 (v)</a></li> <li><a href="/wiki/39_Eridani" title="39 Eridani">39 (A)</a></li> <li><a href="/wiki/45_Eridani" title="45 Eridani">45</a></li> <li><a href="/wiki/51_Eridani" title="51 Eridani">51 (c)</a></li> <li><a href="/wiki/53_Eridani" title="53 Eridani">53 (Sceptrum)</a></li> <li><a href="/wiki/54_Eridani" title="54 Eridani">54</a></li> <li><a href="/wiki/58_Eridani" title="58 Eridani">58</a></li> <li><a href="/wiki/64_Eridani" title="64 Eridani">64</a></li> <li><a href="/wiki/66_Eridani" title="66 Eridani">66</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-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/HR_1217" title="HR 1217">DO</a></li> <li><a href="/wiki/HD_28843" title="HD 28843">DZ</a></li> <li><a href="/wiki/EF_Eridani" title="EF Eridani">EF</a></li> <li><a href="/wiki/EK_Eridani" title="EK Eridani">EK</a></li> <li><a href="/wiki/HD_27563" title="HD 27563">EM (d)</a></li> <li><a href="/wiki/HD_17925" title="HD 17925">EP</a></li> <li><a href="/wiki/KT_Eridani" title="KT Eridani">KT</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:70px"><a href="/wiki/Bright_Star_Catalogue" title="Bright Star Catalogue">HR</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/P_Eridani" title="P Eridani">486 (p)</a></li> <li><a href="/wiki/P_Eridani" title="P Eridani">487 (p)</a></li> <li><a href="/wiki/HD_10647" title="HD 10647">506 (q<sup>1</sup>)</a></li> <li><a href="/wiki/HD_16754" title="HD 16754">789 (s)</a></li> <li><a href="/wiki/HD_17943" title="HD 17943">859</a></li> <li><a href="/wiki/82_G._Eridani" title="82 G. Eridani">1008 (e)</a></li> <li><a href="/wiki/HD_22663" title="HD 22663">1106 (y)</a></li> <li><a href="/wiki/HD_23319" title="HD 23319">1143 (h)</a></li> <li><a href="/wiki/F_Eridani" title="F Eridani">1189 (f)</a></li> <li><a href="/wiki/F_Eridani" title="F Eridani">1190 (f)</a></li> <li><a href="/wiki/HD_24160" title="HD 24160">1195 (g)</a></li> <li><a href="/wiki/HD_29573" title="HD 29573">1483</a></li> <li><a href="/wiki/HD_30562" title="HD 30562">1536</a></li> <li><a href="/wiki/HR_1614" title="HR 1614">1614</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_18742" title="HD 18742">18742 (Ayeyarwady)</a></li> <li><a href="/wiki/HD_19467" title="HD 19467">19467</a></li> <li><a href="/wiki/HD_28185" title="HD 28185">28185</a></li> <li><a href="/wiki/HD_30562" title="HD 30562">30562</a></li> <li><a href="/wiki/HD_30856" title="HD 30856">30856 (Mouhoun)</a></li> <li><a href="/wiki/HD_30963" title="HD 30963">30963</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/2MASS_J04151954%E2%88%920935066" title="2MASS J04151954−0935066">2MASS J04151954−0935066</a></li> <li><a href="/wiki/DENIS_0255%E2%88%924700" title="DENIS 0255−4700">DENIS 0255−4700</a></li> <li><a href="/wiki/Gliese_86" title="Gliese 86">Gliese 86</a></li> <li><a href="/wiki/Gliese_180" title="Gliese 180">Gliese 180</a></li> <li><a href="/wiki/GJ_1062" title="GJ 1062">GJ 1062</a></li> <li><a href="/wiki/GJ_3293" title="GJ 3293">GJ 3293</a></li> <li><a href="/wiki/GJ_3323" title="GJ 3323">GJ 3323</a></li> <li><a href="/wiki/HIP_12961" title="HIP 12961">HIP 12961 (Koeia)</a></li> <li><a href="/wiki/LTT_1445" title="LTT 1445">LTT 1445</a></li> <li><a href="/wiki/LP_890-9" title="LP 890-9">LP 890-9</a></li> <li><a href="/wiki/Mothra_(star)" title="Mothra (star)">Mothra</a></li> <li><a href="/wiki/WASP-22" class="mw-redirect" title="WASP-22">WASP-22 (Tojil)</a></li> <li><a href="/wiki/WASP-35" title="WASP-35">WASP-35</a></li> <li><a href="/wiki/WASP-50" title="WASP-50">WASP-50 (Chaophraya)</a></li> <li><a href="/wiki/WASP-78" title="WASP-78">WASP-78</a></li> <li><a href="/wiki/WASP-79" class="mw-redirect" title="WASP-79">WASP-79 (Montuno)</a></li> <li><a href="/wiki/WISE_J0336%E2%88%920143" title="WISE J0336−0143">WISE J0336−0143</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/51_Eridani_b" title="51 Eridani b">51 Eridani b</a></li> <li><a href="/wiki/Epsilon_Eridani_b" title="Epsilon Eridani b">ε Eridani b (AEgir)</a></li> <li><a href="/wiki/Gliese_86_b" title="Gliese 86 b">Gliese 86 b</a></li> <li><a href="/wiki/HD_10647_b" title="HD 10647 b">HD 10647 b</a></li> <li><a href="/wiki/HD_18742_b" class="mw-redirect" title="HD 18742 b">HD 18742 b (Bagan)</a></li> <li><a href="/wiki/HD_28185_b" title="HD 28185 b">HD 28185 b</a></li> <li><a href="/wiki/HD_30562_b" title="HD 30562 b">HD 30562 b</a></li> <li><a href="/wiki/HD_30856_b" class="mw-redirect" title="HD 30856 b">HD 30856 Ab (Nakanbé)</a></li> <li><a href="/wiki/WASP-79b" title="WASP-79b">WASP-79b (Pollera)</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/Nebula" title="Nebula">Nebulae</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-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/NGC_1535" title="NGC 1535">1535</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">NGC</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_782" title="NGC 782">782</a></li> <li><a href="/wiki/NGC_852" title="NGC 852">852</a></li> <li><a href="/wiki/NGC_939" title="NGC 939">939</a></li> <li><a href="/wiki/NGC_1084" title="NGC 1084">1084</a></li> <li><a href="/wiki/NGC_1132" title="NGC 1132">1132</a></li> <li><a href="/wiki/NGC_1140" title="NGC 1140">1140</a></li> <li><a href="/wiki/NGC_1172" title="NGC 1172">1172</a></li> <li><a href="/wiki/NGC_1187" title="NGC 1187">1187</a></li> <li><a href="/wiki/NGC_1189" title="NGC 1189">1189</a></li> <li><a href="/wiki/NGC_1190" title="NGC 1190">1190</a></li> <li><a href="/wiki/NGC_1191" title="NGC 1191">1191</a></li> <li><a href="/wiki/NGC_1192" title="NGC 1192">1192</a></li> <li><a href="/wiki/NGC_1199" title="NGC 1199">1199</a></li> <li><a href="/wiki/NGC_1222" title="NGC 1222">1222</a></li> <li><a href="/wiki/NGC_1232" title="NGC 1232">1232</a></li> <li><a href="/wiki/NGC_1234" title="NGC 1234">1234</a></li> <li><a href="/wiki/NGC_1241" title="NGC 1241">1241</a></li> <li><a href="/wiki/NGC_1253" title="NGC 1253">1253</a></li> <li><a href="/wiki/NGC_1262" title="NGC 1262">1262</a></li> <li><a href="/wiki/NGC_1266" title="NGC 1266">1266</a></li> <li><a href="/wiki/NGC_1269" class="mw-redirect" title="NGC 1269">1269</a></li> <li><a href="/wiki/NGC_1291" title="NGC 1291">1291</a></li> <li><a href="/wiki/NGC_1300" title="NGC 1300">1300</a></li> <li><a href="/wiki/NGC_1309" title="NGC 1309">1309</a></li> <li><a href="/wiki/NGC_1325" title="NGC 1325">1325</a></li> <li><a href="/wiki/NGC_1332" title="NGC 1332">1332</a></li> <li><a href="/wiki/NGC_1337" title="NGC 1337">1337</a></li> <li><a href="/wiki/NGC_1345" title="NGC 1345">1345</a></li> <li><a href="/wiki/NGC_1347" title="NGC 1347">1347</a></li> <li><a href="/wiki/NGC_1353" title="NGC 1353">1353</a></li> <li><a href="/wiki/NGC_1357" title="NGC 1357">1357</a></li> <li><a href="/wiki/NGC_1369" title="NGC 1369">1369</a></li> <li><a href="/wiki/NGC_1386" title="NGC 1386">1386</a></li> <li><a href="/wiki/NGC_1395" title="NGC 1395">1395</a></li> <li><a href="/wiki/NGC_1400" title="NGC 1400">1400</a></li> <li><a href="/wiki/NGC_1403" title="NGC 1403">1403</a></li> <li><a href="/wiki/NGC_1404" title="NGC 1404">1404</a></li> <li><a href="/wiki/NGC_1407" title="NGC 1407">1407</a></li> <li><a href="/wiki/NGC_1426" title="NGC 1426">1426</a></li> <li><a href="/wiki/NGC_1427A" title="NGC 1427A">1427A</a></li> <li><a href="/wiki/NGC_1436" title="NGC 1436">1436</a></li> <li><a href="/wiki/NGC_1437" class="mw-redirect" title="NGC 1437">1437</a></li> <li><a href="/wiki/NGC_1439" title="NGC 1439">1439</a></li> <li><a href="/wiki/NGC_1452" title="NGC 1452">1452</a></li> <li><a href="/wiki/NGC_1460" title="NGC 1460">1460</a></li> <li><a href="/wiki/NGC_1487" title="NGC 1487">1487</a></li> <li><a href="/wiki/NGC_1531" title="NGC 1531">1531</a></li> <li><a href="/wiki/NGC_1532" title="NGC 1532">1532</a></li> <li><a href="/wiki/NGC_1592" title="NGC 1592">1592</a></li> <li><a href="/wiki/NGC_1600" title="NGC 1600">1600</a></li> <li><a href="/wiki/NGC_1614" title="NGC 1614">1614</a></li> <li><a href="/wiki/NGC_1637" title="NGC 1637">1637</a></li> <li><a href="/wiki/NGC_1721" title="NGC 1721">1721</a></li> <li><a href="/wiki/NGC_1723" title="NGC 1723">1723</a></li> <li><a href="/wiki/NGC_1725" title="NGC 1725">1725</a></li> <li><a href="/wiki/NGC_1728" title="NGC 1728">1728</a></li> <li><a href="/wiki/NGC_1741" title="NGC 1741">1741</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/Eridanus_II" title="Eridanus II">Eridanus II</a></li> <li><a href="/wiki/ESO_198-13" title="ESO 198-13">ESO 198-13</a></li> <li><a href="/wiki/ESO_0313-192" title="ESO 0313-192">ESO 0313-192</a></li> <li><a href="/wiki/IC_1953" title="IC 1953">IC 1953</a></li> <li><a href="/wiki/IC_2006" title="IC 2006">IC 2006</a></li> <li><a href="/wiki/LEDA_74886" title="LEDA 74886">LEDA 74886</a></li> <li><a href="/wiki/MRC_0406-244" title="MRC 0406-244">MRC 0406-244</a></li> <li><a href="/wiki/PKS_0208-512" title="PKS 0208-512">PKS 0208-512</a></li> <li><a href="/wiki/PKS_0405%E2%80%93385" title="PKS 0405–385">PKS 0405–385</a></li> <li><a href="/wiki/PKS_0420-014" title="PKS 0420-014">PKS 0420-014</a></li> <li><a href="/wiki/UGC_2812" title="UGC 2812">UGC 2812</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="Galaxy_clusters" scope="row" class="navbox-group" style="width:151px;background: #ddddff;"><a href="/wiki/Galaxy_cluster" title="Galaxy cluster">Galaxy clusters</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/Abell_383" title="Abell 383">Abell 383</a></li> <li><a href="/wiki/Eridanus_Cluster" title="Eridanus Cluster">Eridanus Cluster</a></li> <li><a href="/wiki/Eridanus_Group" title="Eridanus Group">Eridanus Group</a></li> <li><a href="/wiki/MACS_J0416.1-2403" title="MACS J0416.1-2403">MACS J0416.1-2403</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="Astronomical_events" scope="row" class="navbox-group" style="width:151px;background: #ddddff;"><a href="/wiki/Transient_astronomical_event" class="mw-redirect" title="Transient astronomical event">Astronomical events</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/GRB_080913" title="GRB 080913">GRB 080913</a></li> <li><a href="/wiki/HE0435-1223" title="HE0435-1223">HE0435-1223</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:Eridanus_(constellation)" 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