HD 219828

HD 219828
星座 ペガスス座
見かけの等級 (mv) 8.01
位置
元期:J2000.0
赤経 (RA, α)  23h 18m 46.73445s[1]
赤緯 (Dec, δ) +18° 38′ 44.6021″[1]
視線速度 (Rv) -24.13 km/s[1]
固有運動 (μ) 赤経: -4.15 ミリ秒/年[1]
赤緯: 4.14 ミリ秒/年[1]
年周視差 (π) 13.83 ± 0.74 ミリ秒[1]
距離 236 光年
（72.3 パーセク）
絶対等級 (MV) 3.7
物理的性質
半径 1.7 R☉[2]
質量 1.23 M☉[3]
表面重力 12 G[2]
自転速度 2.9 km/s[3]
スペクトル分類 G0 IV
光度 3.08 L☉[3]
表面温度 5,891 K[2]
金属量[Fe/H] 0.19（太陽比）[2]
年齢 5.2 ×109 年[4]
他のカタログでの名称
BD+17 4896, GSC 01716-01182, HIP 115100, SAO 108536
■Template （■ノート ■解説） ■Project

HD 219828は、ペガスス座の方角約256光年離れた位置にある、8等級の恒星である。黄色準巨星で、核での水素核融合は終わっているとみられる。

大きさの比較
太陽 HD 219828
太陽 Exoplanet


惑星系

2007年に、ラ・シヤ天文台の3.6m望遠鏡を用いた視線速度法による観測で、海王星程度の大きさの太陽系外惑星HD 219828 bが発見された[2]。

2016年には、オート＝プロヴァンス天文台の観測結果も加えて更に詳細な視線速度の分析を行った結果、惑星bの外側に木星の15倍以上の質量を持つ別の惑星HD 219828 cが発見された[3]。この惑星cの公転軌道は、離心率が約0.8と非常に細長い楕円で、惑星bの公転軌道とは大きく違っており、既知の系外惑星系の中ではとても珍しい存在である。

HD 219828の惑星[3]
名称
（恒星に近い順） 		質量 軌道長半径
（天文単位） 		公転周期
(日) 		軌道離心率 軌道傾斜角 半径
b > 21.0 M⊕ 0.045 3.834887 ± 0.000096 0059 ± 0.036 — —
c > 15.1 MJ 5.96 4,791 ± 75 0.8115 ± 0.0032 — —

出典

  1. ^ a b c d e f “HD 219828 -- Star”. SIMBAD. CDS. 2017年6月3日閲覧。
  2. ^ a b c d e Melo, C.; et al. (2007-05). “A new Neptune-mass planet orbiting HD 219828”. Astronomy and Astrophysics 467: 721-727. Bibcode: 2007A&A...467..721M. doi:10.1051/0004-6361:20066845. 
  3. ^ a b c d e Santos, N. C.; et al. (2016-07), “An extreme planetary system around HD 219828. One long-period super Jupiter to a hot-Neptune host star”, Astronomy and Astrophysics 592: A13, Bibcode: 2016A&A...592A..13S, doi:10.1051/0004-6361/201628374 
  4. ^ Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016-01), “Age consistency between exoplanet hosts and field stars”, Astronomy and Astrophysics 585: A5, Bibcode: 2016A&A...585A...5B, doi:10.1051/0004-6361/201527297 

外部リンク

座標: 星図 23h 18m 46.73445s, +18° 38′ 44.6021″

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