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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 Delta Draconis ： ウィキペディア英語版 Delta Draconis Delta Draconis (δ Dra, δ Draconis) is a yellow star in the constellation Draco. It has the traditional names Aldib, Altais〔 (the goat) and Nodus Secundus.〔 This star has an apparent visual magnitude of 3.0,〔 making it easily visible to the naked eye. Parallax measurements with the Hipparcos satellite yield a distance estimate of from Earth.〔 ==Properties== Delta Draconis is a giant star with a stellar classification of G9 III. This indicates that, at an estimated age of 800 million years,〔 this star has exhausted the supply of hydrogen at its core and entered a later stage in its evolution. The angular diameter of the star is estimated as .〔 At a parallax of 32.54 mas, this corresponds to a physical radius equal to 11 times the solar radius.〔 It is radiating 59〔 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,820 K.〔 At this temperature, it is giving off the yellow-hued glow of a G-type star.〔 With a mass 2.32〔 times that of the Sun, this star will end its life as a white dwarf.〔 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「Delta Draconis」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.