NGC6888 - The Cresent Nebula

The final revision where the oxygen shield that covers the nebula is visible.

BI-Color, Ha for Red, OIII for green and blue

Bi-Color with RGB stars from an old DSLR image





Boren-SImon 8" F3.6

Imaging Camera

Starlight Xpress H9 Mono



Exposures :

37*600 Ha


20*600 OIII


5*1200 OIII




ASA 2" x 0,73 Corrector/Reducer 2KORRR


Astrodon H-alpha 6nm

Astrodon OIII 3nm


September. 2014

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 was discovered by Friedrich Wilhelm 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 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.(WIKI)