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HD 219828

HD 219828
觀測資料
曆元 2000
星座 飛馬座
星官 (({星官))}
赤經 23h 18m 46.7353s
赤緯 +18° 38′ 44.590″
視星等(V) +8.04
距離 264.5 光年
(81.1 pc)
光譜分類 G0IV
其他命名

HD 219828是一個位於飛馬座的視星等8等恆星,距離地球約265光年。該恆星是黃次巨星,代表核心內的核融合已經停止。

行星系統

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2007年 Claudio Melo 在該恆星旁發現一顆質量相當於海王星系外行星。根據相關論文作者所述,該行星可能是類似地球的岩石行星[1],半徑大約是地球的2.2倍。如果能進一步觀測到凌星現象,就可進一步證明,雖然目前仍是相當困難[2]。此外,軌道的最佳擬合解暗示有另一個質量相當於木星70%的行星存在,距離母恆星約0.68天文單位,並且是軌道離心率0.3的橢圓軌道。

HD 219828的行星系
成員
(依恆星距離)
质量 半長軸
(AU)
轨道周期
()
離心率 傾角 半径
b >0.066 MJ 0.052 3.8335 ± 0.0013 0
c (未确认) ≥0.7 MJ ≈0.68 ≥181 ≥0.3

參見

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參考資料

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  1. ^ Valencia; Oconnell, R; Sasselov, D; et al. Internal structure of massive terrestrial planets. Icarus. 2006, 181 (2): 545–554. Bibcode:2006Icar..181..545V. arXiv:astro-ph/0511150可免费查阅. doi:10.1016/j.icarus.2005.11.021. 
  2. ^ Melo; Santos, N. C.; Gieren, W.; Pietrzynski, G.; Ruiz, M. T.; Sousa, S. G.; Bouchy, F.; Lovis, C.; Mayor, M.; et al. A new Neptune-mass planet orbiting HD 219828. Astronomy and Astrophysics. 2007, 467 (2): 721–727. Bibcode:2007A&A...467..721M. arXiv:astro-ph/0702459可免费查阅. doi:10.1051/0004-6361:20066845. 

外部連結

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  • HD 219828. The Extrasolar Planets Encyclopaedia. [2012-05-24]. (原始内容存档于2012-02-06). 
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HD 219828
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