Object: NGC6888 Crescent Nebula

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Object 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
Equipment H-Alpha Version: Willian Optics FLT-110 f/6.5 (FL 715mm) AP-600E GTO Mount

Color Version:Orion Atlas Mount, EQMOD, Astro-Tech 111 f/7, 80mm guidescope Orion SS Autoguider
Camera H-Alpha Version SBIG ST2000XM, SBIG Filterwheel w/Astronomik Type @c filters

Color Version: CCD-Labs Q453HR
Pixel size:

Square 7.8um x 7.8um
Image format:

3032(h) x 2016(v) ~ 6.11M pixels
Image Area:

23.4mm(h) x 15.6mm(v) APS film equivalent

Exposure  H-alpha 8x20min

Color Version 7x15min
Processing Captured with Maxim DL, Aligned and Stacked in CCD STACK  Finished with  Photoshop 7

Color Version, Captured with Maxim DL, Aligned and Stacked in DeepSky Stacker, Background & color Adjustments in CCDStack, Finished with Photoshop CS5 using AStronomy tools 6.1
Date/Time H-Alpha 05\24\2006 Mount Pinos, Ca,     Color 07\01\2011 Mount Pinos, Ca