鯨魚座κ2
  | |
| 观测资料 历元 J2000.0 | |
|---|---|
| 星座 | 鲸鱼座 |
| 星官 | |
| 赤经 | 03h 21m 06.80281s[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 (Rv) | +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 (MV) | 0.630[5] |
| 详细资料 [4] | |
| 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 | |
| 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。
术语
[编辑]鲸鱼座κ2 曾经被称为金牛座g2[8]。
特点
[编辑]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
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ^ 2.0 2.1 2.2 2.3 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.
- ^ 3.0 3.1 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.
- ^ 4.0 4.1 4.2 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.
- ^ 5.0 5.1 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.
- ^ [ kap02 Cet] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. - ^ 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.
- ^ Ridpath, Ian, Bayer's Uranometria and Bayer letters, Star Tales.
外部链接
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