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开普勒12

开普勒12
观测资料
历元 J2000
星座 天龙座
星官
赤经 19h 04m 58.4221s[1]
赤纬 +50° 02′ 25.271″[1]
视星等(V) 13.4[2]
天体测定
自行 (μ) 赤经:3.053±0.025[1] mas/yr
赤纬:3.235±0.024[1] mas/yr
视差 (π)1.1057 ± 0.0125[1] mas
距离2,950 ± 30 ly
(900 ± 10 pc)
特性
光谱分类G0[2]
详细资料 [2]
质量1.166±0.054 M
半径1.483±0.029 R
温度5947±100 K
金属量 [Fe/H]0.07 (± 0.04) dex
自转速度 (v sin i)2.7±0.5[3] km/s
年龄4.0±0.4 Gyr
其他命名
KOI-20、​KIC 11804465、​GSC 03549-00844、​2MASS J19045842+5002253[3]
参考数据库
SIMBAD资料
KIC资料

开普勒12(英语:Kepler-12),别名KOI-20KIC 11804465等,是一颗位于天龙座恒星,它拥有一颗凌日行星,即开普勒12b。

特征

[编辑]

开普勒12,在开普勒输入星表中也称为KIC 11804465,是一颗早期G型到晚期F型恒星。这与接近主序星末端的一颗类日矮恒星强烈对应,并且即将变成红巨星[4]开普勒12距地球约900秒差距(2,950光年)。这颗恒星的视星等为13.438,这意味着人们无法用肉眼从地球上看到它。[2]

这颗恒星比太阳质量稍大,铁含量稍多,温度也稍高。然而,开普勒12更大,半径是太阳半径的1.483倍。[2]

行星系

[编辑]

目前已知的一颗行星是一颗热木星,其半径是木星的1.7倍,但质量不到木星的一半。[5]

开普勒12的行星系[5][4]
成员
(依恒星距离)
质量 半长轴
(AU)
轨道周期
()
离心率 倾角 半径
b 0.432+0.053
−0.051
 MJ
0.0553+0.0010
−0.0012
4.4379637±0.0000002 0 88.796+0.088
−0.074
°
1.754+0.031
−0.036
 RJ

参考资料

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365可免费查阅. doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录
  2. ^ 2.0 2.1 2.2 2.3 2.4 Notes on Kepler-12 b. [29 December 2016]. (原始内容存档于2017-12-06). 
  3. ^ 3.0 3.1 [ Kepler-12] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. 
  4. ^ 4.0 4.1 Fortney, Jonathan J.; et al. Discovery and Atmospheric Characterization of Giant Planet Kepler-12b: An Inflated Radius Outlier. The Astrophysical Journal Supplement Series. 2011, 197 (1). 9. Bibcode:2011ApJS..197....9F可免费查阅. arXiv:1109.1611可免费查阅. doi:10.1088/0067-0049/197/1/9可免费查阅. 
  5. ^ 5.0 5.1 Esteves, Lisa J.; Mooij, Ernst J. W. De; Jayawardhana, Ray. Changing Phases of Alien Worlds: Probing Atmospheres Of Kepler planets with High-Precision Photometry. The Astrophysical Journal. 2015, 804 (2). 150. Bibcode:2015ApJ...804..150E可免费查阅. arXiv:1407.2245可免费查阅. doi:10.1088/0004-637X/804/2/150可免费查阅. 


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开普勒12
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