The Crescent Nebula- (NGC6888)

The Crescent Nebula is a famous emission nebula located in the constellation of Cygnus in the Milky Way region. It is about 5,000 light-years from Earth.
It contains hydrogen atoms (shade of red) and the shade of blue is made up of oxygen atoms that surround hydrogen. The diameter of this amazing gas bubble is about 25 light-years.
The central star of the object (Wolf-Rayet WR 136) is part of a group of very large massive stars, extremely hot. In the future, it could result in a spectacular supernova explosion.

Telescope ASA 10″ F/3.6 10N ASTROGRAPH OTA
Focal length 900 mm
Mount G53f
Imaging camera Atik 460EX mono
Guiding cameras Lodestar X2 -Autoguider
Guiding optics ASA 10″- OAG
Focal reducers ASA 3″ Wynne Corrector 0,85x
Constellations Cygnus
Distance 5000 light years
RA center 20h 12′ 06″
DEC center +38°21′ 22″
Location taken Slovakia
Date taken 10/2017
Pixel scale 1.04 arcsec/pixel
Filters Astronomik Ha 6nm ,
Astrodon OIII 5nm,
Astrodon RGB (star)
Exposure 59 x 1200 sec.BIN1 Ha filter
73 x 1200sec.BIN1 OIII filter
21 x 300sec.BIN2  RGB filter (each)
Total exposure 49 hours
Processing software PixInsight, CCD Inspector

Processing object The Crescent Nebula was captured using narrowband filters a Hydrogen-alpha H-α 6nm (656.3 nm), Oxygen OIII 5nm(500.7 nm), the stars were captured by RGB filters.
Here you see a few hours of individual images (Ha,OIII). Photos are only gently stretched (CurvesTransformation).

It is interesting to see these individual images without stars (Ha,OIII).You can see the RGB for comparison too. You can see the completion (Ha, OII, RGB) above.