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Gamma Centauri (γ Cen, γ Centauri) is a star in the southern constellation Centaurus. It has the proper name Muhlifain,〔Kunitzsch, P., ''Arabische Sternnamen in Europa'', Otto Harrassowitz, Wiesbaden, p.188.〕 not to be confused with Muliphein, which is γ Canis Majoris; both names derive from the same Arabic root. Gamma Centauri is a double star located about from Earth. The combined apparent visual magnitude of the pair is +2.17,〔 although individually they are third magnitude stars.〔 The stellar classification of the pair is A1IV+,〔 suggesting they are A-type subgiant stars in the process of becoming giants. Individually, their stellar classifications are sometimes listed as A0III, which would mean they have already become giants.〔 In 2000, the pair had an angular separation of 1.217 arcseconds with a position angle of 351.9°.〔 Their positions have been observed since 1897, which is long enough to estimate an orbital period of 84.5 years and a semimajor axis of 0.93 arcseconds.〔 At the distance of this system, this is equivalent to a linear distance of about 93 Astronomical Units.〔 The star Tau Centauri is relatively close to Gamma Centauri, with an estimated separation of .〔 ==Etymology== In Chinese, (), meaning ''Arsenal'', refers to an asterism consisting of γ Centauri, ζ Centauri, η Centauri, θ Centauri, 2 Centauri, HD 117440, ξ1 Centauri, τ Centauri, D Centauri and σ Centauri.〔 ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.〕 Consequently, γ Centauri itself is known as (, (英語:the Seventh Star of Arsenal).)〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕 The people of Aranda and Luritja tribe around Hermannsburg, Central Australia named Iritjinga, "The Eagle-hawk", a quadrangular arrangement comprising this star, δ Cen (Ma Wei), δ Cru (Palida) and γ Cru (Gacrux), .〔p. 8, (''Explorers of the southern sky: a history of Australian astronomy'' ), Raymond Haynes, Cambridge, Cambridge University Press, 1996.〕 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「Gamma Centauri」の詳細全文を読む スポンサード リンク
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