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NGC6888
Wikipedia Reference: 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.
Exposure: 5.7 hours (138x150 seconds over 3 days)
Processed for bias, darks, flats, and a light amount of Photoshop, XGradient, Astronomy Tools
Mount: HEQ5 Pro
Telescope: Orion Mak 150mm
Imaging: QHY8L + LPS IDAS
Sensor temp: -15c
Location: Portland Downtown (Bortle 8)
Enjoy it!
M.
Albums: Emission Nebulae
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Comment by M.C. on October 1, 2011 at 12:06am
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Thanks a lot! I have the feeling that I would have to triple the time (i.e. 15 hours) to pull more Ha detail from a light polluted location with a OSC camera, but I'm happy with the result so far. Thanks again! It's encouraging to get good feedback.
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Comment by spike77 on September 30, 2011 at 10:54pm
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very nice
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