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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 Tauri ： ウィキペディア英語版 Delta Tauri The Bayer designation Delta Tauri (δ Tau, δ Tauri) is shared by three star systems in the constellation Taurus. They are all members of the Hyades star cluster. Because they are close to the ecliptic, these stars can be occulted by the Moon and, very rarely, by planets. The last occultation of δ¹ Tauri by a planet took place on 3 January 1818, when it was occulted by Venus. == δ¹ Tauri == δ¹ Tauri is a triple star approximately 153 light years from Earth and has the traditional name Hyadum II, which is Latin for "Second Hyad", and the name ''Eudora'' (Greek Ευδωρη), who was one of the Hyades sisters. The primary component, Delta-1 Tauri A, is an orange K-type giant with an apparent magnitude of +3.77. Delta-1 has a luminosity of 74 times that of the Sun and a radius of 11.6 times solar. Its mass is calculated to be 2.6 solar masses. The surface temperature of this star is 4965 kelvins. Its companion, Delta-1 Tauri B, is a 12th magnitude star separated by 107 arcseconds from the primary. It is most likely not physically related to the main star. However, observations of lunar occultations of this star has revealed a much closer, physically related, star that orbits the main star in an eccentric orbit with an average distance of 1.76 AU. This companion takes about 530 days to orbit the main star. 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 Tauri」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.