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Xi Serpentis
Xi Serpentis (ξ Ser, ξ Serpentis) is a triple star system in the constellation Serpens. The primary star, Xi Serpentis A, is a yellow-white F-type giant with an apparent magnitude of +3.54. It is a spectroscopic binary with an orbital period of 2.29 days. A 13th magnitude companion, Xi Serpentis B, is located 25 arcseconds from the primary pair. Xi Serpentis is approximately 105 light years from Earth.
==Name==
In Chinese, ''Tiān Shì Zuǒ Yuán'' (), meaning ''Left Wall of Heavenly Market Enclosure'', refers to an asterism which is represent eleven old states (and region) in China which is marking the left borderline of the enclosure, consisting of ξ Serpentis, δ Herculis, λ Herculis, μ Herculis, ο Herculis, 112 Herculis, ζ Aquilae, η Serpentis, θ1 Serpentis, ν Ophiuchi and η Ophiuchi.〔 ''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 Serpentis itself is known as (, (英語:the Tenth Star of Left Wall of Heavenly Market Enclosure)), representing the region of Nanhai (南海, lit. meaning ''southern sea'')〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日 )〕〔 (English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name ), 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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