NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a 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, the 15 ± 5 M☉ 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 SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.
Imaging telescopes or lenses: The Liverpool Telescope
Imaging cameras: IO:O
Software: Photoshop, DeepSkyStacker
Filters: H-Alpha-6566, SDSS-R, Bessell-V
Resolution: 1646×1637
Dates: Sept. 24, 2014
Frames: 45×120″
Integration: 1.5 hours
Avg. Moon age: 29.28 days
Avg. Moon phase: 0.07%
RA center: 350.193 degrees
DEC center: 61.181 degrees
Pixel scale: 0.379 arcsec/pixel
Orientation: -179.949 degrees
Field radius: 0.122 degrees
Locations: Roque de los Muchachos Observatory, Santa Cruz de Tenerife, Spain
Author: Matthew
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