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 250,000to 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.
[Description from wikipedia]
Ha: 20 x 30m (5nm)
OIII: 16 x 30m (3nm)
total exposure time: 18 hours.
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Celestron Edge HD 8" (FL: 2032mm)
Adaptive Optics Unit: SXV-AO-LF
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6