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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 Cephei ： ウィキペディア英語版 Delta Cephei Delta Cephei (δ Cep, δ Cephei) is the Bayer designation for a quadruple star system〔 located approximately 887 light-years away in the northern circumpolar constellation of Cepheus, the King. At this distance, the visual magnitude of the star is diminished by 0.23 as a result of extinction caused by gas and dust along the line of sight.〔 It is the prototype of the Cepheid variable stars that undergo periodic changes in luminosity. ==Discovery== Delta Cephei was discovered to be variable by John Goodricke during 1784. He describes his first observation on October 19, 1784, followed by a regular series of observations most nights until December 28. Further observations were made during the first half of 1785, the variability was described in a letter dated June 28, 1785, and formally published on January 1, 1786. This was the second variable star of this type, with eta Aquilae being discovered just a few weeks earlier on September 10, 1784. 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 Cephei」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.