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☉.

Telescope: Astro Physics 155EDF f7
Mount: Astro Physics 1200GTO
Camera: SBIG STL-11000M
Guider: SBIG STL-Remote OAG

Ha: 21×20 mins = 420 mins, R: 20×10 mins = 200 mins, G: 20×10 mins = 200 mins, B: 20×10 mins = 200 mins

Total Imaging Time: 17h 00m

Data Imaged remotely over 7 nights during September & December 2007.
Data acquisition & Processing by David Churchill.

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