天园十二

**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
SIMBAD	data

天园十二（波江座υ2）是位于波江座的恒星，其视星等为3.804。

参考文献

van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357.
Gutierrez-Moreno, Adelina; 等, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G.
Keenan, P.; McNeil, R., , Astrophysical Journal Supplement Series, October 1989, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
de Bruijne, J. H. J.; Eilers, A.-C., , Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048, doi:10.1051/0004-6361/201219219, A61.
Anderson, E.; Francis, Ch., , Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971, doi:10.1134/S1063773712050015.
Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(65.6\cdot 2.21\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 31.2\cdot R_{\bigodot }\end{aligned}}$
Alves, S.; 等, , 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.
McDonald, I.; 等, , 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.
, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-10-13].

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[vanLeeuwen2007-1] van Leeuwen, F., , Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357.

[Gutierrez-Moreno1966-2] Gutierrez-Moreno, Adelina; 等, 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G.

[Keenan1989-3] Keenan, P.; McNeil, R., , Astrophysical Journal Supplement Series, October 1989, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[deBruijne2012-4] Bruijne, J. H. J.; Eilers, A.-C., , Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048, doi:10.1051/0004-6361/201219219, A61.

[Anderson2012-5] Anderson, E.; Francis, Ch., , Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971, doi:10.1134/S1063773712050015.

[lang2006-6] Lang, Kenneth R., , Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(65.6\cdot 2.21\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 31.2\cdot R_{\bigodot }\end{aligned}}$

[Alves2015-7] Alves, S.; 等, , 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.

[Mcdonald2012-8] McDonald, I.; 等, , 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.

[SIMBAD-9] , SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-10-13].