翻訳と辞書 Words near each other ・ Urshu ・ Urshult ・ Ursi ・ Ursi Walliser ・ Ursia ・ Ursia (disambiguation) ・ Ursicinus ・ Ursicinus (Bishop of Ravenna) ・ Ursicinus (Roman general) ・ Ursicinus of Brescia ・ Ursicinus of Ravenna ・ Ursicinus of Saint-Ursanne ・ Ursicollum ・ Ursid ・ Ursid hybrid ・ Ursids ・ Ursin Durand ・ Ursina ・ Ursina Greuter ・ Ursina Haller ・ Ursina Lardi ・ Ursina, Pennsylvania ・ Ursinae ・ Ursine colobus ・ Ursine howler ・ Ursine tree-kangaroo ・ Ursine, Nevada ・ Ursini ・ Ursini (surname) ・ Ursinia 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 Ursids ： ウィキペディア英語版 Ursids The Ursids (URS) meteor activity begins annually around December 17 and runs for a week plus, until the 25th or 26th. This meteor shower is named for its radiant point which is located near the star Beta Ursae Minoris (Kochab) in the constellation Ursa Minor. == History == The Ursids were probably discovered by William F. Denning who observed them for several years around the start of the 20th century.〔 While there were sporadic observations after, the first coordinated studies of shower didn't begin until Dr. A. Bečvář observed an outburst of 169 per hour in 1945.〔 Further observations in the 1970s and ongoing to current have established a relationship with comet 8P/Tuttle.〔 Peter Jenniskens and Esko Lyytinen discovered that outbursts could happen when comet Tuttle was at aphelion because some meteorids get trapped in the 7/6 orbital resonance with Jupiter. 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「Ursids」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.