NGC-7635, commonly called The Bubble Nebula is an H II emission nebula located in the constellation of Cassiopiea, less than 1 degree from the open star cluster Messier 52. The "bubble" formation is created by the stellar wind from a massive, hot young star, SAO-20575. This bubble is contained within a giant molecular cloud, which is also excited by this star, causing it to glow in the wavelength of ionized hydrogen. NGC-7635 lies 11,000 light years from Earth. The bubble itself is 8 to 10 light years in diameter. NGC-7635 was discovered by Sir William Herschel in 1787.
This image, acquired on July 9, 2014, is a 1 hour integration of 6 minute exposures through the Celestron C-11 at f/2, using the HyperStar III imaging system and the Starlight Express SXVR-H694C color CCD camera, operating at -10 degrees below ambient temperature and binned 1 X 1. Guided, captured and combined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools and NoiseWare.