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NGC6888-The Crescent Nebula, 



NGC6888-The Crescent Nebula

Technical card

Resolution: 3035x1875

Dates:Aug. 5, 2013

AstroDon Tru-Balance H-Alpha 3nm: 15x1800" -20C bin 1x1
AstroDon Tru-Balance O-III 3 nm: 10x900" -20C bin 1x1
AstroDon Tru-Balance S-II 3nm: 10x900" -20C bin 1x1

Integration: 12.5 hours

Avg. Moon age: 28.24 days

Avg. Moon phase: 1.87% job: 88010

Locations: Home Observatory, Salem, Oregon, United States; Likely Place Golf and RV Resort, Likely, CA, United States


The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light years away. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 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.



License: None (All rights reserved)


NGC6888-The Crescent Nebula,