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Rho Aquilae : ウィキペディア英語版
Rho Aquilae


Rho Aquilae (ρ Aql, ρ Aquilae) is the Bayer designation for a star in the northern constellation of Delphinus – it moved across the border from Aquila into Delphinus in 1992.〔 It has an apparent visual magnitude of 4.94〔 and is bright enough to be seen with the naked eye in good conditions. The annual parallax shift of this star is 21.75 mas,〔 which corresponds to a physical distance of around from Earth.
This star has the traditional name Tso Ke, from the Cantonese 左旗 ''jo keih'' meaning "the left flag". In Chinese, ( in Mandarin), meaning ''Left Flag'', refers to an asterism consisting of ρ Aquilae, α Sagittae, β Sagittae, δ Sagittae, ζ Sagittae, γ Sagittae, 13 Sagittae, 11 Sagittae and 14 Sagittae.〔 ''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, ρ Aquilae itself is known as (, (英語:the Ninth Star of Left Flag).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日 )〕
Rho Aquilae is an A-type main sequence star with a stellar classification of A2 V.〔 This star is about 50 to 120 million years old and it displays an excess emission of infrared radiation that may be explained by a circumstellar disk of dust.〔〔
==References==


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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