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Robert Chozick | all galleries >> Galleries >> Deep Sky Images > Crescent Nebula - NGC 6888
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8-22-14 to 9-23-14

Crescent Nebula - NGC 6888

Fort Griffin State Historic Park and Plano, TX

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. (Wikipedia)

Astro Physics 155 EDFS f/7 w/ Prime Focus Flattener
SBIG STF-8300M CCD camera
Baader Vario Finder mounted as Guidescope
Starlight Xpress Lodestar Guider
Astro Physics 900 GTO mount

Astrodon Gen2 R/G/B (2x2 bin)- (10@ 5min each)
Astrodon 5nm Ha - 1x1 (10@20min each)
Hutech IDAS LPS - 1x1 (14@5min each)
Baader 7nm OIII - 1x1 (6@30min each)
RGB taken at Fort Griffin - all others taken in Plano, TX (backyard)

Guided with PHD
Captured and Stacked in Nebulosity 3
Processed in PS CS5 and PixInsight full exif

other sizes: small medium large original auto