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Beta Aquilae (β Aql, β Aquilae) is a star in the constellation Aquila. It has the traditional name Alshain from the Perso-Arabic term الشاهين ''aš-šāhīn'' "the (peregrine) falcon", perhaps by folk etymology from the Persian ''šāhīn tarāzū'' (or possibly ''šāhīn tara zed''; see γ Aquilae), the Persian name for the asterism α, β and γ Aquilae. In Chinese, (), meaning ''River Drum'', refers to an asterism consisting of β Aquilae, Altair and γ Aql.〔 ''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, β Aquilae itself is known as (, (英語:the First Star of River Drum).)〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 26, 2008.〕 In the catalogue of stars in the ''Calendarium'' of Al Achsasi al Mouakket, this star was designated Unuk al Ghyrab (عنق ألغراب - ''únuq al-ghuraab''), which was translated into Latin as Collum Corvi, meaning ''the crow's neck''. Beta Aquilae has magnitude 3.71 and is of spectral class G8IV. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.〔 It is approximately 44.7 light years from Earth. It has a 12th magnitude optical companion, β Aquilae B, which is 13 arcseconds away in the sky. ==Cultural significance== In Chinese mythology, The Princess and the Cowherd, this star and γ Aql, are children of Niulang (牛郎, The Cowherd, Altair) and Zhinü (織女, The Princess, Vega). The Koori people of Victoria knew Alshain and γ Aquilae as the black swan wives of ''Bunjil'' (Altair), the wedge-tailed eagle. 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「Beta Aquilae」の詳細全文を読む スポンサード リンク
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