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Epsilon Apodis
Epsilon Apodis (ε Aps, ε Apodis) is the Bayer designation for a star in the southern circumpolar constellation of Apus. It has an apparent visual magnitude of 5.06,〔 which is bright enough to be viewed from dark suburban skies. Based upon parallax measurements, it is at a distance of roughly from Earth.〔
Based upon a stellar classification of B3 V,〔 this is a massive, B-type main sequence star that is generating energy through the fusion of hydrogen at its core. Epsilon Apodis has more than six〔 times the mass of the Sun and nearly four〔 times the Sun's radius. It is radiating 1,614〔 times as much luminosity as the Sun from its outer envelope at an effective temperature of 17,050 K.〔 At this heat, it has a blue-white glow that is a characteristic of B-type stars.〔
It is spinning rapidly, with a projected rotational velocity of 255 km/s 〔 giving a lower bound for the azimuthal velocity along the equator. Epsilon Apodis is classified as a Gamma Cassiopeiae type〔 variable star and its brightness varies between magnitudes 4.99 and 5.04.〔
==Naming==
In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, (), meaning ''Exotic Bird'', refers to an asterism consisting of ε Apodis, ζ Apodis, ι Apodis, β Apodis, γ Apodis, δ Octantis, δ1 Apodis, η Apodis and α Apodis. Consequently, ε Apodis itself is known as (, (英語:the Ninth Star of Exotic Bird).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日 )〕
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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