天園十二

**天園十二**
觀測資料; 曆元 J2000.0
星座	波江座
星官
赤經	04h 35m 33.03834s
赤緯	−30° 33′ 44.4297″
視星等（V）	3.804
特性
光譜分類	G8+ III
U−B 色指數	+0.740
B−V 色指數	+0.968
天體測定
徑向速度 (Rv)	−4.0±0.9 km/s
自行 (μ)	赤經：−49.27 mas/yr ; 赤緯：−12.72 mas/yr
視差 (π)	15.25 ± 0.19 mas
距離	214 ± 3 ly ; (65.6 ± 0.8 pc)
絕對星等 (MV)	−0.27
詳細資料
半徑	16 R☉
表面重力 (log g)	2.77±0.07
亮度	138 L☉
溫度	5,074±30 K
金屬量 [Fe/H]	0.04±0.03 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.
參考資料庫
SIMBAD	資料

天園十二（波江座υ2）是位於波江座的恆星，其視星等為3.804。

參考文獻

^ ^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.
^ ^2.0 ^2.1 ^2.2 Gutierrez-Moreno, Adelina; et al, A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G.
^ 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.
^ 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.
^ 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.
^ Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2018-02-25], ISBN 3-540-29692-1, （原始內容存檔於2019-05-20）. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(65.6\cdot 2.21\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 31.2\cdot R_{\bigodot }\end{aligned}}$
^ ^7.0 ^7.1 ^7.2 Alves, S.; et al, 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.
^ McDonald, I.; et al, 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.
^ ups02 Eri -- Star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-10-13], （原始內容存檔於2020-11-05）.

[vanLeeuwen2007-1] 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.

[Gutierrez-Moreno1966-2] 2.0 ^2.1 ^2.2 Gutierrez-Moreno, Adelina; et al, A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy: 1–17, 1966, Bibcode:1966PDAUC...1....1G.

[Keenan1989-3] 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.

[deBruijne2012-4] 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.

[Anderson2012-5] 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.

[lang2006-6] Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3rd, Birkhäuser, 2006 [2018-02-25], ISBN 3-540-29692-1, （原始內容存檔於2019-05-20）. 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] 7.0 ^7.1 ^7.2 Alves, S.; et al, 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.

[Mcdonald2012-8] McDonald, I.; et al, 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.

[SIMBAD-9] ups02 Eri -- Star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-10-13], （原始內容存檔於2020-11-05）.

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觀測資料曆元 J2000.0
星座	波江座
星官
赤經	04^h 35^m 33.03834^s^[1]
赤緯	−30° 33′ 44.4297″^[1]
視星等（V）	3.804^[2]
特性
光譜分類	G8+ III^[3]
U−B 色指數	+0.740^[2]
B−V 色指數	+0.968^[2]
天體測定

徑向速度 (R_v)	2999600000000000000♠−4.0±0.9^[4] km/s
自行 (μ)	赤經：−49.27^[1] mas/yr 赤緯：−12.72^[1] mas/yr
視差 (π)	15.25 ± 0.19^[1] mas
距離	214 ± 3 ly (65.6 ± 0.8 pc)
絕對星等 (M_V)	−0.27^[5]

詳細資料

半徑	16^[6] R_☉
表面重力 (log g)	7000277000000000000♠2.77±0.07^[7]
亮度	138^[8] L_☉
溫度	7003507400000000000♠5,074±30^[7] K
金屬量 [Fe/H]	6998400000000000000♠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	資料