While this object is fairly common and bright, I found it challenging to process bringing out the detail I wanted. I had four layers to process differently from each other; the stars, background nebulosity, the bubble itself and the hot spot on the bubble. I originally captured it back in 2018 when I was new to astrophotography, but wanted to attempt it again to see how far I can push it:
https://www.astrobin.com/355553/ NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an 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 hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉.
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