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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 10 Hygiea ： ウィキペディア英語版 10 Hygiea 10 Hygiea is the fourth largest asteroid in the Solar System by volume and mass, and it is located in the asteroid belt. With somewhat oblong diameters of 350–500 km and a mass estimated to be 2.9% of the total mass of the belt,〔"Mass of 10 Hygiea" 0.445 / ("Mass of Mbelt" ) 15 = 0.0296〕 it is the largest of the class of dark C-type asteroids with a carbonaceous surface. Despite its size, it appears very dim when observed from Earth. This is due to its dark surface and larger-than-average distance from the Sun. For this reason, several smaller asteroids were observed before Annibale de Gasparis discovered Hygiea on April 12, 1849. At most oppositions, Hygiea has a magnitude that is four magnitudes dimmer than Vesta's, and observing it will require at least a telescope. However, while at a perihelic opposition, it may be observable with 10x50 binoculars. ==Discovery and name== Hygiea was discovered by Annibale de Gasparis on April 12, 1849, in Naples, Italy. It was the first of his nine asteroid discoveries. The director of the Naples observatory, Ernesto Capocci, named the asteroid. He chose to call it ''Igea Borbonica'' ("Bourbon Hygieia") in honor of the ruling family of the Kingdom of the Two Sicilies where Naples was located.〔 In 1852, John Russell Hind wrote that "it is universally termed ''Hygeia'', the unnecessary appendage 'Borbonica' being dropped". The name comes from Hygieia, the Greek goddess of health, daughter of Asclepius (Aesculapius for the Romans). The name was often spelled Hygeia in the nineteenth century, for example in the ''Monthly Notices of the Royal Astronomical Society''. 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「10 Hygiea」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.