NGC 7635, also called the Bubble Nebula, 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, magnitude 8.7 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 Friedrich Wilhelm Herschel. The star SAO 20575 or BD+602522 is thought to have a mass of 10-40 Solar masses.
Members have successfully imaged Caldwell 11 through severe light pollution (Greater London) using 8″ telescopes.
Imaged by Simon Dawes
Canon 600D (Full Spectrum Mod) + CLSCCD Filter
27m Exposure from Bexleyheath, England.
Imaged by Keith Rickard
SBIG ST7-XME CCD camera, 8″ Meade LX200 Schmidt Cassegrain Classic at F6.3
30 x 30sec images in red, green, blue and luminance
Sky Watcher Mak-Newt 190mm, Canon modified 40D, ISO 800, 73 X 3min subs total 3hrs 39min
PHD guiding with QHY5 15\11\2010, EQ6 Imaged by Julian Tworek