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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Messier 55</span></h1>
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</style><div id="coordinates" class="coordinates"><a class="external text" href="https://geohack.toolforge.org/skyhack.php?ra=19.666666666667&de=30.965&size=0.31666666666667&name=Messier+55&_globe:=">Datenbanklinks zu Messier 55</a></div>
<table aria-label="Kenndaten des Kugelsternhaufens" class="wikitable infobox float-right ibtable">
<tbody><tr>
<th colspan="2" class="ibheader"><span style="font-size:110%;">Kugelsternhaufen</span><br>Messier 55
</th></tr>
<tr>
<td colspan="2" class="ibimage notheme"><span typeof="mw:File"></span>
</td></tr>
<tr>
<td colspan="2" class="ibimgtxt notheme">Aufnahme mit dem 3,6-m-Teleskop der ESO am <a href="La-Silla-Observatorium" title="La-Silla-Observatorium">La-Silla-Observatorium</a>
</td></tr>
<tr>
<td colspan="2" style="text-align:center;"><a rel="nofollow" class="external text" href="https://aladin.cds.unistra.fr/AladinLite/?target=19%2040%2000%20%2D30%2057.9%2000&fov=0.31666666666667&survey=CDS%2FP%2FDSS2%2Fcolor">AladinLite</a>
</td></tr>
<tr>
<td class="ibleft"><a href="Sternbild" title="Sternbild">Sternbild</a>
</td>
<td class="ibnowrap"><a href="Sch%C3%BCtze_(Sternbild)" title="Schütze (Sternbild)">Schütze</a>
</td></tr>
<tr>
<th colspan="2" class="ibheader">Position<br><small><a href="%C3%84quinoktium" title="Äquinoktium">Äquinoktium</a>: <a href="Epoche_(Astronomie)#Standardepochen" title="Epoche (Astronomie)">J2000.0</a>, <a href="Epoche_(Astronomie)" title="Epoche (Astronomie)">Epoche</a>: J2000.0</small>
</th></tr>
<tr>
<td class="ibleft"><a href="Rektaszension" title="Rektaszension">Rektaszension</a>
</td>
<td nowrap="">19h 40m 00s <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 class="ibleft"><a href="Deklination_(Astronomie)" title="Deklination (Astronomie)">Deklination</a>
</td>
<td style="white-space:nowrap;">−30° 57.9′ <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>
<th colspan="2" class="ibheader">Erscheinungsbild
</th></tr>
<tr>
<td class="ibleft"><a href="Shapley-Sawyer-Konzentrationsklasse" title="Shapley-Sawyer-Konzentrationsklasse">Konzentrationsklasse</a>
</td>
<td class="ibnowrap">XI <sup id="cite_ref-NED_2-0" class="reference"><a href="#cite_note-NED-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<td class="ibleft"><a href="UBV-System" title="UBV-System">Helligkeit</a> <small>(visuell)</small>
</td>
<td class="ibnowrap">7,42 mag <sup id="cite_ref-simbad_1-1" 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 class="ibleft"><a href="UBV-System" title="UBV-System">Helligkeit</a> <small>(B-Band)</small>
</td>
<td class="ibnowrap">8,12 mag <sup id="cite_ref-simbad_1-2" 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 class="ibleft"><a href="Scheinbare_Gr%C3%B6%C3%9Fe" title="Scheinbare Größe">Winkelausdehnung</a>
</td>
<td class="ibnowrap">19′ <sup id="cite_ref-seds_3-0" class="reference"><a href="#cite_note-seds-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr style="display:none;">
<td class="ibleft"><a href="Scheinbare_Gr%C3%B6%C3%9Fe" title="Scheinbare Größe">Winkelausdehnung</a>
</td>
<td class="ibnowrap">0′ × 0′
</td></tr>
<tr style="display:none;">
<td class="ibleft"><a href="Fl%C3%A4chenhelligkeit" title="Flächenhelligkeit">Flächenhelligkeit</a>
</td>
<td class="ibnowrap"> mag/arcmin²
</td></tr>
<tr>
<td class="ibleft"><a href="Farben-Helligkeits-Diagramm" title="Farben-Helligkeits-Diagramm">Farbexzess</a><br> E(B-V) (Rötung)
</td>
<td class="ibnowrap">0,07
</td></tr>
<tr>
<th colspan="2" class="ibheader">Physikalische Daten
</th></tr>
<tr>
<td class="ibleft"><a href="Galaxie" title="Galaxie">Zugehörigkeit</a>
</td>
<td class="ibnowrap"><a href="Milchstra%C3%9Fe" title="Milchstraße">Milchstraße</a>
</td></tr>
<tr>
<td class="ibleft">Integrierter Spektraltyp
</td>
<td class="ibnowrap">F4
</td></tr>
<tr>
<td class="ibleft"><a href="Rotverschiebung" title="Rotverschiebung">Rotverschiebung</a>
</td>
<td class="ibnowrap">+0,000584 ± 0,000001 <sup id="cite_ref-simbad_1-3" 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 class="ibleft"><a href="Radialgeschwindigkeit" title="Radialgeschwindigkeit">Radialgeschwindigkeit</a>
</td>
<td class="ibnowrap">(+174,9 ± 0,4) km/s <sup id="cite_ref-simbad_1-3" 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 class="ibleft">Entfernung
</td>
<td class="ibnowrap">17,3 <a href="Lichtjahr" title="Lichtjahr">kLj</a><br><small>(5,3 <a href="Parsec" title="Parsec">kpc</a>)</small> <sup id="cite_ref-seds_3-1" class="reference"><a href="#cite_note-seds-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr style="display:none;">
<td class="ibleft"><a href="Absolute_Helligkeit" title="Absolute Helligkeit">Absolute Helligkeit</a>
</td>
<td class="ibnowrap">mag
</td></tr>
<tr style="display:none;">
<td class="ibleft"><a href="Masse_(Physik)" title="Masse (Physik)">Masse</a>
</td>
<td class="ibnowrap"><a href="Sonnenmasse" title="Sonnenmasse">M<sub>☉</sub></a>
</td></tr>
<tr>
<td class="ibleft"><a href="Durchmesser" title="Durchmesser">Durchmesser</a>
</td>
<td class="ibnowrap">100 Lj <sup id="cite_ref-apod_4-0" class="reference"><a href="#cite_note-apod-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr style="display:none;">
<td class="ibleft">Kernradius
</td>
<td class="ibnowrap">{{{Kernradius}}}
</td></tr>
<tr style="display:none;">
<td class="ibleft">Gezeitenradius
</td>
<td class="ibnowrap">
</td></tr>
<tr>
<td class="ibleft">Konzentration lg(r<sub>t</sub>/r<sub>c</sub>)
</td>
<td class="ibnowrap">0,76
</td></tr>
<tr style="display:none;">
<td class="ibleft">Alter
</td>
<td class="ibnowrap"><a href="Jahr" title="Jahr">Jahre</a>
</td></tr>
<tr>
<td class="ibleft"><a href="Metallizit%C3%A4t" title="Metallizität">Metallizität</a> [Fe/H]
</td>
<td class="ibnowrap">−1,81
</td></tr>
<tr>
<th colspan="2" class="ibheader"><a href="Liste_der_Entdecker_der_NGC-_und_IC-Objekte" title="Liste der Entdecker der NGC- und IC-Objekte">Geschichte</a>
</th></tr>
<tr>
<td class="ibleft">Entdeckung
</td>
<td class="ibnowrap"><a href="Nicolas_Louis_de_Lacaille" class="mw-redirect" title="Nicolas Louis de Lacaille">Nicolas Louis de Lacaille</a>
</td></tr>
<tr>
<td class="ibleft">Entdeckungsdatum
</td>
<td class="ibnowrap">1751<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>
</td></tr>
<tr>
<th colspan="2" class="ibheader"><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> 55 • <a href="New_General_Catalogue" title="New General Catalogue">NGC</a> 6809 • C 1936-310 • <a href="Liste_astronomischer_Kataloge" title="Liste astronomischer Kataloge">GCl</a> 113 •
</td></tr></tbody></table>
<p><b><a href="Messier-Katalog" title="Messier-Katalog">Messier</a> 55</b> (auch als <b><a href="New_General_Catalogue" title="New General Catalogue">NGC</a> 6809</b> bezeichnet) ist ein 7,4 <a href="Scheinbare_Helligkeit" title="Scheinbare Helligkeit">mag</a> heller <a href="Kugelsternhaufen" title="Kugelsternhaufen">Kugelsternhaufen</a> mit einer Winkelausdehnung von 19′ im <a href="Sternbild" title="Sternbild">Sternbild</a> <a href="Sch%C3%BCtze_(Sternbild)" title="Schütze (Sternbild)">Schütze</a>. Sein Durchmesser beträgt rund 100 <a href="Lichtjahr" title="Lichtjahr">Lichtjahre</a> und er ist etwa 17.000 Lichtjahre von uns entfernt.
</p><p>Die 100.000 Sterne, aus denen Messier 55 besteht, kommen zusammen auf etwa 270.000 <a href="Sonnenmasse" title="Sonnenmasse">Sonnenmassen</a>.<sup id="cite_ref-apod_4-1" class="reference"><a href="#cite_note-apod-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Besonders ist an diesen Sternen nicht nur, dass sie in einem vergleichsweise kleinen Volumen zusammengedrängt sind, sie zählen auch mit ihren rund zehn Milliarden Jahren zu den <a href="Population_II" class="mw-redirect" title="Population II">ältesten Sternen</a> im Universum. Sie entstanden nahezu gleichzeitig aus einer Gaswolke in der Frühzeit unserer <a href="Milchstra%C3%9Fe" title="Milchstraße">Milchstraße</a> und bestehen hauptsächlich aus <a href="Wasserstoff" title="Wasserstoff">Wasserstoff</a> und <a href="Helium" title="Helium">Helium</a>. Schwerere Elemente wie <a href="Sauerstoff" title="Sauerstoff">Sauerstoff</a> und <a href="Stickstoff" title="Stickstoff">Stickstoff</a> waren zu der Zeit wesentlich seltener als heute.
</p><p>Wegen seiner südlichen Position ist dieser Sternhaufen von Mitteleuropa aus schwer zu finden.
</p><p>Die ersten dokumentierten Beobachtungen dieses Himmelsobjekts stammen aus dem Jahr 1751 vom französischen Astronomen <a href="Nicolas_Louis_de_Lacaille" class="mw-redirect" title="Nicolas Louis de Lacaille">Nicolas Louis de Lacaille</a>. <a href="Charles_Messier" title="Charles Messier">Charles Messier</a> übernahm den Sternhaufen 26 Jahre später in seinen Katalog.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>
</p>
<ul class="gallery mw-gallery-traditional">
<li class="gallerybox" style="width: 155px">
<div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"></span></div>
<div class="gallerytext">Infrarotaufnahme mit <a href="VISTA" class="mw-redirect" title="VISTA">VISTA</a></div>
</li>
</ul>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://www.maa.clell.de/Messier/E/m055.html">M55 bei SEDS</a> (englisch)</li>
<li>ESO: <a rel="nofollow" class="external text" href="https://www.eso.org/public/germany/news/eso1220/">VISTA wirft einen Blick auf einen gigantischen Ball aus Sternen</a> 9. Mai 2012</li>
<li>astronews.de: <a rel="nofollow" class="external text" href="https://www.astronews.com/bilddestages/2013/20131009.shtml">Bild des Tages</a> 9. Oktober 2013</li>
<li><a href="Spektrum.de" title="Spektrum.de">Spektrum.de</a>: Amateuraufnahmen <a rel="nofollow" class="external autonumber" href="https://www.spektrum.de/alias/wunder-des-weltalls/kugelsternhaufen-messier-55/1548213">[1]</a></li></ul>
<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">↑ <sup><a href="#cite_ref-simbad_1-0">a</a></sup> <sup><a href="#cite_ref-simbad_1-1">b</a></sup> <sup><a href="#cite_ref-simbad_1-2">c</a></sup> <sup><a href="#cite_ref-simbad_1-3">d</a></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://simbad.u-strasbg.fr/simbad/sim-id?Ident=MESSIER+055">SIMBAD</a></span>
</li>
<li id="cite_note-NED-2"><span class="mw-cite-backlink"><a href="#cite_ref-NED_2-0">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://messier.seds.org/xtra/supp/m_NED.html#m55">NED data for the Messier Objects</a></span>
</li>
<li id="cite_note-seds-3"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-seds_3-0">a</a></sup> <sup><a href="#cite_ref-seds_3-1">b</a></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://messier.seds.org/m/m055.html">SEDS</a></span>
</li>
<li id="cite_note-apod-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-apod_4-0">a</a></sup> <sup><a href="#cite_ref-apod_4-1">b</a></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://apod.nasa.gov/apod/ap040918.html">M55: Globular Star Cluster </a> (<a href="Astronomy_Picture_of_the_Day" title="Astronomy Picture of the Day">Astronomy Picture of the Day</a> vom 18. September 2004)</span>
</li>
<li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://cseligman.com/text/atlas/ngc68.htm#6809">https://cseligman.com/text/atlas/ngc68.htm#6809</a></span>
</li>
<li id="cite_note-6"><span class="mw-cite-backlink"><a href="#cite_ref-6">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external free" href="https://www.eso.org/public/germany/news/eso1220/">https://www.eso.org/public/germany/news/eso1220/</a></span>
</li>
<li id="cite_note-7"><span class="mw-cite-backlink"><a href="#cite_ref-7">↑</a></span> <span class="reference-text">Benjamin Knispel: Sternenball im Schützen; in: <a href="Sterne_und_Weltraum" title="Sterne und Weltraum">Sterne und Weltraum</a>, Juli 2012, S. 12</span>
</li>
</ol>
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<tbody><tr><td>Vorgänger im Katalog: <b><a href="Messier_54" title="Messier 54">M 54</a></b></td><td>Messier 55</td><td>Nachfolger im Katalog: <b><a href="Messier_56" title="Messier 56">M 56</a></b></td></tr></tbody></table>
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<p><i>Bildauswahl. Bitte das gewünschte Objekt anklicken</i>
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<div style="position:absolute; left:348px; top:411px; line-height:110%;"><div style="; #202122; transform:translate(0%, 0% );"><span typeof="mw:File"></span></div></div>
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<div class="klappleiste mw-collapsible navileiste navigation-not-searchable center" role="navigation">
<div class="klappleiste-kopf">Im <a href="New_General_Catalogue" title="New General Catalogue">New General Catalogue</a> (NGC) benachbarte Objekte</div>
<div class="klappleiste-inhalt mw-collapsible-content">
<p><a href="Liste_der_NGC-Objekte" title="Liste der NGC-Objekte">Gesamtliste</a><br>
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<p><a href="NGC_6785" class="mw-redirect" title="NGC 6785">NGC 6785</a> |
<a href="NGC_6786" title="NGC 6786">NGC 6786</a> |
<a href="NGC_6787" title="NGC 6787">NGC 6787</a> |
<a href="NGC_6788" title="NGC 6788">NGC 6788</a> |
<a href="NGC_6789" title="NGC 6789">NGC 6789</a> |
<a href="NGC_6790" title="NGC 6790">NGC 6790</a> |
<a href="NGC_6791" title="NGC 6791">NGC 6791</a> |
<a href="NGC_6792" title="NGC 6792">NGC 6792</a> |
<a href="NGC_6793" title="NGC 6793">NGC 6793</a> |
<a href="NGC_6794" title="NGC 6794">NGC 6794</a> |
<a href="NGC_6795" title="NGC 6795">NGC 6795</a> |
<a href="NGC_6796" title="NGC 6796">NGC 6796</a> |
<a href="NGC_6797" class="mw-redirect" title="NGC 6797">NGC 6797</a> |
<a href="NGC_6798" title="NGC 6798">NGC 6798</a> |
<a href="NGC_6799" title="NGC 6799">NGC 6799</a> |
<a href="NGC_6800" title="NGC 6800">NGC 6800</a> |
<a href="NGC_6801" title="NGC 6801">NGC 6801</a> |
<a href="NGC_6802" title="NGC 6802">NGC 6802</a> |
<a href="NGC_6803" title="NGC 6803">NGC 6803</a> |
<a href="NGC_6804" title="NGC 6804">NGC 6804</a> |
<a href="NGC_6805" title="NGC 6805">NGC 6805</a> |
<a href="NGC_6806" title="NGC 6806">NGC 6806</a> |
<a href="NGC_6807" title="NGC 6807">NGC 6807</a> |
<a href="NGC_6808" title="NGC 6808">NGC 6808</a> |
<b>NGC 6809</b> |
<a href="NGC_6810" title="NGC 6810">NGC 6810</a> |
<a href="NGC_6811" title="NGC 6811">NGC 6811</a> |
<a href="NGC_6812" title="NGC 6812">NGC 6812</a> |
<a href="NGC_6813" title="NGC 6813">NGC 6813</a> |
<a href="NGC_6814" title="NGC 6814">NGC 6814</a> |
<a href="NGC_6815" title="NGC 6815">NGC 6815</a> |
<a href="NGC_6816" title="NGC 6816">NGC 6816</a> |
<a href="NGC_6817" title="NGC 6817">NGC 6817</a> |
<a href="NGC_6818" title="NGC 6818">NGC 6818</a> |
<a href="NGC_6819" title="NGC 6819">NGC 6819</a> |
<a href="NGC_6820" title="NGC 6820">NGC 6820</a> |
<a href="NGC_6821" title="NGC 6821">NGC 6821</a> |
<a href="NGC_6822" class="mw-redirect" title="NGC 6822">NGC 6822</a> |
<a href="NGC_6823" title="NGC 6823">NGC 6823</a> |
<a href="NGC_6824" title="NGC 6824">NGC 6824</a> |
<a href="NGC_6825" title="NGC 6825">NGC 6825</a> |
<a href="NGC_6826" title="NGC 6826">NGC 6826</a> |
<a href="NGC_6827" title="NGC 6827">NGC 6827</a> |
<a href="NGC_6828" title="NGC 6828">NGC 6828</a> |
<a href="NGC_6829" title="NGC 6829">NGC 6829</a> |
<a href="NGC_6830" title="NGC 6830">NGC 6830</a> |
<a href="NGC_6831" title="NGC 6831">NGC 6831</a> |
<a href="NGC_6832" title="NGC 6832">NGC 6832</a> |
<a href="NGC_6833" title="NGC 6833">NGC 6833</a> |
<a href="NGC_6834" title="NGC 6834">NGC 6834</a>
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