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NGC 4030
NGC 4030 is a grand design spiral galaxy〔 located about 64〔 million light years away in the constellation Virgo. With an apparent visual magnitude of 10.6, it is visible with a small telescope as a 3 arc minute wide feature about 4.75° to the southeast of the star Beta Virginis.〔 It is inclined by an angle of 47.1°〔 to the line of sight from the Earth and is receding at a velocity of 1,465 km/s.〔 The morphological classification of NGC 4030 in the De Vaucouleurs system is SA(s)bc,〔 which indicates a spiral structure (SA) with no bar (s) and moderate to loosely wound arms (bc).〔 The inner part of the galaxy shows a complex structure with multiple spiral arms, which becomes a symmetric, double arm pattern beyond 49″ from the core.〔 The central bulge is relatively young with an estimated age of two billion years,〔 while the nucleus is inactive.〔 In 2007, a supernova explosion was discovered in the galaxy from images taken on February 19 from the 1 m Swope telescope at Las Campanas Observatory in Chile. Designated SN 2007aa, it was a type IIP〔 supernova positioned 68″.5 north and 60″.8 east of the galactic nucleus.〔 The progenitor was a red giant star with 8.5–16.5 times the mass of the Sun.〔 ==References==
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「NGC 4030」の詳細全文を読む
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