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天园十二(波江座υ2)是位于波江座的恒星,其视星等为3.804。

天园十二
觀測資料
曆元 J2000.0
星座 波江座
星官
赤經 04h 35m 33.03834s[1]
赤緯 −30° 33′ 44.4297″[1]
視星等(V) 3.804[2]
特性
光谱分类G8+ III[3]
U−B 色指数+0.740[2]
B−V 色指数+0.968[2]
天体测定
徑向速度 (Rv)−4.0±0.9[4] km/s
自行 (μ) 赤经:−49.27[1] mas/yr
赤纬:−12.72[1] mas/yr
视差 (π)15.25 ± 0.19[1] mas
距离214 ± 3 ly
(65.6 ± 0.8 pc)
绝对星等 (MV)−0.27[5]
詳細資料
半徑16[6] R
表面重力 (log g)2.77±0.07[7]
亮度138[8] L
溫度5,074±30[7] K
金属量 [Fe/H]0.04±0.03[7] dex
其他命名
Theemin, υ² Eridani, Upsilon² Eridani, 52 Eridani, CD −30° 1901, CPD−30 631, FK5 170, GC 5614, HD 29291, HIP 21393, HR 1464, PPM 280424, SAO 195148.[9]
參考資料庫
SIMBADdata


参考文献编辑

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 Gutierrez-Moreno, Adelina; 等, A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G. 
  3. ^ Keenan, P.; McNeil, R., The Perkins catalog of revised MK types for the cooler stars, Astrophysical Journal Supplement Series, October 1989, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373. 
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971, doi:10.1134/S1063773712050015. 
  6. ^ Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006, ISBN 3-540-29692-1.  The radius (R*) is given by:
     
  7. ^ 7.0 7.1 7.2 Alves, S.; 等, Determination of the spectroscopic stellar parameters for 257 field giant stars, Monthly Notices of the Royal Astronomical Society, April 2015, 448 (3): 2749–2765, Bibcode:2015MNRAS.448.2749A, arXiv:1503.02556, doi:10.1093/mnras/stv189. 
  8. ^ McDonald, I.; 等, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037, doi:10.1111/j.1365-2966.2012.21873.x. 
  9. ^ ups02 Eri -- Star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-10-13].