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Eskimo Nebula
The Eskimo Nebula (NGC 2392), also known as the Clownface Nebula〔(Windows to the Universe )〕 or Caldwell 39, is a bipolar〔 double-shell planetary nebula (PN). It was discovered by astronomer William Herschel in 1787. The formation resembles a person's head surrounded by a parka hood. It is surrounded by gas that composed the outer layers of a Sun-like star. The visible inner filaments are ejected by a strong wind of particles from the central star. The outer disk contains unusual light-year-long filaments.
NGC 2392 lies more than 2,870 light-years away and is visible with a small telescope (but more preferably with a larger telescope) in the constellation of Gemini.
==Historic data==
The nebula was discovered by William Herschel on January 17, 1787, in Slough, England. He described it as "A star 9th magnitude with a pretty bright middle, nebulosity equally dispersed all around. A very remarkable phenomenon."〔''The Scientific Papers of Sir William Herschel'' by J. L. E. Dreyer, Royal Society, London 1912〕 NGC 2392 WH IV-45 is included in the Astronomical League's Herschel 400 observing program.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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