翻訳と辞書 Words near each other ・ Pi de Bruijn ・ Pi de les Tres Branques ・ Pi Delta Kappa ・ Pi Delta Phi ・ Pi Delta Psi ・ Pi Draconis ・ Pi Epsilon ・ Pi Eridani ・ Pi function ・ Pi Gamma Mu ・ Pi Glilot bombing attempt ・ Pi Goun Tong ・ Pi Gruis ・ Pi Guangye ・ Pi helix ・ Pi Herculis ・ Pi Hongyan ・ Pi Hydrae ・ Pi in the Sky ・ Pi interaction ・ Pi Islands ・ Pi Josephson junction ・ Pi Kappa Alpha ・ Pi Kappa Chi ・ Pi Kappa Delta ・ Pi Kappa Lambda ・ Pi Kappa Phi ・ Pi Kappa Sigma ・ Pi Kharabeh Darrehna ・ Pi Kogi Enavot Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pi Herculis ： ウィキペディア英語版 Pi Herculis Pi Herculis (π Her, π Herculis) is a third-magnitude star in the constellation Hercules. As one of the four stars in the Keystone asterism (see yellow quadrangle) is one of the more easily recognized in the constellation. It has an apparent visual magnitude of +3.2,〔 which is visible to the naked eye and makes it one of the brighter members of the constellation. The Hipparcos satellite mission estimated its distance at roughly 115 parsecs from Earth, or about 377 light years away. The overall reduction in the star's visual magnitude due to extinction from the intervening matter is 0.11.〔 == Properties == Pi Herculis is a bright giant star with a stellar classification of K3 II.〔〔 P.C. Keenan and R. E. Pitts (1980) graded it as a spectral type K3 IIab〔 and it is sometimes listed with this alternate classification. The star is enormous compared to the Sun, having a mass that is 4.5 times solar and a radius approximately 60 times depending on which wavelength the star's angular diameter is measured at. Due to limb darkening, all giant and supergiant stars present unique challenges when measuring their photosphere. This orange-hued giant shines with 1,330 times the luminosity of the Sun.〔 It is a low-amplitude photometric variable star showing a typical change of roughly 0.0054 in magnitude over a 24-hour period.〔 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「Pi Herculis」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.