NGC 7635, also called the Bubble Nebula. It is a H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The "bubble" is created by the stellar wind from a massive young central star in its core.
Remotely imaged in narrowband HA/OIII/SII on a 17" Astrograph.......Mayhill New Mexico