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Rho Andromedae
Rho Andromedae (ρ And, ρ Andromedae) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.19,〔 which, according to the Bortle Dark-Sky Scale, is bright enough to be seen with the naked eye from dark suburban skies. Based upon parallax measurements, this star is at a distance of approximately from Earth.〔
The stellar classification of this star is F5 III,〔 indicating that it is in the giant stage of its stellar evolution. However, some sources list a classification of F5 IV,〔〔 suggesting that it may still be in the subgiant stage. The interferometry-measured angular diameter of this star is ,〔 which, at its estimated distance, equates to a physical radius of around 3.3 times the radius of the Sun.〔 The outer envelope is radiating around 20〔 times the luminosity of the Sun into space at an effective temperature of 6,471 K,〔 giving it the yellow-white hue of an F-type star.〔 It is about 1.3 billion years old.〔
X-ray emissions were detected from this star during the EXOSAT mission.〔
==Naming==
In Chinese, (), meaning ''Celestial Stable'', refers to an asterism consisting of ρ Andromedae, θ Andromedae and σ Andromedae. Consequently, ρ Andromedae itself is known as (, (英語:the Second Star of Celestial Stable).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 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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