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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Messier 73</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><div id="coordinates" class="coordinates"><a class="external text" href="https://geohack.toolforge.org/skyhack.php?ra=20.983333333333&amp;de=12.633333333333&amp;size=0.066666666666667&amp;name=Messier+73&amp;object=Messier%2073&amp;_globe:=">Datenbanklinks zu Messier 73</a></div>
<table aria-label="Kenndaten des astronomisches Objekts" class="wikitable infobox float-right" id="infobox_astronomisches_objekt" style="font-size:90%; min-width:15%; width:310px; max-width:67%;">

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<th colspan="2" style="background:#D3D3D3; color:#202122; font-size:larger;"><a href="Sternbild" title="Sternbild">Asterismus</a>
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<th colspan="2" style="background:#DCDCDC; color:#202122;">Messier 73
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<td colspan="2" style="background:#000000 ;color:#FFFFFF; text-align:center; padding:0;"><span typeof="mw:File"></span>
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<td colspan="2" style="background:#DCDCDC; color:#202122; text-align:center;"><a href="Two_Micron_All_Sky_Survey" title="Two Micron All Sky Survey">2MASS-Aufnahme</a> von Messier 73
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<td><a href="Sternbild" title="Sternbild">Sternbild</a>
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<td nowrap=""><a href="Wassermann_(Sternbild)" title="Wassermann (Sternbild)">Wassermann</a>
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<th colspan="2" style="background:#DCDCDC; color:#202122;">Position<br><small><a href="%C3%84quinoktium" title="Äquinoktium">Äquinoktium</a>: <a href="J2000.0" class="mw-redirect" title="J2000.0">J2000.0</a></small>
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<td><a href="Rektaszension" title="Rektaszension">Rektaszension</a>
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<td nowrap="">20h 59m <sup id="cite_ref-SIMBAD_1-0" class="reference"><a href="#cite_note-SIMBAD-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<td><a href="Deklination_(Astronomie)" title="Deklination (Astronomie)">Deklination</a>
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<td nowrap="">−12° 38′ <sup id="cite_ref-SIMBAD_1-0" class="reference"><a href="#cite_note-SIMBAD-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<th colspan="2" style="background:#DCDCDC; color:#202122;">Weitere Daten
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<td><a href="Scheinbare_Helligkeit" title="Scheinbare Helligkeit">Helligkeit</a>&nbsp;<small>(visuell)</small>
</td>
<td nowrap="">
<p>9,0 mag<sup id="cite_ref-SEDS_2-0" class="reference"><a href="#cite_note-SEDS-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
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<td><a href="Scheinbare_Gr%C3%B6%C3%9Fe" title="Scheinbare Größe">Winkelausdehnung</a>
</td>
<td nowrap="">
<p>2,8'<sup id="cite_ref-SEDS_2-1" class="reference"><a href="#cite_note-SEDS-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
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<th colspan="2" style="background:#DCDCDC; color:#202122;">Geschichte
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<td>Entdeckung
</td>
<td nowrap="">
<p><a href="Charles_Messier" title="Charles Messier">Charles Messier</a>
</p>
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<td>Datum der Entdeckung
</td>
<td nowrap="">
<p>4. Oktober 1780<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>
</td></tr>
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<th colspan="2" style="background:#DCDCDC; color:#202122;"><a href="Liste_astronomischer_Kataloge" title="Liste astronomischer Kataloge">Katalogbezeichnungen</a>
</th></tr>
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<td colspan="2" style="text-align:center;"><a href="Messier-Katalog" title="Messier-Katalog">M</a>&nbsp;73&nbsp;• <a href="New_General_Catalogue" title="New General Catalogue">NGC</a>&nbsp;6994&nbsp;• C&nbsp;2056-128&nbsp;• OCl&nbsp;89&nbsp;• <a href="Collinder-Katalog" title="Collinder-Katalog">Cr</a>&nbsp;426
</td></tr>


<tr>
<td colspan="2" style="white-space:nowrap;"><a rel="nofollow" class="external text" href="https://aladin.cds.unistra.fr/AladinLite/?target=20%2059%2000%20%2D12%2038%2000&amp;fov=10.0&amp;survey=CDS%2FP%2FDSS2%2Fcolor">AladinLite</a>
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<p><b>Messier 73</b> (auch als <b>NGC 6994</b> bezeichnet) ist eine +9,0&nbsp;<a href="Scheinbare_Helligkeit" title="Scheinbare Helligkeit">mag</a> helle, zufällige Anordnung von Sternen, ein Sternmuster oder <a href="Asterismus_(Astronomie)" class="mw-redirect" title="Asterismus (Astronomie)">Asterismus</a>, mit einer Winkelausdehnung von 2,8' im <a href="Sternbild" title="Sternbild">Sternbild</a> <a href="Wassermann_(Sternbild)" title="Wassermann (Sternbild)">Wassermann</a>.
</p><p>Lange Zeit war nicht geklärt, ob es sich bei Messier&nbsp;73 um einen „richtigen“ offenen Sternhaufen handelt, also eine Gruppe von physikalisch gebundenen Sternen, oder nur um ein zufälliges Muster.<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> Mittlerweile konnte durch Messung der Eigenbewegungen und Radialgeschwindigkeiten nachgewiesen werden, dass es sich bei Messier&nbsp;73 weder um einen offenen Sternhaufen noch um den Überrest eines solchen handelt, sondern um eine zufällige Fluktuation der Sterndichte auf dieser Sichtlinie.<sup id="cite_ref-OdenkirchenSoubiran2002_5-0" class="reference"><a href="#cite_note-OdenkirchenSoubiran2002-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-PavaniBica2007_6-0" class="reference"><a href="#cite_note-PavaniBica2007-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-SIMBAD-1"><span class="mw-cite-backlink"><a href="#cite_ref-SIMBAD_1-0">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Messier%2073">SIMBAD</a></span>
</li>
<li id="cite_note-SEDS-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-SEDS_2-0">a</a></sup> <sup><a href="#cite_ref-SEDS_2-1">b</a></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://messier.seds.org/m/m073.html">Messier 73 bei SEDS</a></span>
</li>
<li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://cseligman.com/text/atlas/ngc69a.htm#6994">https://cseligman.com/text/atlas/ngc69a.htm#6994</a></span>
</li>
<li id="cite_note-4"><span class="mw-cite-backlink"><a href="#cite_ref-4">↑</a></span> <span class="reference-text">E. Bica, B. X. Santiago, C. M. Dutra, H. Dottori, M. R. de Oliveira, D. Pavani: <cite style="font-style:italic">Dissolving star cluster candidates</cite>. In: <cite style="font-style:italic">Astronomy and Astrophysics</cite>. <span style="white-space:nowrap">Band<span style="display:inline-block;width:.2em">&nbsp;</span>366</span>, 2001, <span style="white-space:nowrap">S.<span style="display:inline-block;width:.2em">&nbsp;</span>827–833</span>, <a href="Digital_Object_Identifier" title="Digital Object Identifier">doi</a>:<span class="uri-handle" style="white-space:nowrap"><a rel="nofollow" class="external text" href="https://doi.org/10.1051/0004-6361%3A20000248">10.1051/0004-6361:20000248</a></span>.<span class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rfr_id=info:sid/de.wikipedia.org:Messier+73&amp;rft.atitle=Dissolving+star+cluster+candidates&amp;rft.au=E.+Bica%2C+B.+X.+Santiago%2C+C.+M.+Dutra%2C+...&amp;rft.btitle=Astronomy+and+Astrophysics&amp;rft.date=2001&amp;rft.doi=10.1051%2F0004-6361%3A20000248&amp;rft.genre=book&amp;rft.pages=827-833&amp;rft.volume=366" style="display:none">&nbsp;</span></span>
</li>
<li id="cite_note-OdenkirchenSoubiran2002-5"><span class="mw-cite-backlink"><a href="#cite_ref-OdenkirchenSoubiran2002_5-0">↑</a></span> <span class="reference-text">M. Odenkirchen, C. Soubiran: <i>NGC 6994 – clearly not a physical stellar ensemble.</i> In: <i>Astronomy and Astrophysics.</i> Band&nbsp;383, 2002, S.&nbsp;163–170, <a href="https://doi.org/10.1051/0004-6361:20011730" class="extiw external" title="doi:10.1051/0004-6361:20011730">DOI:10.1051/0004-6361:20011730</a>, <a href="Bibcode" title="Bibcode">bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2002A&amp;A...383..163O">2002A&amp;A...383..163O</a>.</span>
</li>
<li id="cite_note-PavaniBica2007-6"><span class="mw-cite-backlink"><a href="#cite_ref-PavaniBica2007_6-0">↑</a></span> <span class="reference-text">D. B. Pavani, E. Bica: <i>Characterization of open cluster remnants.</i> In: <i>Astronomy and Astrophysics.</i> Band&nbsp;468, Nr.&nbsp;1, S.&nbsp;139–150, <a href="https://doi.org/10.1051/0004-6361:20066240" class="extiw external" title="doi:10.1051/0004-6361:20066240">DOI:10.1051/0004-6361:20066240</a>, <a href="Bibcode" title="Bibcode">bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2007A&amp;A...468..139P">2007A&amp;A...468..139P</a>.</span>
</li>
</ol>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
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<tbody><tr><td>Vorgänger im Katalog: <b><a href="Messier_72" title="Messier 72">M 72</a></b></td><td>Messier 73</td><td>Nachfolger im Katalog: <b><a href="Messier_74" title="Messier 74">M 74</a></b></td></tr></tbody></table>
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