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Beta Delphini
Beta Delphini (Beta Del, β Delphini, β Del) is a binary star in the constellation of Delphinus. As a practical joke, the astronomer Niccolò Cacciatore gave it the name Rotanev, which is a reversal of his Latinized family name, ''Venator''.〔 The name first appeared in Giuseppe Piazzi's Palermo Catalogue, published in 1814. Beta Delphini was found to be a binary star system in 1873 by the American astronomer S. W. Burnham.〔
In Chinese, (), meaning ''Good Gourd'', refers to an asterism consisting of β Delphini, α Delphini, γ2 Delphini, δ Delphini, and ζ Delphini.〔 ''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 Delphini itself is known as (, (英語:the Second Star of Good Gourd).).〔 (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.〕
This system consists of a pair of F-type stars stars that orbit each other with a period of 26.66 years and an eccentricity of 0.36. The plane of the orbit is inclined by an angle of 61° to the line of sight from the Earth. The two stars have an angular separation of about 0.44 arcseconds, making them a challenge to resolve with a telescope. The larger member of the pair is a giant star with 1.75 times the mass〔 and 24 times the luminosity of the Sun,〔 while the secondary component is a subgiant star that has 1.47 times the Sun's mass〔 and around 8 times the Sun's luminosity.〔 The system is around 1.8 billion years old.〔
==See also==
* Sualocin and Rotanev
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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