NGC 6888 - The Crescent Nebula

NGC 6888

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Location / Date

Zellerndorf, Aug-Sept 2016

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Reducer Corrector (f2.8, focal length 715 mm)
ASA DDM60, no Guiding

Camera / Exposure

Canon EOS 500Da: 25 x 3min

FLI ML8300, FLI CFW-2-7 Filter Wheel with Astrodon filters:
Hα 12 x 10min
OIII 11 x 20min

Total exposure time: 6h 55min


PixInsight,Fitswork, Photoshop


The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light years away.
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.

Ju 1 (Jurasevich 1) or PN G75.5+1.7 is a very faint planetary nebula, also called the Soap Bubble Nebula. The nebula was discovered by the amateur Dave Jurasevich at the Mount Wilson Observatory in 2008.

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