https://www.tdo.space/2017/10/09/ngc-7635-bubble-nebula/
NGC 7635 (Bubble Nebula)
The Bubble Nebula (NGC 7635) is an emission nebula in Cassiopeia. It is about 10 light years across and lie about 8000 light years distant. It was formed from a Wolf-Rayet star who’s stellar wind created the bubble shape.
The image above was captured using a 7nm Hydrogen-Alpha filter. The red is false color created from Carboni’s tools in Photoshop. The image details are below.
Object: NGC 7635 (Bubble Nebula)
Constellation: Cassiopeia
Telescope: ES127mm F7.5 APO Refractor
Mount: Paramount MX+
Camera: ATIK One 6.0
Filters: Orion 7nm Ha
Guide Scope: OAG
Guide Camera: SBIG STi
Total Integration: 3.5 hrs.
Image Capture: SkyX camera addon
Guiding: SkyX
Stacking/calibration: DSS/SkyX
Post Processing:Photoshop CS5