Bubble Nebula: NGC 7635

NGC 7635, commonly known as the Bubble Nebula and cataloged as Sh 2-162 and Caldwell 11, is an emission nebula in Cassiopeia. The prominent bubble is shaped by the stellar wind from the massive hot star SAO 20575, which pushes into the surrounding molecular cloud and ionized hydrogen region. The object lies near the open cluster Messier 52 and is generally placed at roughly 7,000 to 11,000 light years from Earth, depending on the distance estimate used for the surrounding complex. | Equipment: Celestron HD8, ZWO ASI6200MMP, Antlia Pro 3nm SHO, 4h 25m integration, 10/15/2025