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Gamma Piscium
Gamma Piscium (Gamma Psc, γ Piscium, γ Psc) is a star approximately 138 light years away from Earth,〔 in the zodiac constellation of Pisces. It is a yellow star with a spectral type of G9 III, meaning it has a surface temperature of 4,885 K and is a giant star. It is slightly cooler than our Sun, yet it is 10〔 solar radii in size and shines with the light of 61 Suns.〔(【引用サイトリンク】 url=http://www.astro.uiuc.edu/~kaler/sow/gammapsc.html )〕 At an apparent magnitude of 3.7,〔 it is the second brightest star in the constellation Pisces, between Eta and Alpha. Once a white A2 star, it is 5.5 billion years old.
Gamma Piscium moves across the sky at three-quarters of an arcsecond per year, which at 138 light years corresponds to 153 kilometers per second. This suggests it is a visitor from another part of the Milky Way Galaxy; in astronomical terms, it will quickly leave the vicinity of the Sun. Its metallicity is only one-fourth that of the Sun, and visitors from outside the thin disk that composes the Milky Way tend to be metal-poor. It also has a low carbon-nitrogen content.〔 Gamma Piscium lies inside an asterism known as the "circlet of Pisces."〔(【引用サイトリンク】 url=http://www.space.com/spacewatch/spacewatch_001113.html )〕
==Naming==
In Chinese, (), meaning ''Thunderbolt'', refers to an asterism consisting of refers to an asterism consisting of γ Piscium, β Piscium, θ Piscium, ι Piscium and ω Piscium. Consequently, γ Piscium itself is known as (, (英語:the Second Star of Thunderbolt).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 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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