K2-58

K2-58
星座 みずがめ座
見かけの等級 (mv) 12.13
分類 恒星
位置
元期:J2000
赤経 (RA, α)  22h 15m 17.2364s[1]
赤緯 (Dec, δ) −14° 02′ 59.3151″[1]
視線速度 (Rv) 6.5±0.8 km/s
固有運動 (μ) 赤経: 4.67±0.02 ミリ秒/年[2]
赤緯: -11.11±0.02 ミリ秒/年[2]
年周視差 (π) 5.4932 ± 0.0194ミリ秒[2]
（誤差0.4%）
距離 594 ± 2 光年[注 1]
（182 ± 0.6 パーセク[注 1]）
軌道要素と性質
惑星の数 3
物理的性質
半径 0.803+0.034
−0.020 R☉[3]
質量 0.858+0.022
−0.027 M☉[3]
表面重力 4.5 cgs[4]
自転速度 2.2±0.5 km/s[4]
スペクトル分類 K2
表面温度 5038 K[4]
金属量[Fe/H] 0.25[4]
他のカタログでの名称
EPIC 206026904, 2MASS J22151722-1402593, Gaia DR2 2599975224481836672
■Template （■ノート ■解説） ■Project

K2-58（EPIC 206026904とも呼ばれる）とは、太陽系から約596光年離れたみずがめ座のG型主系列星である。金属が豊富な恒星であり、ヘリウムより重い元素が太陽の155%存在している[4]。K2-58は、K2-58系から太陽を観測したとすると、金星が太陽の前面を通過するトランジットを観測できる領域に存在する[5]。

惑星系

惑星系には、2016年に発見された3つの太陽系外惑星（K2-58b・K2-58c・K2-58d）が存在している[6][7][8][9]。

K2-58の惑星[9][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
c — 0.0350 2.53726 — 86.1+2.8
−7.3° 		1.62 R⊕
b — 0.0692 7.05254 — 88.9+0.8
−1.6° 		2.68 R⊕
d — 0.1517 22.8827 — 89.43+0.41
−0.81° 		1.71 R⊕

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

出典

  1. ^ a b "K2-58". SIMBAD. Centre de données astronomiques de Strasbourg. 2021年9月1日閲覧。
  2. ^ a b c Brown, A. G. A. (2021). “Gaia Early Data Release 3: Summary of the contents and survey properties”. アストロノミー・アンド・アストロフィジックス 649: A1. arXiv:2012.01533. Bibcode: 2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. 
  3. ^ a b c 275 candidates and 149 validated planets orbiting bright stars in K2 campaigns 0-10, (2018), arXiv:1802.05277 
  4. ^ a b c d e Spectral Properties of Cool Stars: Extended Abundance Analysis of Kepler Objects of Interest, (2018), arXiv:1804.00673 
  5. ^ Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0–8, (2019), arXiv:1907.10806 
  6. ^ “Exoplanet-catalog”. Exoplanet Exploration: Planets Beyond our Solar System. 2019年7月16日閲覧。
  7. ^ “EPIC 206026904”. www.cfa.harvard.edu. 2019年7月16日閲覧。
  8. ^ “Open Exoplanet Catalogue - K2-58 b”. www.openexoplanetcatalogue.com. 2019年7月16日閲覧。
  9. ^ a b 197 Candidates and 104 Validated Planets in K2’s First Five Fields, (2021), arXiv:1607.05263 

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