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 that was discovered by William Herschel in 1792. NGC 6888 is formed by the fast stellar wind from the Wolf-Ravet 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.

Image Capture Details:

9x1800s each Ha and OIII. Processed in HOO.
Telescope - PlaneWave 12.5" CDK
Mount - iOptron CEM120EC2
Camera - ZWO ASI2600MM
RA 20hrs 12' 06"
DEC +38degrees 21' 17"
Position Angle (CCW) - 90 degrees
Guide Star - TYC3151-3315-1 / mag 9.24
Location - Calgary Alberta
Date - July 2022
Constellation - Cassiopeia
Distance - 5,000 lightyears

Processed in ImagesPlus, PixInsight and PhotoShop