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Alpha Comae Berenices (Alpha Com, α Com, α Comae Berenices) is a star in the constellation Coma Berenices (Berenice's Hair). Although it has the Bayer designation "alpha", at magnitude 4.32 it is actually fainter than Beta Comae Berenices. It has the traditional name Diadem. It is said to represent the crown worn by Queen Berenice. A name occasionally seen is Al Dafirah, from the Arabic الضفيرة ''ađ̧-đ̧afīrah'' "the braid". In Chinese, (), meaning ''Left Wall of Supreme Palace Enclosure'', refers to an asterism consisting of α Comae Berenices, η Virginis, γ Virginis, δ Virginis and ε Virginis.〔 ''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, α Comae Berenices itself is known as (, (英語:the Fifth Star of Left Wall of Supreme Palace Enclosure).),〔 (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.〕 representing (), meaning ''The First Eastern General''.〔 (English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕 東上將 (Dōngshǎngjiāng), westernized into Shang Tseang, but the name ''Shang Tseang'' was designated for "v Comae Berenices" by R.H. Allen and the meaning is "a Higher General" 〔(Richard Hinckley Allen: Star Names — Their Lore and Meaning: Coma Berenices )〕 ==Properties== It is a binary star, with almost equal components of magnitudes 5.05 m and 5.08 m orbiting each other with a period of 25.87 years. The system, estimated to be 65 light years distant, appears so nearly "edge-on" from the Earth that the two stars appear to move back-and-forth in a straight line with a maximum separation of only 0.7 arcsec. It is not known whether eclipses occur between the two components at periastron (minimum separation)—the only such passage since the determination of the orbit, in 1990, was not quantitatively followed by observers. The mean separation between them is approximately 10 A.U., about the distance between the Sun and Saturn. The binary star has a visual companion, CCDM J13100+1732C, of apparent magnitude 10.2, located 89 arcseconds away along a position angle of 345°.〔Entry 13100+1732, discoverer code STF1728, components AB-C, (The Washington Double Star Catalog ), United States Naval Observatory. Accessed on line September 3, 2008.〕 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「Alpha Comae Berenices」の詳細全文を読む スポンサード リンク
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