NGC 6888 The Crescent Nebula

 

Explanation: The Crescent Nebula (also known as NGC 6888) is an emission nebula in the constellation Cygnus, about 5000 light years away. It was discovered by Friedrich Wilhelm Herschel in 1792.
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 to 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.

 

Telescope: 14.5 RCOS, Paramount ME2, Camera: SBIG 16803

Location: DGRO, Animas, New Mexico

Exposure: HA 360 min,O3 600 min,Red 1x1  255 min,Green 1x1 165 min,Blue 1x1 210min