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南河增八

南河增八
HD 66141
50 G. Canis Minoris
觀測資料
曆元 J2000.0
星座 小犬座[1][2]
星官 朱雀 井宿 南河
赤經 8h 2m 15.9s[1][2]
赤緯 +2° 20′ 4″[1][2]
視星等(V) 4.39[1][2][3]
特性
光谱分类K2III[1][2]
U−B 色指数1.28[1][2]
B−V 色指数1.25[1][2]
R−I 色指数0.67[1][2]
天体测定
视差 (π)12.84 mas ± 0.25 mas mas
距离254 ± 6.5 ly
(77.9 ± 2 pc)
詳細資料
質量1.1 ± 0.1[3] M
半徑21.4 ± 0.6[3] R
表面重力 (log g)1.3 ± 0.5[4]
亮度174 L
溫度4305 ± 15[4] K
金屬量-0.32 ± 0.034[3]
自轉1.5[4]
年齡6.84 ± 1.39 × 109[3]
其他命名
BD+02 1854,SAO 116260,HD 66141,HR 3145,FK5 2623,HIP 39311,GC 10891,CCDM 08022+0221
參考資料庫
SIMBAD资料

南河增八,即HD 66141,又名BD+02°1854SAO 116260HR 314550 G. Canis Minoris,是一颗小犬座的恒星[1][2],视星等为4.39,位于銀經219.07,銀緯16.8,其B1900.0坐标为赤經7h 57m 3.7s,赤緯+2° 16.8′ 34″。是橙色的K型,距離地球約254光年。

當該恆星首次被列入星表時是列入船尾座,在佛蘭斯蒂德命名法中稱為「船尾座13」(13 Puppis),但之後被劃入小犬座[5]约翰·波得拜耳命名法給予該恆星編號小犬座λ[6]

2003到2012年間有一個星斑讓南河增八的光度週期性下降[4]

行星系統

[编辑]

自2003年12月到2012年1月,一組韓國天文學家使用普賢山天文台日语普賢山光学天文台以光纖傳輸資料的普賢山天文台階梯光柵攝譜儀(Bohyunsan Observatory Echelle Spectrograph,BOES)對南河增八進行高解析度的光譜觀測[4]

2012年該團隊宣布以徑向速度法在南河增八旁發現一顆長週期的太陽系外行星,並且相關論文發表於同年11月。

南河增八的行星系[3]
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 >6 ± 0.3 MJ MJ 1.2 ± 0.1 480.5 ± 0.5 0.07 ± 0.03

參考資料

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. (原始内容存档于2019-08-09). 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 VizieR Detailed Page. [2012-07-13]. (原始内容存档于2016-03-05). 
  3. ^ 3.0 3.1 3.2 3.3 3.4 3.5 hd_66141_b. [2012-12-29]. (原始内容存档于2020-07-27). 
  4. ^ 4.0 4.1 4.2 4.3 4.4 Lee, B.-C.; Mkrtichian, D. E.; Han, I.; Park, M.-G.; Kim, K.-M. Detection of an exoplanet around the evolved K giant HD 66141. Astronomy & Astrophysics. 2012-12-01, 548 [2022-07-11]. ISSN 0004-6361. arXiv:1211.2054可免费查阅. doi:10.1051/0004-6361/201118014. (原始内容存档于2022-06-30) (英语). 
  5. ^ Griffin, R. F. Spectroscopic binary orbits from photoelectric radial velocities. Paper 148: HR 7955. The Observatory. 1999, 119: 272–283. Bibcode:1999Obs...119..272G. 
  6. ^ Wagman, Morton. Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. 2003: 460. ISBN 978-0-939923-78-6. 
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南河增八
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