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

Processing

PixInsight,Fitswork, Photoshop

Notes

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.