| 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 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 400,000 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. (source wikipedia)
The accompanying H-Alpha image is a stack of six seperate ten minute integrations made in Beilen, June 28 2011. The CCD camera was cooled to -15°C and mounted on a 40cm telescope with 1600mm focal length, the image scale is 1.4 arcsecond/pixel.