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HD 20868 b

HD 20868 b
太陽系外行星 太陽系外行星列表
母恆星
母恆星 HD 20868
星座 天爐座
赤经 (α) 03h 20m 42.6943s
赤纬 (δ) –33° 43′ 48.374″
距離159.5 ± 11.4 ly (48.9 ± 3.5 pc)
光譜類型 K3/4IV
軌道參數
半長軸 (a) 0.947 ± 0.012 AU
軌道離心率 (e) 0.75 ± 0.002
公轉週期 (P) 380.85 ± 0.09 d (1.0427 ± 0.0002 y)
近星點時間 (T0) 2,454,451.52 ± 0.1 JD
物理性质
最小质量(m sin i)1.99 ± 0.05 MJ
(632 ± 16 M🜨)
發現
發現時間 2008年10月26日
發現者 Moutou 等人
發現方法 都卜勒光譜學
HARPS
發現地點 拉西拉天文台
發表論文 已發表論文
數據庫參考
太陽系外行星
百科全書
data
SIMBADdata

HD 20868 b是一顆位於天爐座太陽系外行星,距離地球約159光年,母恆星是視星等10等的K型次巨星HD 20868。該行星的質量下限是木星的1.99倍,與母恆星平均距離0.947天文單位,軌道週期380.85日或12.5個月,軌道離心率0.75,是已知軌道離心率最高的系外行星之一。它和母恆星距離最近是0.237天文單位,最遠則是1.66天文單位。

該恆星於2008年10月26日由 Moutou 等人以智利拉西拉天文台ESO 3.6米望遠鏡高精度徑向速度行星搜索器發現。

參見

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參考資料

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外部連結

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HD 20868 b
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