NGC-7635 is a hydrogen emission nebula located in the constellation of Cassiopeia. The brightest portion of the nebula contains a "bubble" created by the stellar wind from an intensely hot, massiveblue white star, SAO 20575, which is pushing against the hydrogen cloud, creating a bubble that is about 7 light years in diameter. This nebula lies at a distance of 7100 light years from Earth, and was discovered by Sir William Herschel in 1787.
This image is a 2 hour 34 minute integration of 2 minute exposures through the C-11 at f/6.3, using the Starizona Reducer/Corrector 6.3 and the ZWO ASI2600MC Pro camera operating at 10 degrees below ambient temperature and binned 1 X 1. Acquired, guided and captured using N.I.N.A (Nighttime Imaging 'N' Astronomy). Combined and color balanced using Maxim DL5. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Deep Sky Colors, Carboni's Astro Tools, and NoiseWare.