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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&de=12.633333333333&size=0.066666666666667&name=Messier+73&object=Messier%2073&_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>
</th></tr>
<tr>
<th colspan="2" style="background:#DCDCDC; color:#202122;">Messier 73
</th></tr>
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<td colspan="2" style="background:#000000 ;color:#FFFFFF; text-align:center; padding:0;"><span typeof="mw:File"></span>
</td></tr>
<tr>
<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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<tr>
<td><a href="Sternbild" title="Sternbild">Sternbild</a>
</td>
<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>
</th></tr>
<tr>
<td><a href="Rektaszension" title="Rektaszension">Rektaszension</a>
</td>
<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>
</td></tr>
<tr>
<td><a href="Deklination_(Astronomie)" title="Deklination (Astronomie)">Deklination</a>
</td>
<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>
</td></tr>
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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> <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>
</p>
</td></tr>
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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>
</td></tr>
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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>
<tr>
<th colspan="2" style="background:#DCDCDC; color:#202122;"><a href="Liste_astronomischer_Kataloge" title="Liste astronomischer Kataloge">Katalogbezeichnungen</a>
</th></tr>
<tr>
<td colspan="2" style="text-align:center;"><a href="Messier-Katalog" title="Messier-Katalog">M</a> 73 • <a href="New_General_Catalogue" title="New General Catalogue">NGC</a> 6994 • C 2056-128 • OCl 89 • <a href="Collinder-Katalog" title="Collinder-Katalog">Cr</a> 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&fov=10.0&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 <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 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 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"> </span>366</span>, 2001, <span style="white-space:nowrap">S.<span style="display:inline-block;width:.2em"> </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&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rfr_id=info:sid/de.wikipedia.org:Messier+73&rft.atitle=Dissolving+star+cluster+candidates&rft.au=E.+Bica%2C+B.+X.+Santiago%2C+C.+M.+Dutra%2C+...&rft.btitle=Astronomy+and+Astrophysics&rft.date=2001&rft.doi=10.1051%2F0004-6361%3A20000248&rft.genre=book&rft.pages=827-833&rft.volume=366" style="display:none"> </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 383, 2002, S. 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&A...383..163O">2002A&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 468, Nr. 1, S. 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&A...468..139P">2007A&A...468..139P</a>.</span>
</li>
</ol>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<div class="sisterproject" style="margin:0.1em 0 0 0;"><div class="noresize noviewer" style="display:inline-block; line-height:10px; min-width:1.6em; text-align:center;" aria-hidden="true" role="presentation"><span class="mw-default-size" typeof="mw:File"><span title="Commons"></span></span></div><b><span class=""><a class="external text" href="https://commons.wikimedia.org/wiki/Messier_73?uselang=de"><span lang="en">Commons</span>: Messier 73</a></span></b> – Album mit Bildern, Videos und Audiodateien</div>
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<div class="klappleiste-kopf"><a href="Messier-Katalog" title="Messier-Katalog">Messierobjekte</a></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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<p><i>Bildauswahl. Bitte das gewünschte Objekt anklicken</i>
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<div class="klappleiste-kopf">Im <a href="New_General_Catalogue" title="New General Catalogue">New General Catalogue</a> (NGC) benachbarte Objekte</div>
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<p><a href="Liste_der_NGC-Objekte" title="Liste der NGC-Objekte">Gesamtliste</a><br>
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<p><a href="NGC_6970" title="NGC 6970">NGC 6970</a> |
<a href="NGC_6971" title="NGC 6971">NGC 6971</a> |
<a href="NGC_6972" title="NGC 6972">NGC 6972</a> |
<a href="NGC_6973" class="mw-redirect" title="NGC 6973">NGC 6973</a> |
<a href="NGC_6974" class="mw-redirect" title="NGC 6974">NGC 6974</a> |
<a href="NGC_6975" title="NGC 6975">NGC 6975</a> |
<a href="NGC_6976" class="mw-redirect" title="NGC 6976">NGC 6976</a> |
<a href="NGC_6977" title="NGC 6977">NGC 6977</a> |
<a href="NGC_6978" title="NGC 6978">NGC 6978</a> |
<a href="NGC_6979" class="mw-redirect" title="NGC 6979">NGC 6979</a> |
<a href="NGC_6980" class="mw-redirect" title="NGC 6980">NGC 6980</a> |
<a href="NGC_6981" class="mw-redirect" title="NGC 6981">NGC 6981</a> |
<a href="NGC_6982" title="NGC 6982">NGC 6982</a> |
<a href="NGC_6983" title="NGC 6983">NGC 6983</a> |
<a href="NGC_6984" title="NGC 6984">NGC 6984</a> |
<a href="NGC_6985" title="NGC 6985">NGC 6985</a> |
<a href="NGC_6986" title="NGC 6986">NGC 6986</a> |
<a href="NGC_6987" title="NGC 6987">NGC 6987</a> |
<a href="NGC_6988" title="NGC 6988">NGC 6988</a> |
<a href="NGC_6989" title="NGC 6989">NGC 6989</a> |
<a href="NGC_6990" title="NGC 6990">NGC 6990</a> |
<a href="NGC_6991" title="NGC 6991">NGC 6991</a> |
<a href="NGC_6992" class="mw-redirect" title="NGC 6992">NGC 6992</a> |
<a href="NGC_6993" title="NGC 6993">NGC 6993</a> |
<b>NGC 6994</b> |
<a href="NGC_6995" class="mw-redirect" title="NGC 6995">NGC 6995</a> |
<a href="NGC_6996" title="NGC 6996">NGC 6996</a> |
<a href="NGC_6997" title="NGC 6997">NGC 6997</a> |
<a href="NGC_6998" title="NGC 6998">NGC 6998</a> |
<a href="NGC_6999" title="NGC 6999">NGC 6999</a> |
<a href="NGC_7000" class="mw-redirect" title="NGC 7000">NGC 7000</a> |
<a href="NGC_7001" title="NGC 7001">NGC 7001</a> |
<a href="NGC_7002" title="NGC 7002">NGC 7002</a> |
<a href="NGC_7003" title="NGC 7003">NGC 7003</a> |
<a href="NGC_7004" title="NGC 7004">NGC 7004</a> |
<a href="NGC_7005" title="NGC 7005">NGC 7005</a> |
<a href="NGC_7006" title="NGC 7006">NGC 7006</a> |
<a href="NGC_7007" title="NGC 7007">NGC 7007</a> |
<a href="NGC_7008" title="NGC 7008">NGC 7008</a> |
<a href="NGC_7009" class="mw-redirect" title="NGC 7009">NGC 7009</a> |
<a href="NGC_7010" title="NGC 7010">NGC 7010</a> |
<a href="NGC_7011" title="NGC 7011">NGC 7011</a> |
<a href="NGC_7012" title="NGC 7012">NGC 7012</a> |
<a href="NGC_7013" title="NGC 7013">NGC 7013</a> |
<a href="NGC_7014" title="NGC 7014">NGC 7014</a> |
<a href="NGC_7015" title="NGC 7015">NGC 7015</a> |
<a href="NGC_7016" title="NGC 7016">NGC 7016</a> |
<a href="NGC_7017" title="NGC 7017">NGC 7017</a> |
<a href="NGC_7018" title="NGC 7018">NGC 7018</a> |
<a href="NGC_7019" title="NGC 7019">NGC 7019</a>
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