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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Zeta Virginis ： ウィキペディア英語版 Zeta Virginis Zeta Virginis (ζ Vir, ζ Virginis) is a star in the zodiac constellation of Virgo. Zeta Virginis has the proper name Heze, which is of unclear origin. It is visible to the naked eye with has an apparent visual magnitude is +3.376 〔 and is located about a half degree south of the celestial equator at a distance of from Earth.〔 ζ Virginis is a main sequence star with a spectral class A3 V,〔 indicating that it is generating energy through the nuclear fusion of hydrogen at its core. This energy is being radiated from its outer envelope at an effective temperature of 8,247 K,〔 giving Zeta Virginis the white hue of an A-type star.〔 It has twice the mass and double the radius of the Sun and is about a half billion years old.〔〔 In 2010, a low mass stellar companion was discovered, ζ Virginis B. The object has not been under observation for a sufficient length of time to determine accurate orbital elements. However, the pair are estimated to be orbiting at an average separation of at least 24.9 Astronomical Units and an orbital eccentricity of 0.16 or more. Their orbital period is a minimum of 124 years. This companion may be a red dwarf star, which would explain the observed X-ray flux from this system.〔 ==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「Zeta Virginis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.