Date Posted: 5/14/2025
Date Taken: Four nights, from 8/27 thru 10/17/2014
Scope: Planewave CDK 12.5 f/8, 2541mm
Camera: SBIG STL-11000 with Astrodon Tru-Balance E-Series Gen2 filters
Temp: -15C
Mount: Losmandy Titan
Guiding: SSAG, Celestron 80mm guide scope, 600mm.
Exposure: LRGB 140:75:60:75 Luminance 5min unbinned, RGB 5 min, binned 2x2

Calibrated and Stacked with CCDStack2; RGB combine and DDP with MaximDL. Processed with CS4.

NGC 7635 is the famous Bubble Nebula, also cataloged as Sharpless 162 and Caldwell 11. It is a bright H II region located between 7,000 and 11,000 light years away in Cassiopeia. The bubble itself is created by stellar winds from a massive hot young star 45 times more massive than our sun, located above and right of center in this image. The larger star with diffraction spikes below center is a much closer foreground star. The bubble itself is about 7 light years across, over 1 1/2 times the distance to our nearest star, and is surrounded by a much larger cloud of molecular hydrogen gas.

This is a re-process of an image taken in 2014.