HD 101930

HD 101930 A / B
星座 ケンタウルス座
見かけの等級 (mv) 8.21[1] / 10.61[2]
位置
元期:J2000.0
赤経 (RA, α)  11h 43m 30.1133s[3]
赤緯 (Dec, δ) –58° 00′ 24.778″[3]
視線速度 (Rv) 18.36 km/s[3]
固有運動 (μ) 赤経: 16.679 ± 0.050 ミリ秒/[3]
赤緯: 349.076 ± 0.050 ミリ秒/年[3]
年周視差 (π) 33.51 ± 0.28ミリ秒[3]
(誤差0.8%)
距離 97.3 ± 0.8 光年[注 1]
(29.8 ± 0.2 パーセク[注 1]
絶対等級 (MV) 5.8[注 2]
物理的性質
半径 A: 0.79 R[4]
質量 0.90[4] / 0.70[5] M
表面重力 17 / 29 G[6][注 3]
スペクトル分類 K2 V+[3] + M0 - 1[2]
光度 A: 0.41 L[4]
表面温度 5,030 / 3,900 K[6]
色指数 (B-V) 0.908[1] / 1.09[7]
色指数 (V-I) 0.95[1]
金属量[Fe/H] 0.15 / 0.16[6]
年齢 3.48 - 5.39 ×109[8]
地球から見た位置 (HD 101930 Aとの関係)
位置角 8.3°[2]
角距離 73"[2]
他のカタログでの名称
CD-57 4096, GJ 3683, HIP 57172, LTT 4350, NLTT 28356, SAO 239322[3]
Template (ノート 解説) ■Project

HD 101930は、ケンタウルス座の方角に約97光年の距離にある8等級恒星である。橙色のK型主系列星で、太陽より若干暗く冷たい。

星系

HD 101930は、二重星として知られ、明るいK型星がHD 101930 A、そこから北に73程離れた位置にある11等星TYC 8638 366 1HD 101930 Bとして、ワシントン重星カタログにも収録されている[9]。HD 101930 Bは、アメリカ海軍天文台CCD星図カタログなどに基づいて固有運動を調べると、HD 101930 Aと共通していることがわかり、両者は物理的に結びついた連星であると考えられる[2]

惑星系

2005年に、主星の周囲を公転する太陽系外惑星の存在が公表された。この惑星HD 101930 bは、高精度視線速度系外惑星探査装置(HARPS)による視線速度法の観測によって発見された[10]

HD 101930 Aの惑星[10]
名称
(恒星に近い順)
質量 軌道長半径
天文単位
公転周期
()
軌道離心率 軌道傾斜角 半径
b > 0.30 MJ 0.302 70.46 ± 0.18 0.11 ± 0.02

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
  3. ^ 出典での表記は、

出典

  1. ^ a b c ESA (1997), The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission, ESA SP Series, 1200, Noordwijk, Netherlands: ESA Publications Division, Bibcode1997ESASP1200.....E, ISBN 9290923997 
  2. ^ a b c d e Mugrauer, M.; Seifahrt, A.; Neuhäuser, R. (2007-07), “The multiplicity of planet host stars - new low-mass companions to planet host stars”, Monthly Notices of the Royal Astronomical Society 378 (4): 1328-1334, Bibcode2007MNRAS.378.1328M, doi:10.1111/j.1365-2966.2007.11858.x 
  3. ^ a b c d e f g h HD 101930 -- High proper-motion Star”. SIMBAD. Centre de Données astronomiques de Strasbourg. 2018年3月9日閲覧。
  4. ^ a b c Ghezzi, L.; et al. (2010-09), “Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity”, Astrophysical Journal 720 (2): 1290-1302, Bibcode2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290 
  5. ^ Önehag, A.; et al. (2012-06), “M-dwarf metallicities. A high-resolution spectroscopic study in the near infrared”, Astronomy & Astrophysics 542: A33, Bibcode2012A&A...542A..33O, doi:10.1051/0004-6361/201118101 
  6. ^ a b c Lindgren, Sara; Heiter, Ulrike; Seifahrt, Andreas (2016-02), “Metallicity determination of M dwarfs. High-resolution infrared spectroscopy”, Astronomy & Astrophysics 586: A100, Bibcode2016A&A...586A.100L, doi:10.1051/0004-6361/201526602 
  7. ^ Høg, E.; et al. (2000-05), “Construction and verification of the Tycho-2 Catalogue”, Astronomy & Astrophysics 357: 367-386, Bibcode2000A&A...357..367H 
  8. ^ Saffe, C.; Gómez, M.; Chavero, C. (2005-11), “On the ages of exoplanet host stars”, Astronomy & Astrophysics 443 (2): 609-626, Bibcode2005A&A...443..609S, doi:10.1051/0004-6361:20053452 
  9. ^ Mason, Brian D.; et al. (2018-02), “The Washington Visual Double Star Catalog”, VizieR On-line Data Catalog: B/wds, Bibcode2018yCat....102026M 
  10. ^ a b Lovis, C.; et al. (2005-07). “The HARPS search for southern extra-solar planets III. Three Saturn-mass planets around HD 93083, HD 101930 and HD 102117”. Astronomy & Astrophysics 437 (3): 1121-1126. Bibcode2005A&A...437.1121L. doi:10.1051/0004-6361:20052864. 

関連項目

外部リンク

座標: 星図 11h 43m 30.1133s, −58° 00′ 24.778″

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