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Messier 98, also known as ''M98'' or ''NGC 4192'', is an intermediate spiral galaxy located about 44.4〔 million light-years away in the constellation Coma Berenices, about 6° to the east of the bright star Denebola. It was discovered by French astronomer Pierre Méchain on 15 March 1781, along with nearby M99 and M100, and was cataloged by French astronomer Charles Messier on 13 April 1781 in his ''Catalogue des Nébuleuses & des amas d'Étoiles''.〔 Messier 98 has a blue shift and is approaching us at about 140 km/s.〔 The morphological classification of this galaxy is SAB(s)ab,〔 which indicates it is a spiral galaxy that displays mixed barred and non-barred features with intermediate to tightly-wound arms and no ring.〔 It is highly inclined to the line of sight at an angle of 74°〔 and has a maximum rotation velocity of 236 km/s.〔 The combined mass of the stars in this galaxy is an estimated 76 billion () times the mass of the Sun. It contains about 4.3 billion solar masses of neutral hydrogen and 85 million solar masses in dust.〔 The nucleus is active, displaying characteristics of a "transition" type object. That is, it shows properties of a LINER-type galaxy intermixed with an H II region around the nucleus.〔 NGC 4192 is a member of the Virgo Cluster, which is a large, relatively nearby cluster of galaxies.〔 About 750 million years ago, NGC 4192 may have interacted with the large spiral galaxy NGC 4254. The two are now separated by a distance of .〔 __NOTOC__ == Gallery == File:HST 05375.jpg|M98, as seen by the Hubble Space Telescope 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「Messier 98」の詳細全文を読む スポンサード リンク
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