编辑“︁HD 139777”︁

{{DISPLAYTITLE:小熊座π<sup>1</sup>}}

{{Starbox begin
 | name =小熊座π<sup>1</sup>
}}
{{Starbox observe 2s
 | epoch = [[J2000.0]]
 | equinox = [[J2000.0]] ([[國際天球參考系|ICRS]])
 | constell = [[小熊座]]
 | component1 =小熊座 π<sup>1</sup> A
 | ra1 = {{RA|15|29|11.18599}}<ref name=vanLeeuwen2007/>
 | dec1 = {{DEC|+80|26|54.9713}}<ref name=vanLeeuwen2007/>
 | appmag_v1 = +6.58<ref name=Johnson1953/>
 | component2 =小熊座π<sup>1</sup> B
 | ra2 = {{RA|15|29|23.59426}}<ref name=vanLeeuwen2007/>
 | dec2 = {{DEC|+80|27|00.9675}}<ref name=vanLeeuwen2007/>
 | appmag_v2 = +7.31<ref name=Johnson1953/>
}}
{{Starbox character
 | component1 =小熊座π<sup>1</sup> A
 | class = G1.5&nbsp;V(n)<ref name=Gray2006/> + G9&nbsp;V<ref name=Abt1981/>
 | b-v = +0.67<ref name=Johnson1953/> + +0.79<ref name=Johnson1953/>
 | u-b = +0.13<ref name=Johnson1953/> + +0.37<ref name=Johnson1953/>
 | variable = 
 | component2 = 小熊座π<sup>1</sup> B
 | class2 = G9&nbsp;V<ref name=Abt1981/>
 | b-v2 = +0.79<ref name=Johnson1953/>
 | u-b2 = +0.37<ref name=Johnson1953/>
}}
{{Starbox astrometry
 | component1 = 小熊座π<sup>1</sup> A
 | radial_v = {{Val|−16.27|0.09}}<ref name=deBruijne2012/>
 | prop_mo_ra = −225.109<ref name=dr2a/>
 | prop_mo_dec = +107.575<ref name=dr2a/>
 | parallax = 45.8577
 | p_error = 0.0328
 | parallax_footnote = <ref name=dr2a/>
 | absmag_v = {{Val|4.94|0.04}}<ref name=aaa563_A52/>
 | component2 = π<sup>1</sup> UMi B
 | radial_v2 = {{Val|−15.40|0.70}}<ref name=deBruijne2012/>
 | prop_mo_ra2 = −217.817<ref name=dr2b/>
 | prop_mo_dec2 = +105.947<ref name=dr2b/>
 | parallax2 = 45.8038
 | p_error2 = 0.0352
 | parallax_footnote2 = <ref name=dr2b/>
 | absmag_v2 = 
}}
{{Starbox detail
 | source = 
 | component1 = 小熊座π<sup>1</sup> A
 | mass = 1.02<ref name=Tokovinin2014/>
 | radius = 0.98<ref name=dr2a/>
 | luminosity = 0.929<ref name=dr2a/>
 | temperature = 5,771<ref name=Mishenina2013/>
 | gravity = 4.40<ref name=Mishenina2013/>
 | metal_fe = −0.22<ref name=Casagrande2011/>
 | rotational_velocity = 
 | age_gyr = {{Val|9.22|3.84}}<ref name=Pace2013/>
 | component2 = π<sup>1</sup> UMi B
 | mass2 = 0.92<ref name=Tokovinin2014/>
 | radius2 = 0.84<ref name=dr2b/>
 | luminosity2 = 0.520<ref name=dr2b/>
 | temperature2 = 5,408<ref name=Mishenina2013/>
 | gravity2 = 4.50<ref name=Mishenina2013/>
 | metal2_fe = −0.18<ref name=Casagrande2011/>
}}
{{Starbox catalog
 | names = {{odlist | B=π<sup>1</sup>&nbsp;UMi | ADS=9696 | WDS=J15292+8027 }}<ref name=SIMBAD/>
 | component1 = π<sup>1</sup> UMi A
 | names1     = {{odlist | BD=+80°480 | FK5= | HD=139777 | HIP=75809 | HR=5829 | SAO=2556 }}
 | component2 = π<sup>1</sup> UMi B
 | names2     = {{odlist | BD=+80°481 | FK5= | HD=139813 | HIP=75829 | HR= | SAO=2558 }}
}}
{{Starbox reference
 | Simbad = **+STF+1972AB | sn = π<sup>1</sup> UMi AB
 | Simbad2 = HD+139777 | sn2 = π<sup>1</sup> UMi A
 | Simbad3 = HD+139813 | sn3 = π<sup>1</sup> UMi B
}}
{{Starbox end}}

'''小熊座π<sup>1</sup>'''<ref name=Kepple1998/>是在[[拱極星#星座|拱極星座]][[小熊座]]北部的[[自行|共同自行]][[聯星]]<ref name=Lepine2007/>。該對的[[視星等]]分別為+6.58和+7.31，綜合星等為+6.1<ref name=Johnson1953/>。它們位於距離[[太陽]]約71[[光年]]的地方。兩星的[[角距離]]為31.4[[弧秒]]<ref name=Lepine2007/>，其對應於實際約680[[天文單位|AU]]<ref name=Eisenbeiss2013/>，並以大約13,100年的[[軌道週期|週期]]互繞著彼此運行<ref name=Tokovinin2014/>。

這兩顆恆星都是[[類太陽恆星]]，並已被列為[[恆星運動學#移動星群|天琴-武仙星協]]的可能成員，該星協是距離[[太陽]]最近的[[恆星運動學#移動星群|移動星群]]之一<ref name=Eisenbeiss2013/>，然而現在認為這不太可能<ref name=MG/>。 主星小熊座π<sup>1</sup> A，質量比太陽高2%，表面[[有效溫度]]為{{val|5,771|fmt=commas|ul=K}}，半徑為[[太陽半徑|太陽的]]的98%和[[光度#天文學|輻射熱光度]]為[[太陽]]的93%。伴星，小熊座π<sup>1</sup> B，質量是太陽的92%，溫度略低為{{val|5,408|fmt=commas|u=K}}，半徑是太陽的 84%，光度略高於太陽的一半。

== 參考資料 ==
{{reflist|refs=

<ref name=vanLeeuwen2007>{{citation
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<ref name=Casagrande2011>{{citation
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 | arxiv=1103.4651 | s2cid=56118016 | postscript=. }}</ref>

<ref name=Eisenbeiss2013>{{citation | title=The Hercules-Lyra association revisited. New age estimation and multiplicity study | last1=Eisenbeiss | first1=T. | last2=Ammler-von Eiff | first2=M. | last3=Roell | first3=T. | last4=Mugrauer | first4=M. | last5=Adam | first5=Ch. | last6=Neuhäuser | first6=R. | last7=Schmidt | first7=T. O. B. | last8=Bedalov | first8=A. | journal=Astronomy & Astrophysics | display-authors=1 | volume=556 | id=A53 | pages=19 | date=August 2013 | postscript=. | doi=10.1051/0004-6361/201118362 | bibcode=2013A&A...556A..53E | arxiv=1312.4045 | s2cid=119275785 | url=http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/10866/aa18362-11.pdf?sequence=1 }}{{Dead link|date=November 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

<ref name=deBruijne2012>{{citation
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<ref name=Pace2013>{{citation
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<ref name=aaa563_A52>{{citation
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<ref name=Tokovinin2014>{{citation
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<ref name=Lepine2007>{{citation 
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<ref name=Mishenina2013>{{citation | display-authors=1
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<ref name=Abt1981>{{citation
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<ref name=Gray2006>{{citation | display-authors=1
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 | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
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<ref name=Johnson1953>{{citation
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<ref name=Kepple1998>{{citation
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<ref name=MG>{{citation|doi=10.1086/503183|title=The Nearest Young Moving Groups|journal=The Astrophysical Journal|volume=643|issue=2|pages=1160–1165|year=2006|last1=Lopez-Santiago|first1=J.|last2=Montes|first2=D.|last3=Crespo-Chacon|first3=I.|last4=Fernandez-Figueroa|first4=M. J.|postscript=.|arxiv=astro-ph/0601573|bibcode=2006ApJ...643.1160L |s2cid=119520529}}</ref>

<ref name=SIMBAD>{{cite simbad
 | title=** STF 1972AB | accessdate=2017-06-26 | postscript=. }}
* [https://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+139777 HD 139777 -- High proper-motion Star ] {{Wayback|url=https://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+139777 |date=20240517183244 }}
* [https://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+139813 HD 139813 -- High proper-motion Star ] {{Wayback|url=https://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+139813 |date=20240517183243 }}</ref>

<ref name=dr2a>{{cite DR2|1720995598827435648}}</ref>

<ref name=dr2b>{{cite DR2|1720995598827436928}}</ref>

}}

== 外部連結 ==
* [http://www.glyphweb.com/esky/default.htm?http://www.glyphweb.com/esky/stars/omicronaurigae.html The Electronic Sky] {{Wayback|url=http://www.glyphweb.com/esky/default.htm?http://www.glyphweb.com/esky/stars/omicronaurigae.html |date=20201105143925 }}
* [https://web.archive.org/web/20060417075020/http://www.astro.ufl.edu/~cohen/ast1002/table_19.html University of Florida Astronomy Department]
* [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%201971 HR 1971] {{Wayback|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%201971 |date=20201003025405 }}
* [http://aladin.u-strasbg.fr/AladinPreview?-c=05+45+54.0387%2B49+49+34.519&ident=*+omi+Aur&submit=Aladin+previewer Image Omicron Aurigae]

{{Stars of Ursa Minor|state=collapsed}}

{{DEFAULTSORT:Pi1 Ursae Minoris}}
[[Category:G型主序星]]
[[Category:聯星]]
[[Category:拜耳天體|小熊座, π]]
[[Category:小熊座]]
[[Category:BD、CD和CP天體]]
[[Category:HD和HDE天體|139777 139813]]
[[Category:HIP天體|75809 75829]]
[[Category:HR天體|5829]]