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HD 47366

HD 47366
观测资料
历元 J2000.0
星座 大犬座
星官
赤经 06h 37m 40.79354s[1]
赤纬 −12° 59′ 06.4138″[1]
视星等(V) 6.12[2]
特性
光谱分类K1III:[3]
B−V 色指数0.977[3]
天体测定
径向速度 (Rv)9.01[3] km/s
自行 (μ) 赤经:+10.32[1] mas/yr
赤纬:−124.46[1] mas/yr
视差 (π)12.50 ± 0.42[1] mas
距离261 ± 9 ly
(80 ± 3 pc)
绝对星等 (MV)1.459[3]
详细资料
质量1.81±0.13[4] M
半径7.30±0.33[4] R
表面重力 (log g)2.60[3]
亮度26.1±1.8[4] L
温度4,772[3] K
金属量 [Fe/H]−0.16[3] dex
自转< 86[4] d
自转速度 (v sin i)4.3±0.8[4] km/s
年龄1.61±0.53[4] Gyr
其他命名
BD−12° 1566, HD 47366, HIP 31674, HR 2437, SAO 151725.[5]

HD 47366是一颗在天球上位于大犬座的恒星,视星等6.12[2],接近人类肉眼可见恒星最低亮度极限。根据波特尔暗空分类法,必须在无光害的乡村夜空才能以肉眼看到它。依巴谷卫星恒星视差量测其距离约为261光年(80秒差距[1]

概要

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HD 47366是一颗光谱型 K1III 的巨星[3]。根据光谱资料观测,其质量大约是1.81倍太阳质量,年龄大约是16亿年,因此可推测它的演化阶段已经离开了主序星时期。HD 47366的半径大约是7.3倍太阳半径,光度是太阳的26倍,表面有效温度4722 K。它的投影自转速度4.3 km/s,代表它的自转周期在86日以下[4]

行星系统

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2016年时,一组天文学家报告在HD 47366旁发现两颗巨行星。对HD 47366的径向速度量测显示恒星旁的行星重力使恒星的运动受到扰动。初步的最佳资料拟合结果显示有两个周期存在:一颗轨道周期约1年和另一颗轨道周期约2年的行星。这两颗行星的预测质量都高于木星,其质量下限分别为木星的1.8和1.9倍。但直到得知这两颗行星的轨道倾角以前人无法得知其实际质量[4]

HD 47366的行星系[4]
成员
(依恒星距离)
质量 半长轴
(AU)
轨道周期
()
离心率 倾角 半径
b ≥ 1.75+0.20
−0.17
 MJ
1.214+0.030
−0.029
363.3+2.5
−2.4
0.089+0.079
−0.060
c ≥ 1.86+0.16
−0.15
 MJ
1.853+0.045
−0.045
684.7+5.0
−4.9
0.278+0.069
−0.094

参考资料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752可免费查阅, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 Corben, P. M.; Stoy, R. H., Photoelectric Magnitudes and Colours for Bright Southern Stars, Monthly Notes of the Astronomical Society of Southern Africa, 1968, 27: 11, Bibcode:1968MNSSA..27...11C. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Soubiran, C.; et al, Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants, Astronomy and Astrophysics, March 2008, 480 (1): 91–101, Bibcode:2008A&A...480...91S, arXiv:0712.1370可免费查阅, doi:10.1051/0004-6361:20078788. 
  4. ^ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Sato, Bun'ei; et al, A Pair of Giant Planets around the Evolved Intermediate-Mass Star HD 47366: Multiple Circular Orbits or a Mutually Retrograde Configuration, January 18, 2016, arXiv:1601.04417可免费查阅. 
  5. ^ HR 2437 -- Star, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-01-21], (原始内容存档于2016-01-30). 

外部链接

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HD 47366
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