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Xi Aquarii
Xi Aquarii (ξ Aqr, ξ Aquarii) is the Bayer designation for a binary star system in the equatorial constellation of Aquarius. It has the traditional name Bunda and is visible to the naked eye with an apparent visual magnitude of 4.7.〔 Based upon parallax measurements made during the Hipparcos mission, this system lies at a distance of around from Earth.〔
This is a single-lined spectroscopic binary system, which means that the presence of an unseen orbiting companion can be inferred from Doppler shifts in the spectral absorption lines. The two bodies orbit each other with a period of 8,016 days (22 y) and an eccentricity of 0.54.〔 The primary component is an A-type main sequence star with a stellar classification of A7 V.〔 It has about 1.9〔 times the mass of the Sun and is rotating rapidly with a projected rotational velocity of 170 km/s.〔 The orbital data is consistent with the secondary component being either a red dwarf or a white dwarf star.〔
==In culture==
In the catalogue of stars in the ''Calendarium'' of Al Achsasi al Mouakket, this star was designated Thanih Saad al Saaoud (تاني سعد السعود - ''taanii sa‘d al-su‘ūd''), which was translated into Latin as Secunda Fortunæ Fortunarum, meaning ''the second of luck of lucks''.〔 This star, along with β Aqr (Sadalsuud) and c Cet, were Saʽd al Suʽud (سعد السعود), the Luck of Lucks.〔〔
In Chinese, (), meaning ''Celestial Ramparts'', refers to an asterism consisting of ξ Aquarii, 46 Capricorni, 47 Capricorni, λ Capricorni, 50 Capricorni, 18 Aquarii, 29 Capricorni, 9 Aquarii, 8 Aquarii, ν Aquarii, 14 Aquarii, 17 Aquarii and 19 Aquarii.〔 ''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, ξ Aquarii itself is known as (, (英語:the First Star of Celestial Ramparts).)〔 (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.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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