NGC6888 - Crescent Nebula in Cygnus in O3 Pack, Francesco Di Cencio

NGC6888 - Crescent Nebula in Cygnus in O3 Pack

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Description

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away. It was discovered by Friedrich Wilhelm Herschel in 1792.[2] It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000[3] to 400,000[citation needed] years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

Cit. Wikipedia: http://en.wikipedia.org/wiki/Crescent_Nebula

A.A.P.O.D. 17/08/2014

Nuovo Orione Ottobre 2014

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NGC6888 - Crescent Nebula in Cygnus in O3 Pack, Francesco Di Cencio