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Bubble Nebula & M52
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NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia.  The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star. 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 SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.


3 x SII + 3 x Ha + 3 x OIII.
Total = 9x900 seconds: 2 hrs 15Mins.

Tak FS106ED on Tak EM200 Mount. ATIK 460EX camera.