NGC 6888, The Crescent Nebula, Bi-Color HOO, by Nicolas Kizilian
Here is my latest image, and the first one I made with a Newton.
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 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. (Source: Wikipedia)
Total exposure 7h06
Ha : 33 x 300s
OIII :26 x 600s
Orion Optics UK 8′ Newton (f4.5) with a Baader MPCC Mk III corrector
Guiding scope: William Optics ZenithStar 66 with a QHY5L-IIc
Mount: Skywatcher AZ-EQ6GT
Astrodon filters: Ha, OIII, 5nm
Sequence Generator Pro
Processing: PixInsight, Photoshop CS6
About the photographer
Want in on the action? Submit your image today!