Graem Lourens © 2017
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NGC6888 Crescent Nebula

The Crescent Nebula is the result of the collision and consists of a shell and two shock waves, one moving inward and one moving outward.

Distance to earth: 5’000 lightyears
Apparent size: 15 arcminutes (0.5 x the moon)

Imaging time: 15 hours

Telescope: SW Evostar 80ED
Camera: Atik 460EX Mono

Capture information:
Date: June – July 2016
Total exposure time: 15 hours
Color combination: HA=Red, OIII=Green/Blue

Image data:
25 x 1200s HA
20 x 1200s OIII