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Crescent Nebula (NGC6888)

Taken by: Tony Cellini
Date: 6/9/2010
Exposure: 60 minutes (12 X 300 seconds)

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)

Astro-Tech AT106LE, 106mm f/6.5 triplet
Astro-Tech Field Flattener
SBIG ST8300M w/FW5-8300
Baader 7nm Hydrogen Alpha
Guided w/ Oriion ST80 & Starshoot Autoguider
Celestron CGE Mount
Lights: 12 X 5min exposures @ -5C
50 Darks
No Flats
Stacked in Deep Sky Stacker
Processed with Photoshop CS5