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class="firstHeading mw-first-heading"><span class="mw-page-title-main">Fenditura del Cigno</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="Vai a una voce in un'altra lingua. Disponibile in 14 lingue" > <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-14" 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">14 lingue</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/Groot_Rif" title="Groot Rif - afrikaans" lang="af" hreflang="af" data-title="Groot Rif" 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%A7%D9%84%D8%B5%D8%AF%D8%B9_%D8%A7%D9%84%D8%B9%D8%B8%D9%8A%D9%85_(%D8%B9%D9%84%D9%85_%D8%A7%D9%84%D9%81%D9%84%D9%83)" title="الصدع العظيم (علم الفلك) - arabo" lang="ar" hreflang="ar" data-title="الصدع العظيم (علم الفلك)" data-language-autonym="العربية" data-language-local-name="arabo" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/B%C3%B6y%C3%BCk_Yar%C4%B1q" title="Böyük Yarıq - azerbaigiano" lang="az" hreflang="az" data-title="Böyük Yarıq" data-language-autonym="Azərbaycanca" data-language-local-name="azerbaigiano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9C%CE%B5%CE%B3%CE%AC%CE%BB%CE%B7_%CE%A1%CF%89%CE%B3%CE%BC%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)" title="Μεγάλη Ρωγμή (αστρονομία) - greco" lang="el" hreflang="el" data-title="Μεγάλη Ρωγμή (αστρονομία)" data-language-autonym="Ελληνικά" data-language-local-name="greco" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Great_Rift_(astronomy)" title="Great Rift (astronomy) - inglese" lang="en" hreflang="en" data-title="Great Rift (astronomy)" data-language-autonym="English" data-language-local-name="inglese" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B4%DA%A9%D8%A7%D9%81_%D8%A8%D8%B2%D8%B1%DA%AF_(%D8%A7%D8%AE%D8%AA%D8%B1%D8%B4%D9%86%D8%A7%D8%B3%DB%8C)" title="شکاف بزرگ (اخترشناسی) - persiano" lang="fa" hreflang="fa" data-title="شکاف بزرگ (اخترشناسی)" data-language-autonym="فارسی" data-language-local-name="persiano" 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/Grand_Rift_(astronomie)" title="Grand Rift (astronomie) - francese" lang="fr" hreflang="fr" data-title="Grand Rift (astronomie)" data-language-autonym="Français" data-language-local-name="francese" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Sjeverna_vre%C4%87a_ugljena_(tamna_maglica)" title="Sjeverna vreća ugljena (tamna maglica) - croato" lang="hr" hreflang="hr" data-title="Sjeverna vreća ugljena (tamna maglica)" data-language-autonym="Hrvatski" data-language-local-name="croato" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Grote_Rift" title="Grote Rift - olandese" lang="nl" hreflang="nl" data-title="Grote Rift" data-language-autonym="Nederlands" 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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=20&de=30&zoom=6&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=1&show_galaxies=1&img_source=IMG_all">20<sup>h</sup> 00<sup>m</sup> 00<sup>s</sup>, +30° 00′ 00″</a></span></div></div> </div> <div id="siteSub" class="noprint">Da Wikipedia, l'enciclopedia libera.</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="it" dir="ltr"><table class="infobox sinottico" summary="Tabella sinottica che riassume i principali dati del soggetto" style="width:300px"><tbody><tr class="sinottico_testata"><th colspan="2" style="background: #C0C0C0; color: black">Fenditura del Cigno<br /><span class="sinottico_sottotitolo"><a href="/wiki/Nebulosa_oscura" title="Nebulosa oscura">Nebulosa oscura</a></span></th></tr><tr><td class="sinottico_testo_centrale" colspan="2"><figure class="mw-halign-center" typeof="mw:File/Frameless"><a href="/wiki/File:Perseid_Meteor.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Perseid_Meteor.jpg/280px-Perseid_Meteor.jpg" decoding="async" width="280" height="254" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Perseid_Meteor.jpg/420px-Perseid_Meteor.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/65/Perseid_Meteor.jpg/560px-Perseid_Meteor.jpg 2x" data-file-width="777" data-file-height="704" /></a><figcaption></figcaption></figure>La Fenditura del Cigno in tutta la sua lunghezza</td></tr><tr class="sinottico_divisione"><th colspan="2" style="background: #C0C0C0; color: black">Dati osservativi<br /><small>(<a href="/wiki/Epoca_(astronomia)" title="Epoca (astronomia)">epoca</a> <a href="/wiki/J2000.0" title="J2000.0">J2000.0</a>)</small></th></tr><tr><th style="width:45%"><a href="/wiki/Costellazione" title="Costellazione">Costellazione</a></th><td><a href="/wiki/Cigno_(costellazione)" title="Cigno (costellazione)">Cigno</a> </td></tr><tr><th style="width:45%"><a href="/wiki/Ascensione_retta" title="Ascensione retta">Ascensione retta</a></th><td>20<sup>h</sup> : </td></tr><tr><th style="width:45%"><a href="/wiki/Declinazione_(astronomia)" title="Declinazione (astronomia)">Declinazione</a></th><td>+30° : </td></tr><tr><th style="width:45%"><a href="/wiki/Sistema_di_coordinate_galattiche" title="Sistema di coordinate galattiche">Coordinate galattiche</a></th><td>30° - 85°; 0° </td></tr><tr><th style="width:45%"><a href="/wiki/Distanza_astronomica" title="Distanza astronomica">Distanza</a></th><td>2600 <a href="/wiki/Anno_luce" title="Anno luce">a.l.</a> <sup id="cite_ref-H_II_region_1-0" class="reference"><a href="#cite_note-H_II_region-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <br /> (797 <a href="/wiki/Parsec" title="Parsec">pc</a>) </td></tr><tr><th style="width:45%"><a href="/wiki/Magnitudine_apparente" title="Magnitudine apparente">Magnitudine apparente</a> <small title="luce visibile">(V)</small></th><td>- </td></tr><tr><th style="width:45%"><a href="/wiki/Diametro_angolare" title="Diametro angolare">Dimensione apparente</a> <small title="luce visibile">(V)</small></th><td>55° x 5° </td></tr><tr class="sinottico_divisione"><th colspan="2" style="background: #C0C0C0; color: black">Caratteristiche fisiche</th></tr><tr><th style="width:45%">Tipo</th><td><a href="/wiki/Nebulosa_oscura" title="Nebulosa oscura">Nebulosa oscura</a> </td></tr><tr><th style="width:45%"><a href="/wiki/Galassia" title="Galassia">Galassia di appartenenza</a></th><td>Via Lattea </td></tr><tr><th style="width:45%">Dimensioni</th><td>900 <a href="/wiki/Anno_luce" title="Anno luce">a.l.</a> <sup id="cite_ref-map_2-0" class="reference"><a href="#cite_note-map-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <br /> (276 <a href="/wiki/Parsec" title="Parsec">pc</a>) </td></tr><tr class="sinottico_divisione"><th colspan="2" style="background: #C0C0C0; color: black">Mappa di localizzazione</th></tr><tr><td class="sinottico_testo_centrale" colspan="2"><div style="position: relative; width: 260px; margin: auto; float: {{{allineamento}}}; clear: {{{allineamento}}};"><div style="position: absolute; left: 154px; top: 212px; padding: 0;"><span class="mw-valign-top" typeof="mw:File"><a href="/wiki/File:Cercle_rouge_100%25.svg" class="mw-file-description" title="Fenditura del Cigno"><img alt="Fenditura del Cigno" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Cercle_rouge_100%25.svg/15px-Cercle_rouge_100%25.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Cercle_rouge_100%25.svg/23px-Cercle_rouge_100%25.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Cercle_rouge_100%25.svg/30px-Cercle_rouge_100%25.svg.png 2x" data-file-width="200" data-file-height="200" /></a></span></div><span typeof="mw:File"><a href="/wiki/File:Cygnus_IAU.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Cygnus_IAU.svg/260px-Cygnus_IAU.svg.png" decoding="async" width="260" height="320" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Cygnus_IAU.svg/390px-Cygnus_IAU.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Cygnus_IAU.svg/520px-Cygnus_IAU.svg.png 2x" data-file-width="606" data-file-height="745" /></a></span></div> </td></tr><tr><td colspan="2" class="sinottico_piede" style="background: #C0C0C0; color: black"><a href="/wiki/Categoria:Nebulose_oscure" title="Categoria:Nebulose oscure">Categoria di nebulose oscure</a> </td></tr></tbody></table><style data-mw-deduplicate="TemplateStyles:r139486644">body.skin-vector .mw-parser-output #coordinates{font-size:85%;line-height:1.5em;white-space:nowrap}</style> <p>La <b>Fenditura del Cigno</b> è un enorme complesso di <a href="/wiki/Nebulosa_oscura" title="Nebulosa oscura">nebulosità oscure</a> e di polveri interstellari, che interessano il ramo boreale della <a href="/wiki/Via_Lattea" title="Via Lattea">Via Lattea</a>. </p><p>Il complesso si osserva a sud di <a href="/wiki/Deneb" title="Deneb">Deneb</a>, la <a href="/wiki/Stella" title="Stella">stella</a> più brillante della <a href="/wiki/Cigno_(costellazione)" title="Cigno (costellazione)">costellazione del Cigno</a>, e si dirige verso sud "tagliando" in due la Via Lattea, dapprima lasciandosi ad ovest la parte più luminosa, poi, in direzione della <a href="/wiki/Volpetta_(costellazione)" title="Volpetta (costellazione)">Volpetta</a>, cambia direzione e lascia visibile un ricco campo stellare nella <a href="/wiki/Freccia_(costellazione)" title="Freccia (costellazione)">costellazione della Freccia</a>. Si tratta della parte più settentrionale della lunga fascia di nebulose oscure che attraversa in senso longitudinale tutto il tratto di Via Lattea boreale visibile durante i mesi estivi settentrionali, che termina all'altezza dell'equatore celeste, dove devia verso ovest e si disperde al di fuori della scia luminosa, nella costellazione dell'<a href="/wiki/Ofiuco" title="Ofiuco">Ofiuco</a>. Dalle regioni boreali è perfettamente visibile ad occhio nudo nelle notti d'estate; talvolta la parte più settentrionale della nebulosa viene chiamata <i>Sacco di Carbone Boreale</i>, in contrapposizione con l'<a href="/wiki/Nebulosa_Sacco_di_Carbone" title="Nebulosa Sacco di Carbone">omonima</a> nebulosa australe.<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> </p><p>Il complesso di gas e polveri che formano la Fenditura comprende anche alcune aree illuminate ed evidenti: la <a href="/wiki/Nebulosa_Nord_America" title="Nebulosa Nord America">Nebulosa Nord America</a> e la <a href="/wiki/Nebulosa_Pellicano" title="Nebulosa Pellicano">Nebulosa Pellicano</a> fanno infatti parte della stessa struttura, estesa per quasi mille anni luce;<sup id="cite_ref-map_2-1" class="reference"><a href="#cite_note-map-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> la regione si trova a circa 2600 <a href="/wiki/Anni_luce" class="mw-redirect" title="Anni luce">anni luce</a> (800 <a href="/wiki/Parsec" title="Parsec">parsec</a>) da noi, e funge da separazione fra la nostra area del <a href="/wiki/Braccio_di_Orione" title="Braccio di Orione">Braccio di Orione</a>, in cui si trova la <a href="/wiki/Cintura_di_Gould" title="Cintura di Gould">Cintura di Gould</a>, e la regione retrostante, delle grandi <a href="/wiki/Associazione_OB" title="Associazione OB">associazioni OB</a> del Cigno e del vastissimo <a href="/wiki/Complesso_nebuloso_molecolare_del_Cigno" title="Complesso nebuloso molecolare del Cigno">Complesso nebuloso molecolare del Cigno</a>, la cui luce ci viene celata dalle nubi della stessa Fenditura.<sup id="cite_ref-H_II_region_1-1" class="reference"><a href="#cite_note-H_II_region-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Note">Note</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fenditura_del_Cigno&veaction=edit&section=1" title="Modifica la sezione Note" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Fenditura_del_Cigno&action=edit&section=1" title="Edit section's source code: Note"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-H_II_region-1"><span class="mw-cite-backlink"><b>^</b> <sup><i><a href="#cite_ref-H_II_region_1-0">a</a></i></sup> <sup><i><a href="#cite_ref-H_II_region_1-1">b</a></i></sup></span> <span class="reference-text"><cite class="citation pubblicazione" style="font-style:normal"> Blitz, L.; Fich, M.; Stark, A. A., <a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1982ApJS...49..183B"><span style="font-style:italic;">Catalog of CO radial velocities toward galactic H II regions</span></a>, in <span style="font-style:italic;">Astrophysical Journal Supplement Series</span>, vol. 49, giugno 1982, pp. 183-206, <a href="/wiki/Digital_object_identifier" title="Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://dx.doi.org/10.1086%2F190795">10.1086/190795</a>. <small>URL consultato il 5 marzo 2009</small>.</cite></span> </li> <li id="cite_note-map-2"><span class="mw-cite-backlink"><b>^</b> <sup><i><a href="#cite_ref-map_2-0">a</a></i></sup> <sup><i><a href="#cite_ref-map_2-1">b</a></i></sup></span> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="http://galaxymap.org/"><span style="font-style:italic;">Galaxy Map</span></a>, su <span style="font-style:italic;"><a rel="nofollow" class="external text" href="http://galaxymap.org/cgi-bin/details.py?id=24135&t=co&s=4_p36.0xp32.5&name=Cyg%20Rift">Cygnus Rift</a></span>. <small>URL consultato il 5 marzo 2009</small>.</cite></span> </li> <li id="cite_note-3"><a href="#cite_ref-3"><b>^</b></a> <span class="reference-text"><cite class="citation web" style="font-style:normal"> <a rel="nofollow" class="external text" href="http://www.allthesky.com/constellations/cygnus/main.html"><span style="font-style:italic;">Digital Images of the Sky - Constellations</span></a>, su <span style="font-style:italic;">allthesky.com</span>. <small>URL consultato il 5 marzo 2009</small>.</cite></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Bibliografia">Bibliografia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fenditura_del_Cigno&veaction=edit&section=2" title="Modifica la sezione Bibliografia" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Fenditura_del_Cigno&action=edit&section=2" title="Edit section's source code: Bibliografia"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite class="citation web" style="font-style:normal"> Toshimi Taki, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20181105182256/http://www.geocities.jp/toshimi_taki/atlas_85/atlas_85.htm"><span style="font-style:italic;">Taki's 8.5 Magnitude Star Atlas</span></a>, su <span style="font-style:italic;">geocities.jp</span>, 2005. <small>URL consultato il 7 novembre 2010</small> <small>(archiviato dall'<abbr title="http://www.geocities.jp/toshimi_taki/atlas_85/atlas_85.htm">url originale</abbr> il 5 novembre 2018)</small>.</cite> - Atlante celeste liberamente scaricabile in formato PDF.</li> <li>Tirion, Rappaport, Lovi, Uranometria 2000.0, William-Bell inc. <a href="/wiki/Speciale:RicercaISBN/094339614X" class="internal mw-magiclink-isbn">ISBN 0-943396-14-X</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Voci_correlate">Voci correlate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fenditura_del_Cigno&veaction=edit&section=3" title="Modifica la sezione Voci correlate" class="mw-editsection-visualeditor"><span>modifica</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Fenditura_del_Cigno&action=edit&section=3" title="Edit section's source code: Voci correlate"><span>modifica wikitesto</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Complesso_nebuloso_molecolare_del_Cigno" title="Complesso nebuloso molecolare del Cigno">Complesso nebuloso molecolare del Cigno</a></li> <li><a href="/wiki/Fenditura_dell%27Aquila" title="Fenditura dell'Aquila">Fenditura dell'Aquila</a></li> <li><a href="/wiki/Oggetti_non_stellari_nella_costellazione_del_Cigno" title="Oggetti non stellari nella costellazione del Cigno">Oggetti non stellari nella costellazione del Cigno</a></li></ul> <div class="noprint" style="width:100%; 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