NGC 7635 or The Bubble Nebula is an emission nebula in the constellation of Cassiopeia.

The image is a 3-part mosaic of the surroundings of that nebula. The total exposure time is 18 hours with Astrodon 5 nm narrowband filters (H-alpha, S-II and O-III), Sky-Watcher Esprit 100ED and Atik 460EX CCD.