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Mu Boötis (μ Boo, μ Boötis) is a triple star system in the constellation Boötes. It has the traditional name Alkalurops (also ''Inkalunis, Clava,'' and ''Venabulum),'' and the Flamsteed designation 51 Boötis. Mu Boötis is approximately 121 light-years from Earth. The name Alkalurops is from Greek καλαύροψ ''kalaurops'' "shepherd's staff", through the Arabic. It is known as 七公六 (the Sixth Star of the Seven Excellencies) in Chinese.〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日 )〕 The primary component, μ¹ Boötis, is a yellow-white F-type subgiant with an apparent magnitude of +4.31. ==Position== Separated from the primary by 108 arcseconds in the sky is the binary star μ² Boötis, which has a combined spectral type of G1V and a combined brightness of +6.51 magnitudes. The components of μ² Boötis have apparent magnitudes of +7.2 and +7.8 and are separated by 2.2 arcseconds. They complete one orbit about their common centre of mass every 260 years. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Mu Boötis」の詳細全文を読む スポンサード リンク
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