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HD 34445

HD 34445
观测资料
历元 J2000.0
星座 猎户座
星官
赤经 05h 17m 40.9804s[1]
赤纬 +07° 21′ 12.053″[1]
视星等(V) 7.31 ± 0.03[2]
特性
光谱分类G0 V[2]
B−V 色指数0.661 ± 0.015[2]
天体测定
径向速度 (Rv)−78.906 ± 0.0082[3] km/s
自行 (μ) 赤经:−0.723[1] mas/yr
赤纬:−146.869[1] mas/yr
视差 (π)22.04 ± 0.29[1] mas
距离148 ± 2 ly
(45.4 ± 0.6 pc)
绝对星等 (MV)4.04 ± 0.10[2]
详细资料
质量1.07 ± 0.02[2] M
半径1.38 ± 0.08[2] R
表面重力 (log g)4.21 ± 0.08[2]
亮度2.01 ± 0.2[2] L
温度5836 ± 44[2] K
金属量+0.14 ± 0.04[2]
自转~22 d[4]
自转速度 (v sin i)2.7 ± 0.5 km/s
年龄8.5 ± 2.0[2] Gyr
其他命名
BD+07° 855, HIP 24681, SAO 112601[5]
参考数据库
SIMBAD资料
系外行星数据库英语Exoplanet Archive资料
系外行星百科资料

HD 34445是一颗视星等7的黄矮星,在天球上位于猎户座盖亚任务恒星视差量测结果显示它距离地球约148光年(45.4秒差距)。

概要

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HD 34445的年龄为85亿年,体积、表面温度、光度和质量都较太阳大[2]。它的金属量也较太阳高40%[note 1]。2004年该恒星旁发现一颗气态巨行星,但直到2009年才确认其存在[4]。2017年时天文学家在HD 34445旁再发现5颗行星[2]。6颗行星的质量下限都明显大于地球,从16.8 M🜨到200.0 M🜨[2]

行星系

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HD 34445的行星系[2]
成员
(依恒星距离)
质量 半长轴
(AU)
轨道周期
()
离心率 倾角 半径
e ≥0.0529 ± 0.0089 MJ 0.2687 ± 0.0019 49.175 ± 0.045 0.090 ± 0.062
d ≥0.097 ± 0.13 MJ 0.4817 ± 0.0033 117.87 ± 0.18 0.027 ± 0.051
c ≥0.168 ± 0.016 MJ 0.7181 ± 0.0049 214.67 ± 0.45 0.036 ± 0.071
f ≥0.119 ± 0.021 MJ 1.543 ± 0.016 676.8 ± 7.9 0.031 ± 0.057
b ≥0.629 ± 0.028 MJ 2.075 ± 0.016 1056.7 ± 4.7 0.014 ± 0.035
g ≥0.38 ± 0.13 MJ 6.36 ± 1.02 5700 ± 1500 0.032 ± 0.080

参见

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参考资料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 Gaia Collaboration. Gaia Data Release 1. Astronomy & Astrophysics. 2016, 595: A2. Bibcode:2016A&A...595A...2G. arXiv:1609.04172可免费查阅. doi:10.1051/0004-6361/201629512. 
  2. ^ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 Vogt, Steven S; Butler, R. Paul; Burt, Jennifer; Tuomi, Mikko; Laughlin, Gregory; Holden, Brad; Teske, Johanna K; Shectman, Stephen A; Crane, Jeffrey D; Díaz, Matías; Thompson, Ian B; Arriagada, Pamela; Keiser, Sandy. A Six-planet System around the Star HD 34445. The Astronomical Journal. 2017, 154 (5): 181. Bibcode:2017AJ....154..181V. arXiv:1710.07337可免费查阅. doi:10.3847/1538-3881/aa8b61. 
  3. ^ Soubiran, C.; et al. The catalogue of radial velocity standard stars for Gaia. I. Pre-launch release. Astronomy & Astrophysics. 2013, 552: 11. Bibcode:2013A&A...552A..64S. arXiv:1302.1905可免费查阅. doi:10.1051/0004-6361/201220927. A64. 
  4. ^ 4.0 4.1 Howard, Andrew W.; et al. The California Planet Survey. I. Four New Giant Exoplanets. The Astrophysical Journal. 2010, 721 (2): 1467–1481. Bibcode:2010ApJ...721.1467H. arXiv:1003.3488可免费查阅. doi:10.1088/0004-637X/721/2/1467. 
  5. ^ [ HD 34445] 请检查|url=值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. [19 November 2017]. 

注释

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  1. ^ 金属量以对数形式表示。100.14 ≈ 1.4


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HD 34445
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