テーブルさん座アルファ星

テーブルさん座α星[1]
Alpha Mensae
星座 テーブルさん座
見かけの等級 (mv) 5.09[1]
分類 G型主系列星[1]
位置
元期:J2000.0[1]
赤経 (RA, α)  06h 10m 14.47353s[1]
赤緯 (Dec, δ) −74° 45′ 10.9583″[1]
赤方偏移 0.000116[1]
視線速度 (Rv) 34.9 km/s[1]
固有運動 (μ) 赤経: 121.80 ミリ秒/年[1]
赤緯: -212.34 ミリ秒/年[1]
年周視差 (π) 98.06 ± 0.14ミリ秒[1]
(誤差0.1%)
距離 33.26 ± 0.05 光年[注 1]
(10.2 ± 0.01 パーセク[注 1]
絶対等級 (MV) 5.0[注 2]
物理的性質
半径 0.91 R[2]
質量 1.103 ± 0.086 M[3]
表面重力 4.5 (log g)[3]
自転速度 1.7 km/s[3]
スペクトル分類 G7V [1]
表面温度 5,587 K[3]
色指数 (B-V) +0.72[4]
色指数 (U-B) +0.33[4]
色指数 (V-R) 0.38[要出典]
色指数 (R-I) +0.32[4]
金属量[Fe/H] 0.05[3]
年齢 54 億年[3]
他のカタログでの名称
CD -74 294[1]
FK5 239[1], HD 43834[1]
HIP 29271[1], HR 2261[1]
SAO 256274[1]
LTT 2490[1]
Template (ノート 解説) ■Project
大きさの比較
太陽 テーブルさん座α星
太陽 Exoplanet

テーブルさん座α星(テーブルさんざアルファせい、Alpha Mensae, α Men)は、テーブルさん座で最も明るい恒星である。

+5.09等級であり、星座内で最も明るい恒星としては、最も暗い。南方に位置するため、地球からは南半球緯度が高い場所でなければ良く見ることができないが、南中の頃には、赤道少し北からでも空の低いところに見ることができる。

黄色の主系列星で、太陽よりも若干小さく表面温度は低い。年齢は若干年老いている。この恒星は比較的大きな固有運動を持つ。周囲を公転する惑星は見つかっていないが、3.05秒(約30天文単位)離れた位置に赤色矮星を伴っている[5]

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 d e f g h i j k l m n o p q r s SIMBAD Astronomical Database”. Results for alf Men. 2015年12月8日閲覧。
  2. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001). “Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics”. Astronomy and Astrophysics 367: 521-524. doi:10.1051/0004-6361:20000451.  Note: see VizieR catalogue J/A+A/367/521; methods 66 and 6I.
  3. ^ a b c d e f Valenti, Jeff A.; Fischer, Debra A. (July 2005). “Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs”. The Astrophysical Journal Supplement Series 159 (1): 141-166. Bibcode2005ApJS..159..141V. doi:10.1086/430500.  Note: see VizieR catalogie J/ApJS/159/141.
  4. ^ a b c 輝星星表第5版
  5. ^ HD 43834B -- Star”. SIMBAD. Centre de Donnees astronomiques de Strasbourg. 2010年3月26日閲覧。

関連項目

外部リンク

  • Alpha Mensae”. SolStation. 2006年7月24日閲覧。
  • Kaler, Jim. “Alpha Mensae”. Stars. University of Illinois. 2006年7月24日閲覧。
  • Gl 231”. ARICNS. 2006年2月20日時点のオリジナルよりアーカイブ。2006年7月24日閲覧。
  • HD 43834”. Alcyone ephemeris. 2006年7月24日閲覧。

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