ケプラー1649

ケプラー1649
Kepler-1649
ケプラー1649系の想像図（手前の惑星はケプラー1649c）
ケプラー1649系の想像図（手前の惑星はケプラー1649c）
星座 はくちょう座[1]
分類 主系列星
赤色矮星
位置
元期:J2000.0
赤経 (RA, α)  19h 30m 00.9006122986s[2]
赤緯 (Dec, δ) 41° 49′ 49.513849537″[2]
固有運動 (μ) 赤経: -135.842 ミリ秒/年[2]
赤緯: -99.232 ミリ秒/年[2]
年周視差 (π) 10.8187 ± 0.0637ミリ秒[2]
（誤差0.6%）
距離 301 ± 2 光年[注 1]
（92.4 ± 0.5 パーセク[注 1]）
軌道要素と性質
惑星の数 2
物理的性質
半径 0.2317±0.0049 R☉[3]
質量 0.1977±0.0051 M☉[3]
表面重力 5.004±0.021 cgs[3]
スペクトル分類 M5V[4]
表面温度 3240±61 K[3]
金属量[Fe/H] −0.15±0.11[3]
他のカタログでの名称
KOI-3138, KIC 6444896, 2MASS J19300092+4149496[2]
■Template （■ノート ■解説） ■Project

ケプラー1649とは、0.232太陽半径、0.198太陽質量、-0.15[Fe/H]の金属量を持つスペクトル分類がM5V型の赤色矮星である[4][3]。

確認された2つの太陽系外惑星、ケプラー1649bとケプラー1649cがケプラー1649の周囲を公転している。ケプラー1649bは金星に似ているが、ケプラー1649cは地球に似た潜在的に居住可能な惑星である[5][6]。

ケプラー1649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 — 0.0514±0.0028 8.689099±0.000025 — 89.150+0.110
−0.079° 		1.017±0.051 R⊕
c — — 19.53527±0.00010 — 89.339±0.056° 1.06+0.15
−0.10 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. ^ Staff (2 August 2008). “Finding the constellation which contains given sky coordinates”. DJM.cc. 16 December 2020閲覧。
  2. ^ a b c d e f “Kepler-1649 -- High proper-motion Star”. SIMBAD. Centre de Données astronomiques de Strasbourg. 16 December 2020閲覧。
  3. ^ a b c d e f g “Kepler-1649”. NASA Exoplanet Archive. 16 December 2020閲覧。
  4. ^ a b “The Extrasolar Planet Encyclopaedia — Kepler-1649 c”. exoplanet.eu. 2020年12月12日閲覧。
  5. ^ “The Habitable Exoplanets Catalog - Planetary Habitability Laboratory @ UPR Arecibo”. phl.upr.edu. 2020年12月12日閲覧。
  6. ^ “An Exoplanet in the Habitable Zone Found After Hiding in Kepler Data” (英語). Discover Magazine. 2020年12月12日閲覧。

関連項目

探査機
主な恒星
主な惑星
K2ミッションで発見された主な惑星
一覧
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