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小熊座π1

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小熊座π1
觀測數據
曆元 J2000.0      分點 J2000.0 (ICRS)
星座 小熊座
小熊座 π1 A
赤經 15h 29m 11.18599s[1]
赤緯 +80° 26′ 54.9713″[1]
視星等 (V) +6.58[2]
小熊座π1 B
赤經 15h 29m 23.59426s[1]
赤緯 +80° 27′ 00.9675″[1]
視星等 (V) +7.31[2]
特性
光譜分類G1.5 V(n)[3] + G9 V[4]
U−B 色指數+0.13[2] + +0.37[2]
B−V 色指數+0.67[2] + +0.79[2]
天體測定
小熊座π1 A
徑向速度 (Rv)−16.27±0.09[5] km/s
自行 (μ) 赤經：−225.109[6] mas/yr
赤緯：+107.575[6] mas/yr
視差 (π)45.8577 ± 0.0328[6] mas
距離71.12 ± 0.05 ly
(21.81 ± 0.02 pc)
絕對星等 (MV)4.94±0.04[7]
π1 UMi B
徑向速度 (Rv)−15.40±0.70[5] km/s
自行 (μ) 赤經：−217.817[8] mas/yr
赤緯：+105.947[8] mas/yr
視差 (π)45.8038 ± 0.0352[8] mas
距離71.21 ± 0.05 ly
(21.83 ± 0.02 pc)
詳細資料
小熊座π1 A
質量1.02[9] M☉
半徑0.98[6] R☉
表面重力 (log g)4.40[10]
亮度0.929[6] L☉
溫度5,771[10] K
金屬量 [Fe/H]−0.22[11] dex
年齡9.22±3.84[12] Gyr
π1 UMi B
質量0.92[9] M☉
半徑0.84[8] R☉
表面重力 (log g)4.50[10]
亮度0.520[8] L☉
溫度5,408[10] K
其他命名
π1 UMi、​ADS 9696、​WDS J15292+8027[13]
參考資料庫
SIMBADπ1 UMi AB
π1 UMi A
π1 UMi B

小熊座π1[14]是在拱極星座小熊座北部的共同自行聯星[15]。該對的視星等分別為+6.58和+7.31，綜合星等為+6.1[2]。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[15]，其對應於實際約680AU[16]，並以大約13,100年的週期互繞着彼此運行[9]。

這兩顆恆星都是類太陽恆星，並已被列為天琴-武仙星協的可能成員，該星協是距離太陽最近的移動星群之一[16]，然而現在認為這不太可能[17]。 主星小熊座π1 A，質量比太陽高2%，表面有效溫度為5,771 K，半徑為太陽的的98%和輻射熱光度為太陽的93%。伴星，小熊座π1 B，質量是太陽的92%，溫度略低為5,408 K，半徑是太陽的 84%，光度略高於太陽的一半。

參考資料

[編輯]
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  8. ^ 8.0 8.1 8.2 8.3 8.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 可免費查閱. doi:10.1051/0004-6361/201833051.  VizieR中此天體在蓋亞望遠鏡第二批數據發佈的記錄
  9. ^ 9.0 9.1 9.2 Tokovinin, Andrei, From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs, The Astronomical Journal, 2014, 147 (4): 14, Bibcode:2014AJ....147...87T, S2CID 56066740, arXiv:1401.6827 可免費查閱, doi:10.1088/0004-6256/147/4/87, 87. 
  10. ^ 10.0 10.1 10.2 10.3 Mishenina, T. V.; et al, Abundances of neutron-capture elements in stars of the Galactic disk substructures, Astronomy & Astrophysics, April 2013, 552: 12, Bibcode:2013A&A...552A.128M, S2CID 119268097, arXiv:1303.1730 可免費查閱, doi:10.1051/0004-6361/201220687, A128. 
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外部連結

[編輯]
取自 "https://zh.wikipedia.org/w/index.php?title=HD_139777&oldid=83166572"