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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 153 Hilda ： ウィキペディア英語版 153 Hilda 153 Hilda is a large asteroid in the outer main belt, with a diameter of 170 km.〔 Because it is composed of primitive carbonaceous materials, it has a very dark surface. It was discovered by Johann Palisa on November 2, 1875, from the Austrian Naval Observatory at Pula.〔 The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.〔Lutz D. Schmadel, (''Dictionary of Minor Planet Names'', p.29 ).〕 ==Orbit and family== Hilda gives its name to an asteroid group called the Hilda family (or ''Hildas'' for short). It is not a true asteroid family, since the members are not physically related, but rather share similar orbital elements. The Hildas are locked in a 2:3 orbital resonance with Jupiter; since Jupiter takes 11.9 years to orbit the Sun while Hilda takes 7.9 years,〔 Jupiter orbits the Sun twice for every 3 orbits that Hilda completes. There are over 1,100 other objects known to be in a 2:3 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「153 Hilda」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.