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Epsilon1 Arae : ウィキペディア英語版
Epsilon1 Arae


Epsilon1 Arae (ε1 Ara, ε1 Arae) is the Bayer designation for a star in the constellation Ara, the Altar. It is visible to the naked eye with an apparent visual magnitude of +4.1〔 Based upon an annual parallax shift of 9.04 mas,〔 this star is around distant from the Earth.
ε1 Arae is an evolved giant star〔 with a stellar classification of K3 III.〔 It is around 74% more massive than the Sun. At an age of about 1.7 billion years, the outer envelope of the star has expanded to almost 34 times the Sun's radius.〔 It is radiating energy into space at an effective temperature of 4,176 K,〔 giving it the orange-hued glow of a K-type star.〔
ε1 Arae was known as (meaning: "the 1st (star) of '") in traditional Chinese astronomy.〔Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", ''Annales de l'Observatoire Astronomique de Zô-Sé''.〕〔 (Yi Shi Tong) (1981): .〕
Allen erroneously called it as ''Tso Kang'' ().〔 He probably confused constellation "Ara" with "Ari". ''Tso Kang'' was lain in Aries.〔〔
== 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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