NGC 7635 Bubble Nebula Redo
Copyright 2014
Larry Phillips
NGC 7635, Bubble Nebula in the constellation Cassiopeia was created by the stellar wind from a massive hot young central star, the SAO 20575. 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.

Distance: 11,000 light years
Size: 10 light years across
Camera: SBIG ST-10XME
Telescope: Astrophysics Starfire 140 EDT F7.5
Mount: Astro-Physics Mach1 GTO with Advanced Telescope Systems portable pier
Images: This is an HaRGB image with 284 subexposures of varying minutes each with 58@15 min. of Ha, 73@5min. & 3@10 min. of red, 70@ 10 min. & 6@ 10 min. of green, and 69@5 min. & 6@ 10 min. of blue for a total time of 22 hours & 45 minutes. I used the Tony Hallas method for adding the Ha w/o luminance data.
Date: Oct 2013
Software: Camera, mount, and guider control - CCD Commander & MaximDL; calibration, stacking, & color creation in CCDStack, and further processing in Photoshop CS6.