Crescent and Soap Bubble Nebula

The Crescent Nebula, top right, (NGC 6888, Caldwell 27, Sh2-105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. 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.

The Soap Bubble Nebula (faint at the bottom left) is a planetary nebula in the constellation Cygnus. It was discovered by amateur astronomer Dave Jurasevich using a medium sized refractor in June of 2007.

Integration time: 33 hrs of 600s Ha/Oiii and 60s RGB exposures from my Bortle 4/5 backyard

Telescope: Skywatcher Esprit 120 ED APO

Imaging Camera: ZWO ASI 294MM

Guiding: Starfield 50mm guide scope with ZWO ASI290MM guide camera

Filter: Optolong Ha, Oiii and RGB

Mount: Skywatcher EQ6R-Pro

Calibration: Flats and flat darks

Hardware Control: ASIAIR Pro, Pegasus Power Box and ZWO EAF

Processing: The selected images were pre-processed and processed using Pixinsight.

As always constructive criticism is welcome and appreciated. I am always looking for ways to improve my image capture and processing skills. Thanks for looking.