NGC 7635 Bubble Nebula

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The Details
Object	NGC 7635 Bubble Nebula in Cassiopeia
Optics	Astro-Physics 160 EDF Refractor at f/7.7
Platform	Astro-Physics 1200 GTO
Camera	SBIG ST-10XME
Filters	Tru-Balance 5nm H-alpha; 3nm OIII and SII filters
Date	14/15/20 August 2010
Location	Mount Wilson Observatory - Mount Wilson, CA
Exposure	Ha 31 x 1200 sec 1x1 bin; OIII and SII 12 x 1200 sec 1 x 1 bin each Ha 10h20m; OIII 4 hours: SII 4 hours - Total exposure time 18h20m
Software	Maxim DL/CCD, CCDStack, Photoshop CS5
Orientation	Field of View: 40’20" x 27’10" centered on RA 23h20m57s DEC +61°12’18” (2000.0). North angle 92.9°; east 90° CCW from north
Notes	The Bubble Nebula, NGC 7635, marks the boundary between material propelled outward by intense stellar winds from a hot, massive star buried within the bubble meeting the denser and cooler gas of the surrounding nebula. The stellar wind, with a velocity of about 4 million miles per hour, has formed this 6 light year diameter structure we know as the Bubble Nebula, which lies abut 7100 light years from Earth. This representative narrowband color image, processed in the Hubble palette, which assigns the SII channel to red, the H-alpha channel to green, and the OIII channel to blue, was NASA's Astronomy Picture of the Day on 02 September 2010.