The Bubble Nebula

The Bubble Nebula (NGC 7635) is an HII region in the constellation Cassiopeia. Its iconic “bubble” shape was created from the stellar wind created by the intensely hot central star (SAO 20575). Also designated Sharpless 162, and Caldwell 11, this unmistakable emission nebula sits within a giant, glowing molecular cloud. The Bubble itself is about 10 light-years in diameter. Imaging Telescope: Vixen ED81s f/7.7 Mount: Skywatcher HEQ5 Synscan Pro (belt mod) Camera: QHY 533M Filter Wheel: QHY CFW3S-SR Guiding camera: ZWO ASI120MM Mini (mono) Guidescope: SkyWatcher EvoGuide 50ED Constellation: Cassiopeia Date: 17-18 Aug 2024 Location: Albireo Observatory 2, Ileia, Greece Sky brightness: B2 Exposure Time: L: 50x300 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1 R: 30x120 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1 G: 30x120 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1 B: 30x120 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1 Ha: 20x900 sec (gain: 56.00, offset: 12.00) 0°C bin 1×1 Acquisition: N.I.N.A v3 Processing: Pixinsight, Photoshop