开普勒18
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 天鹅座 |
| 星官 | |
| 赤经 | 19h 52m 19.0688s[1] |
| 赤纬 | +44° 44′ 46.808″[1] |
| 视星等（V） | 14.0 |
| 特性 | |
| 光谱分类 | G7 |
| 天体测定 | |
| 自行 (μ) | 赤经：−1.432±0.031[1] mas/yr 赤纬：−20.313±0.028[1] mas/yr |
| 视差 (π) | 2.2804 ± 0.0168[1] mas |
| 距离 | 1,430 ± 10 ly (439 ± 3 pc) |
| 详细资料 [2] | |
| 质量 | 0.972 ± 0.042 M☉ |
| 半径 | 1.108 ± 0.051 R☉ |
| 表面重力 (log g) | 4.32 ± 0.12 |
| 亮度 | 0.93 L☉ |
| 温度 | 5383 ± 44 K |
| 金属量 [Fe/H] | 0.19 ± 0.06 dex |
| 自转速度 (v sin i) | <4 km/s |
| 年龄 | 10.0 ± 2.3 Gyr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
| 系外行星百科 | 资料 |
开普勒18（英语：Kepler-18）是天鹅座中一颗质量与太阳几乎相同的恒星。
行星系统
[编辑]这颗恒星周围有3颗已确认的行星，它们的存在于2011年宣布。[2]在2021年，人们发现开普勒18d的轨道平面正在缓慢变化，可能是受到另外一颗巨行星的引力影响。[4]
| 成员 (依恒星距离) |
质量 | 半长轴 (AU) |
轨道周期 (天) |
离心率 | 倾角 | 半径 |
|---|---|---|---|---|---|---|
| b | 6.9 ± 3.4 M⊕ | 0.0447 ± 0.0006 | 3.504725 ± 0.000028 | — | 84.92 ± 0.26° | 2.00 ± 0.10 R⊕ |
| c | 17.3 ± 1.9 M⊕ | 0.0752 ± 0.0011 | 7.6415716 | — | 87.68 ± 0.22° | 5.49 ± 0.26 R⊕ |
| d | 16.4 ± 1.4 M⊕ | 0.1172 ± 0.0017 | 14.858941 | — | 88.07 ± 0.1° | 6.98 ± 0.33 R⊕ |
参考资料
[编辑]- ^ 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
. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 catalog entry
- ^ 2.0 2.1 2.2 Cochran, William D.; et al. Kepler 18-b, c, and d: A System Of Three Planets Confirmed by Transit Timing Variations, Lightcurve Validation, Spitzer Photometry and Radial Velocity Measurements. The Astrophysical Journal Supplement Series. 2011, 197 (1): 7. Bibcode:2011ApJS..197....7C. S2CID 16505452. arXiv:1110.0820 . doi:10.1088/0067-0049/197/1/7.
- ^ [ Kepler-18] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. - ^ Shahaf, Sahar; Mazeh, Tsevi; Zucker, Shay; Fabrycky, Daniel, Systematic search for long-term transit duration changes in Kepler transiting planets, Monthly Notices of the Royal Astronomical Society, 2021, 505: 1293–1310, arXiv:2105.04318 , doi:10.1093/mnras/stab1359
- ^ Montet, Benjamin T.; Johnson, John Asher, Model-Independent Stellar and Planetary Masses from Multi-Transiting Exoplanetary Systems, The Astrophysical Journal, 2013, 762 (2): 112, S2CID 29261765, arXiv:1211.4028v1 , doi:10.1088/0004-637X/762/2/112
外部链接
[编辑]
| |||||||||||||||||||||||||||||||||||||||||||||||||||
.jpg)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
Cover photo is available under {{::mainImage.info.license.name || 'Unknown'}} license.
Cover photo is available under {{::mainImage.info.license.name || 'Unknown'}} license.
Credit:
(see original file).
