HD 67087

HD 67087
星座 ふたご座[1]
見かけの等級 (mv) 8.04[2]
分類 F型主系列星[2]
位置
元期:J2000.0[2]
赤経 (RA, α)  08h 07m 39.7561404410s[2]
赤緯 (Dec, δ) +31° 33′ 04.743481196″[2]
赤方偏移 0.000002[2]
視線速度 (Rv) 0.62 km/s[2]
固有運動 (μ) 赤経: -16.505 ミリ秒/年[2]
赤緯: -37.693 ミリ秒/年[2]
年周視差 (π) 13.0396 ± 0.0560ミリ秒[2]
（誤差0.4%）
距離 250 ± 1 光年[注 1]
（76.7 ± 0.3 パーセク[注 1]）
絶対等級 (MV) 3.6[注 2]
物理的性質
半径 1.55 ± 0.32 R☉[3]
質量 1.36 ± 0.04 M☉[3]
表面重力 4.19 ± 0.06 (log g)[3]
自転速度 9.7 ± 0.5 km/s[3]
スペクトル分類 F8V[2]
光度 3.47 ± 0.75 L☉[3]
表面温度 6,330 ± 47 K[3]
色指数 (B-V) 0.53[3]
金属量[Fe/H] 0.25 ± 0.04[3]
年齢 14.5 ± 5.1 億年[3]
他のカタログでの名称
BD+31 1735[2]
Gaia DR2 877846136542812160[2]
GSC 02469-00686[2]
HIP 3976[2]
SAO 60580[2]
2MASS J08073975+3133049[2]
■Template （■ノート ■解説） ■Project
大きさの比較
太陽 HD 67087
太陽 Exoplanet

HD 67087は、ふたご座の方向にあるF型主系列星の恒星である。金属量が太陽より多く、年齢も14億年とかなり若い。

惑星系

2015年に岡山天体物理観測所で行われた観測によって2つの太陽系外惑星が発見された。これらの惑星はHD 1605とHD 1666を公転している太陽系外惑星と同時に発表された。

外側を公転しているHD 67087 cは軌道離心率0.76という極端な楕円軌道を描いている。これはさらに外側にある未知の天体の重力によってHD 67087 cの軌道が歪められている可能性があることを示している。しかし、今のところそのような伴天体は見つかっていない[1]。これは伴星を持つにも関わらず、惑星の軌道がほぼ真円であるHD 1605系とは対照的である[1]。

HD 67087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 ≥ 3.06+0.22
−0.20 MJ 		1.08 ± 0.04 352.2+1.7
−1.6 		0.17 ± 0.07 — —
c ≥ 4.85+10.0
−3.61 MJ 		3.86+0.43
−0.37 		2374+193
−156 		0.76+0.17
−0.24 		— —

関連項目

脚注

注釈

  1. ^ a b パーセクは1 ÷ 年周視差（秒）より計算、光年は1÷年周視差（秒）×3.2615638より計算
  2. ^ 視等級 + 5 + 5×log（年周視差（秒））より計算。小数第1位まで表記

出典

  1. ^ a b c “金属過剰の太陽型星3つに系外惑星を検出”. AstroArts (2015年10月21日). 2015年12月6日閲覧。
  2. ^ a b c d e f g h i j k l m n o p q “Result for HD 67087”. SIMBAD Astronomical Database. CDS. 2018年10月7日閲覧。
  3. ^ a b c d e f g h i j Hiroki Harakawa; Bunei Sato et al. (2015). “Five New Exoplanets Orbiting Three Metal-Rich, Massive Stars: Two-Planet Systems Including Long-Period Planets, and an Eccentric Planet”. The Astrophysical Journal 806 (1): 11. arXiv:1503.07636. Bibcode: 2015ApJ...806....5H. doi:10.1088/0004-637X/806/1/5. https://iopscience.iop.org/article/10.1088/0004-637X/806/1/5/meta. 

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