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Zeta Aurigae
Zeta Aurigae (ζ Aur, ζ Aurigae) is the Bayer designation for a binary star system in the northern constellation of Auriga. It has the traditional names Haedus and Sadatoni. Based upon parallax measurements made during the Hipparcos mission, this system is approximately distant from the Earth. It has a combined apparent visual magnitude of 3.75,〔 which is bright enough to be seen with the naked eye.
This is an eclipsing binary system with the orbital plane being oriented close to the line of sight from the Earth; the inclination of this system is estimated as 87.0°.〔 As a result, an eclipse of one star by the other occurs during each orbit, causing the magnitude to decrease to +3.99. The pair have an orbital period of 972 days (2.66 years) and an eccentricity of 0.4.〔 The primary component has been categorized as a K-type bright giant or supergiant star. Its companion is a B-type main sequence star of stellar classification B5 V or B7 V.〔〔
==Etymology==
It has the traditional names Haedus (also Hoedus) and Sadatoni (rarely ''Saclateni).'' It is one of the two ''hædi'' (kids) of the she-goat Capella, the other being Hoedus II, Eta Aurigae. The name Sadatoni is from the Arabic الساعد الثاني ''as-sācid aθ-θānī'' "the second arm (of the charioteer)". The rare traditional name ''Azaleh'' is shared (in the form ''Hassaleh'') with Iota Aurigae.
In Chinese, (), meaning ''Pillars'', refers to an asterism consisting of ζ Aurigae, ε Aurigae, η Aurigae, υ Aurigae, ν Aurigae, τ Aurigae, χ Aurigae and 26 Aurigae.〔 ''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, ζ Aurigae itself is known as (, (英語:the Second Star of Pillars).)〔 (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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