鯨魚座κ2

**鲸鱼座κ² Ceti**
	{{{caption}}}
观测资料; 历元 J2000.0
星座	鲸鱼座
星官
赤经	03h 21m 06.80281s
赤纬	+03° 40′ 32.2344″
视星等（V）	5.66
特性
光谱分类	G8 III
U−B 色指数	+0.73
B−V 色指数	+0.97
天体测定
径向速度 (Rv)	+7.44±0.10 km/s
自行 (μ)	赤经：+55.04 mas/yr ; 赤纬：−25.12 mas/yr
视差 (π)	10.11 ± 0.33 mas
距离	320 ± 10 ly ; (99 ± 3 pc)
绝对星等 (MV)	0.630
详细资料
质量	2.46±0.09 M☉
半径	8.23±0.57 R☉
表面重力 (log g)	2.98±0.04
亮度	41.7 L☉
温度	5,007±22 K
金属量 [Fe/H]	+0.11±0.03 dex
自转速度 (v sin i)	0.98±0.45 km/s
年龄	610±60 Myr
其他命名
	鲸鱼座κ2、[[金牛座g2]]、鲸鱼座97、 BD+03° 461、HD 20791、HIP 15619、HR 1007、SAO 111142
参考数据库
SIMBAD	资料

鲸鱼座κ² （κ² Ceti）是位于天球赤道星座鲸鱼座的一颗孤独的^[7]黄巨星。它的视星等为5.66，虽然微弱但在足够黑暗的场所仍可用裸眼看见^[2]。基于从地球上观测的恒星视差为10.11mas的^[1]，它距离太阳约为320 光年。

Quick Facts 观测资料历元 J2000.0, 特性 ...

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术语

鲸鱼座κ² 曾经被称为金牛座g²^[8]。

特点

这是一颗演化中的G型巨星，恒星分类为G8III^[3]。它是水平分支上的红群聚恒星，这表明它正在其核心通过氦融合产生能量^[5]。这颗恒星的质量是太阳的2.46倍，并且已经膨胀到太阳半径的8.2倍。在5,007k的有效温度下，它从光球发出的辐射是太阳光度的42倍^[4]。

参考资料

[1]
van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.
[2]
Lucke, P. B., The OB stellar associations in the Large Magellanic Cloud, Astrophysical Journal Supplement Series, November 1974, 28: 73, Bibcode:1974ApJS...28...73L, doi:10.1086/190311.
[3]
Houk, N.; Swift, C., Michigan catalogue of two-dimensional spectral types for the HD Stars, Michigan Spectral Survey (Ann Arbor, Michigan: Department of Astronomy, University of Michigan), 1999, 5, Bibcode:1999MSS...C05....0H.
[4]
Jofré, E.; et al, Stellar parameters and chemical abundances of 223 evolved stars with and without planets, Astronomy & Astrophysics, 2015, 574: A50, Bibcode:2015A&A...574A..50J, S2CID 53666931, arXiv:1410.6422 , doi:10.1051/0004-6361/201424474.
[5]
Mishenina, T. V.; et al, Elemental abundances in the atmosphere of clump giants, Astronomy and Astrophysics, September 2006, 456 (3): 1109–1120, Bibcode:2006A&A...456.1109M, S2CID 18764566, arXiv:astro-ph/0605615 , doi:10.1051/0004-6361:20065141.
[6]
kap02 Cet. SIMBAD. 斯特拉斯堡天文资料中心.
[7]
Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.
[8]
Ridpath, Ian, Bayer's Uranometria and Bayer letters, Star Tales.

外部链接

http://server7.wikisky.org/starview?object_type=1&object_id=3734

[vanLeeuwen2007-1] [1]
van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.

[Lucke1974-2] [2]
Lucke, P. B., The OB stellar associations in the Large Magellanic Cloud, Astrophysical Journal Supplement Series, November 1974, 28: 73, Bibcode:1974ApJS...28...73L, doi:10.1086/190311.

[Houk1999-3] [3]
Houk, N.; Swift, C., Michigan catalogue of two-dimensional spectral types for the HD Stars, Michigan Spectral Survey (Ann Arbor, Michigan: Department of Astronomy, University of Michigan), 1999, 5, Bibcode:1999MSS...C05....0H.

[Jofre2015-4] [4]
Jofré, E.; et al, Stellar parameters and chemical abundances of 223 evolved stars with and without planets, Astronomy & Astrophysics, 2015, 574: A50, Bibcode:2015A&A...574A..50J, S2CID 53666931, arXiv:1410.6422 , doi:10.1051/0004-6361/201424474.

[Mishenina2006-5] [5]
Mishenina, T. V.; et al, Elemental abundances in the atmosphere of clump giants, Astronomy and Astrophysics, September 2006, 456 (3): 1109–1120, Bibcode:2006A&A...456.1109M, S2CID 18764566, arXiv:astro-ph/0605615 , doi:10.1051/0004-6361:20065141.

[SIMBAD-6] [6]
kap02 Cet. SIMBAD. 斯特拉斯堡天文资料中心.

[Eggleton2008-7] [7]
Eggleton, P. P.; Tokovinin, A. A., A catalogue of multiplicity among bright stellar systems, Monthly Notices of the Royal Astronomical Society, September 2008, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, S2CID 14878976, arXiv:0806.2878 , doi:10.1111/j.1365-2966.2008.13596.x.

[8] [8]
Ridpath, Ian, Bayer's Uranometria and Bayer letters, Star Tales.

[7]

[2]

[1]

[3]

[4]

[5]

[6]

[8]

观测资料历元 J2000.0
{{{caption}}}
星座	鲸鱼座
星官
赤经	03^h 21^m 06.80281^s^[1]
赤纬	+03° 40′ 32.2344″^[1]
视星等（V）	5.66^[2]
特性
光谱分类	G8 III^[3]
U−B 色指数	+0.73^[2]
B−V 色指数	+0.97^[2]
天体测定

径向速度 (R_v)	7000744000000000000♠+7.44±0.10^[4] km/s
自行 (μ)	赤经：+55.04^[1] mas/yr 赤纬：−25.12^[1] mas/yr
视差 (π)	10.11 ± 0.33^[1] mas
距离	320 ± 10 ly (99 ± 3 pc)
绝对星等 (M_V)	0.630^[5]

详细资料 ^{^[4]}

质量	7000246000000000000♠2.46±0.09 M_☉
半径	7000823000000000000♠8.23±0.57 R_☉
表面重力 (log g)	7000298000000000000♠2.98±0.04
亮度	41.7 L_☉
温度	7003500700000000000♠5,007±22 K
金属量 [Fe/H]	6999110000000000000♠+0.11±0.03 dex
自转速度 (v sin i)	6999980000000000000♠0.98±0.45 km/s
年龄	7002610000000000000♠610±60 Myr

其他命名
鲸鱼座κ²、[[金牛座g²]]、鲸鱼座97、 BD+03° 461、HD 20791、HIP 15619、HR 1007、SAO 111142^[6]
参考数据库
SIMBAD	资料