7635 Bubble Nebula in Cassiopeia
10" f/8 RC on Asto-Physics 1200GTO; SBIG ST-10XME, Astrodon
filters; Astro-Physics 80X900 guidescope.
RGB - 8 to 10 x 180s; Luminance - 10 x 180s; Hydrogen alpha as
luminance 3x300s; Expose/process in Maxim / Photoshop.
08-09 October 2010; Chiefland Astronomy Village
7635, also called the Bubble Nebula and Sharpless 162, 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 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. (Entry abstracted
from Wikipedia website)