Wide crescent
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Wide crescent
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 from Earth. It was discovered by William Herschel in 1792. 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 250,000 to 400,000[citation needed] 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.
It is a rather faint object located about 2 degrees SW of Sadr.
1u40m HA
1u40m O3
1u40m S2
It is a rather faint object located about 2 degrees SW of Sadr.
1u40m HA
1u40m O3
1u40m S2
SPECIFICATIONS
Telescope
SPA-3
Camera
FLI PL16083
Location
IC Astronomy Observatory, Spain
Date of observation
Multiple One Click observations
Filters
O3 3nm, S2 3nm, HA 3nm Astrodon
Processing
DSS,SIRIL,GIMP,AFFINITY,STARNETT
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