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NGC 3242, commonly known as the Ghost of Jupiter, is a planetary nebula located in the constellation Hydra. William Herschel discovered the nebula on February 7, 1785, and cataloged it as H IV.27. John Herschel observed it from the Cape of Good Hope, South Africa, in the 1830s, and numbered it as h 3248, and included it in the 1864 General Catalogue as GC 2102; this became NGC 3242 in J. L. E. Dreyer's ''New General Catalogue'' of 1888. This planetary nebula is most frequently called the ''Ghost of Jupiter'', or ''Jupiter's Ghost'' due to its similar size to the planet, but it is also sometimes referred to as the ''Eye Nebula''. The nebula measures around two light years long from end to end, and contains a central white dwarf with an apparent magnitude of eleven. The inner layers of the nebula were formed some 1,500 years ago. The two ends of the nebula are marked by FLIERs, lobes of fasting moving gas often tinted red in false-color pictures. NGC 3242 can easily be observed with amateur telescopes, and appears bluish-green to most observers. Larger telescopes can distinguish the outer halo as well.〔(【引用サイトリンク】 title=The Ghost of Jupiter )〕 ==Gallery== Image:Ngc3242.jpg|Imaged with a 10" Schmidt-Cassegrain telescope Image:Ngc3242a.jpg|A different Hubble image of the core region Image:Extended Region Around the Planetary Nebula NGC 3242.tif|Ultraviolet image from NASA's Galaxy Evolution Explorer Image:NGC3242.jpg|NGC 3242, 32 inch Schulman telescope on Mt. Lemmon, AZ 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 3242」の詳細全文を読む スポンサード リンク
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