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Theta Aquarii
Theta Aquarii (θ Aqr, θ Aquarii) is the bayer designation for a star in the equatorial constellation of Aquarius. It has the traditional name Ancha; Medieval Latin for "the haunch". Visible to the naked eye at apparent magnitude 4.175,〔 it is located at a distance of around from Earth.〔 Since it is near the ecliptic it can be occulted by the Moon, or very rarely by planets.
In Chinese, (), meaning ''Weeping'', refers to an asterism consisting of θ Aquarii and ρ Aquarii.〔 ''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, θ Aquarii itself is known as (, (英語:the Second Star of Weeping).).〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕 Possibly, the name Lei meaning ''tears (weeping)'' in Chinese, was appear from the Chinese name for this star〔(Richard Hinckley Allen: Star Names — Their Lore and Meaning: Aquarius )〕
Ancha belongs to the spectral class G8 with a luminosity class of III–IV suggesting that, at an age of 437〔 million years, this star is part way between the subgiant and giant stages of its evolution. Estimates of the star's mass range from 2.39〔 to 2.78〔 times the Sun's mass, with a radius of about 12〔 times that of the Sun. It is radiating from 72〔 to 83〔 times as much luminosity as the Sun from its enlarged outer envelope at an effective temperature of 4,864 K.〔 At this heat, the star glows with the yellow hue of a G-type star.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Theta Aquarii」の詳細全文を読む
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