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Image of the Week

Image of the Week, September 17, 2018

NGC 6888, The Crescent Nebula, Bi-Color HOO, by Nicolas Kizilian

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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

Gear used:
Orion Optics UK 8′ Newton (f4.5) with a Baader MPCC Mk III corrector
Moravian G2-8300
Guiding scope: William Optics ZenithStar 66 with a QHY5L-IIc
Mount: Skywatcher AZ-EQ6GT
Astrodon filters: Ha, OIII, 5nm

Sequence Generator Pro
Preprocessing: PixInsight
Processing: PixInsight, Photoshop CS6

About the photographer

Nicolas Kizilian
Location: France
Website, Astrobin, Instagram, Twitter, Facebook

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