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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Delta Ursae Minoris</span></h1>
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</style><div id="coordinates" class="coordinates"><a class="external text" href="https://geohack.toolforge.org/skyhack.php?ra=17.536944444444&de=86.586388888889&size=0.016666666666667&name=%CE%B4+Ursae+Minoris&object=Delta%20Ursae%20Minoris&_globe:=">Datenbanklinks zu δ Ursae Minoris</a></div>
<table aria-label="Kenndaten des Sterns" class="wikitable infobox hintergrundfarbe-basis float-right ibtable">
<tbody><tr>
<th colspan="2" class="ibheader"><a href="Stern" title="Stern">Stern</a><br> δ Ursae Minoris
</th></tr>
<tr>
<td colspan="2" class="notheme ibimage"><div style="position:relative;width:300px;margin:0 auto;"><span typeof="mw:File"></span><div style="position: absolute;left:120px;top:42px;"><span typeof="mw:File"></span></div></div>
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<tr style="display:none;">
<td colspan="2" class="ibimgtxt">
</td></tr>
<tr>
<td colspan="2" class="ibmap notheme"><div class="notheme" style="position: relative; width: 330px; margin: auto; float: ; clear: ; background:#ffffff;"><div style="position: absolute; left: 139px; top: 90px; padding: 0;"><span class="mw-valign-top" typeof="mw:File"></span></div><span typeof="mw:File"></span></div>
</td></tr>
<tr style="display:none;">
<td colspan="2" class="ibmaptxt notheme">{{{Kartentext}}}
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<tr>
<td colspan="2" style="text-align:center;"><a rel="nofollow" class="external text" href="https://aladin.cds.unistra.fr/AladinLite/?target=17%2032%2013.0%20%2B86%2035%2011&fov=0.016666666666667&survey=CDS%2FP%2FDSS2%2Fcolor">AladinLite</a>
</td></tr>
<tr>
<th colspan="2" class="ibheader">Beobachtungsdaten<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><a href="Sternbild" title="Sternbild">Sternbild</a>
</td>
<td class="ibnowrap"><a href="Kleiner_B%C3%A4r" title="Kleiner Bär">Kleiner Bär</a>
</td></tr>
<tr>
<td><a href="Rektaszension" title="Rektaszension">Rektaszension</a>
</td>
<td class="ibnowrap">17h 32m 13,0s
</td></tr>
<tr>
<td><a href="Deklination_(Astronomie)" title="Deklination (Astronomie)">Deklination</a>
</td>
<td class="ibnowrap">+86° 35′ 11″
</td></tr>
<tr style="display:none;">
<td><a href="Scheinbare_Gr%C3%B6%C3%9Fe" title="Scheinbare Größe">Winkelausdehnung</a>
</td>
<td class="ibnowrap">{{{Winkel}}} <a href="Winkelsekunde" title="Winkelsekunde">mas</a>
</td></tr>
<tr style="display:none;">
<td>Bekannte <a href="Exoplanet" title="Exoplanet">Exoplaneten</a>
</td>
<td class="ibnowrap">{{{Planeten}}}
</td></tr>
<tr>
<th colspan="2" class="ibheader">Helligkeiten
</th></tr>
<tr>
<td><a href="Scheinbare_Helligkeit" title="Scheinbare Helligkeit">Scheinbare Helligkeit</a>
</td>
<td class="ibnowrap">4,3 mag
</td></tr>
<tr style="display:none;">
<td><a href="UBV-System" title="UBV-System">Helligkeit (U-Band)</a>
</td>
<td class="ibnowrap">{{{magU}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="UBV-System" title="UBV-System">Helligkeit (B-Band)</a>
</td>
<td class="ibnowrap">{{{magB}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="UBV-System" title="UBV-System">Helligkeit (V-Band)</a>
</td>
<td class="ibnowrap">{{{magV}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="UBV-System#Erweiterungen" title="UBV-System">Helligkeit (R-Band)</a>
</td>
<td class="ibnowrap">{{{magR}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="UBV-System#Erweiterungen" title="UBV-System">Helligkeit (I-Band)</a>
</td>
<td class="ibnowrap">{{{magI}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="Frequenzband#Astronomie" title="Frequenzband">Helligkeit (J-Band)</a>
</td>
<td class="ibnowrap">{{{magJ}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="Frequenzband#Astronomie" title="Frequenzband">Helligkeit (H-Band)</a>
</td>
<td class="ibnowrap">{{{magH}}} mag
</td></tr>
<tr style="display:none;">
<td><a href="Frequenzband#Astronomie" title="Frequenzband">Helligkeit (K-Band)</a>
</td>
<td class="ibnowrap"> mag
</td></tr>
<tr style="display:none;">
<td><a href="G-Band-Magnitude" title="G-Band-Magnitude">G-Band-Magnitude</a>
</td>
<td class="ibnowrap"> mag
</td></tr>
<tr>
<th colspan="2" class="ibheader">Spektrum und Indices
</th></tr>
<tr style="display:none;">
<td><a href="Benennung_ver%C3%A4nderlicher_Sterne" title="Benennung veränderlicher Sterne">Veränderlicher Sterntyp</a>
</td>
<td class="ibnowrap">
</td></tr>
<tr style="display:none;">
<td>B−V-Farbindex
</td>
<td class="ibnowrap">
</td></tr>
<tr style="display:none;">
<td>U−B-<a href="Farbindex" title="Farbindex">Farbindex</a>
</td>
<td class="ibnowrap">
</td></tr>
<tr style="display:none;">
<td>R−I-Index
</td>
<td class="ibnowrap">
</td></tr>
<tr>
<td><a href="Spektralklasse" title="Spektralklasse">Spektralklasse</a>
</td>
<td class="ibnowrap">A1 Vn
</td></tr>
<tr>
<th colspan="2" class="ibheader"><a href="Astrometrie" title="Astrometrie">Astrometrie</a>
</th></tr>
<tr style="display:none;">
<td><a href="Radialgeschwindigkeit" title="Radialgeschwindigkeit">Radialgeschwindigkeit</a>
</td>
<td class="ibnowrap"> km/s
</td></tr>
<tr>
<td><a href="Parallaxe" title="Parallaxe">Parallaxe</a>
</td>
<td class="ibnowrap">(17,85 ± 0,48) <a href="Winkelsekunde" title="Winkelsekunde">mas</a>
</td></tr>
<tr>
<td>Entfernung
</td>
<td class="ibnowrap">(183 ± 5) <a href="Lichtjahr" title="Lichtjahr">Lj</a><br>(56,0 ± 1,5) <a href="Parsec" title="Parsec">pc</a>
</td></tr>
<tr style="display:none;">
<td>Visuelle <a href="Absolute_Helligkeit" title="Absolute Helligkeit">Absolute Helligkeit</a> M<sub>vis</sub>
</td>
<td class="ibnowrap"> mag
</td></tr>
<tr style="display:none;">
<td>Bolometrische <a href="Absolute_Helligkeit" title="Absolute Helligkeit">Absolute Helligkeit</a> M<sub>bol</sub>
</td>
<td class="ibnowrap">{{{Absolut-bol}}} mag
</td></tr>
<tr style="display:none;">
<th colspan="2" class="ibheader"><a href="Eigenbewegung_(Astronomie)" title="Eigenbewegung (Astronomie)">Eigenbewegung</a>
</th></tr>
<tr style="display:none;">
<td>Rek.-Anteil:
</td>
<td class="ibnowrap"> <a href="Winkelsekunde" title="Winkelsekunde">mas</a>/<a href="Jahr" title="Jahr">a</a>
</td></tr>
<tr style="display:none;">
<td>Dekl.-Anteil:
</td>
<td class="ibnowrap"> <a href="Winkelsekunde" title="Winkelsekunde">mas</a>/<a href="Jahr" title="Jahr">a</a>
</td></tr>
<tr>
<th colspan="2" class="ibheader">Physikalische Eigenschaften
</th></tr>
<tr>
<td><a href="Masse_(Physik)" title="Masse (Physik)">Masse</a>
</td>
<td class="ibnowrap">2,35 <a href="Sonnenmasse" title="Sonnenmasse"><i>M</i><sub>☉</sub></a>
</td></tr>
<tr>
<td><a href="Radius" title="Radius">Radius</a>
</td>
<td class="ibnowrap">2,8 <a href="Sonnenradius" title="Sonnenradius"><i>R</i><sub>☉</sub></a>
</td></tr>
<tr>
<td><a href="Leuchtkraft" title="Leuchtkraft">Leuchtkraft</a>
</td>
<td class="ibnowrap">
<p>47,77 <a href="Sonnenleuchtkraft" title="Sonnenleuchtkraft"><i>L</i><sub>☉</sub></a>
</p>
</td></tr>
<tr>
<td><a href="Effektive_Temperatur" title="Effektive Temperatur">Effektive Temperatur</a>
</td>
<td class="ibnowrap">9911 ± 337 <a href="Kelvin" title="Kelvin">K</a>
</td></tr>
<tr style="display:none;">
<td><a href="Metallizit%C3%A4t" title="Metallizität">Metallizität</a> [Fe/H]
</td>
<td class="ibnowrap">
</td></tr>
<tr>
<td><a href="Sternrotation" title="Sternrotation">Rotationsdauer</a>
</td>
<td class="ibnowrap">19 h
</td></tr>
<tr style="display:none;">
<td>Alter
</td>
<td class="ibnowrap"> <a href="Jahr" title="Jahr">a</a>
</td></tr>
<tr>
<th colspan="2" class="ibheader">Andere Bezeichnungen und <a href="Liste_astronomischer_Kataloge" title="Liste astronomischer Kataloge">Katalogeinträge</a>
</th></tr>
<tr>
<td colspan="2"><table class="centered" style="width:100%; border:none; font-size:smaller; margin:0 .2em; white-space:nowrap; line-height:1.3em;"><tbody><tr><td style="white-space:nowrap;"><a href="Bayer-Bezeichnung" title="Bayer-Bezeichnung">Bayer-Bezeichnung</a></td><td style="white-space:nowrap;">δ Ursae Minoris</td></tr><tr><td style="white-space:nowrap;"><a href="Flamsteed-Bezeichnung" title="Flamsteed-Bezeichnung">Flamsteed-Bezeichnung</a></td><td style="white-space:nowrap;">23 Ursae Minoris</td></tr><tr><td style="white-space:nowrap;"><a href="Bonner_Durchmusterung" title="Bonner Durchmusterung">Bonner Durchmusterung</a></td><td style="white-space:nowrap;">BD +86° 269</td></tr><tr><td style="white-space:nowrap;"><a href="Bright-Star-Katalog" title="Bright-Star-Katalog">Bright-Star-Katalog</a> </td><td style="white-space:nowrap;">HR 6789 <a rel="nofollow" class="external autonumber" href="https://cdsarc.u-strasbg.fr/viz-bin/VizieR-5?-source=V/50&-out.all&-out.max=10&HR==6789">[1]</a></td></tr><tr><td style="white-space:nowrap;"><a href="Henry-Draper-Katalog" title="Henry-Draper-Katalog">Henry-Draper-Katalog</a></td><td style="white-space:nowrap;">HD 166205 <a rel="nofollow" class="external autonumber" href="https://cdsarc.u-strasbg.fr/viz-bin/VizieR-5?-source=III/135A/catalog&-out.all&-out.max=10&HD==166205">[2]</a></td></tr><tr><td style="white-space:nowrap;"><a href="Hipparcos-Katalog" title="Hipparcos-Katalog">Hipparcos-Katalog</a></td><td style="white-space:nowrap;">HIP 85822 <a rel="nofollow" class="external autonumber" href="https://vizier.u-strasbg.fr/viz-bin/VizieR-5?-source=I/311&-out.all&-out.max=10&HIP==85822">[3]</a></td></tr><tr><td style="white-space:nowrap;"><a href="SAO-Katalog" title="SAO-Katalog">SAO-Katalog</a></td><td style="white-space:nowrap;">SAO 2937 <a rel="nofollow" class="external autonumber" href="https://cdsarc.u-strasbg.fr/viz-bin/VizieR-5?-source=I/131A/sao&-out.all&-out.max=10&SAO==2937">[4]</a></td></tr><tr><td style="white-space:nowrap;"><a href="Tycho-1-Katalog" title="Tycho-1-Katalog">Tycho-Katalog</a></td><td style="white-space:nowrap;">TYC 4655-1053-1<a rel="nofollow" class="external autonumber" href="https://cdsarc.u-strasbg.fr/viz-bin/VizieR-5?-source=I/259&-out.all&-out.max=100&TYC1=4655&TYC2=1053&TYC3=1">[5]</a></td></tr><tr><td style="white-space:nowrap; vertical-align:top; padding-top:0.2em;">Weitere Bezeichnungen</td><td style="white-space:normal;">
<a href="FK5" title="FK5">FK5</a> 913</td></tr></tbody></table>
</td></tr>
<tr style="display:none;">
<th colspan="2" class="ibheader">Anmerkung
</th></tr>
<tr style="display:none;">
<td colspan="2">{{{Anmerkung}}}
</td></tr></tbody></table>
<p><b>δ Ursae Minoris</b> (Delta Ursae Minoris, kurz <i>δ UMi</i>) ist ein circa 180 <a href="Lichtjahr" title="Lichtjahr">Lichtjahre</a> von der <a href="Sonne" title="Sonne">Sonne</a> entfernter <a href="Hauptreihe" title="Hauptreihe">Hauptreihenstern</a> der <a href="Spektralklasse" title="Spektralklasse">Spektralklasse</a> A mit einer <a href="Scheinbare_Helligkeit" title="Scheinbare Helligkeit">scheinbaren Helligkeit</a> von 4,4 mag.
</p><p>δ Ursae Minoris trägt den Eigennamen <b>Yildun</b> von türkisch <i>yıldız</i>, „Stern“; aufgrund der <a href="Pr%C3%A4zession" title="Präzession">Präzession</a> der Erde galt Yildun türkischen Astronomen um das Jahr 1500 als der <a href="Polarstern" title="Polarstern">Polarstern</a>. Andere Schreibweisen sind: Gildun, Vildiur, Yilduz. Ein möglicher weiterer Eigenname ist <i>Pherkard</i>.
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