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The Details
NGC 7635 Bubble Nebula in Cassiopeia
Astro-Physics 160 EDF Refractor at f/7.7
Astro-Physics 1200 GTO
Tru-Balance 5nm H-alpha; 3nm OIII and SII filters
14/15/20 August 2010
Mount Wilson Observatory - Mount Wilson, CA
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
Maxim DL/CCD, CCDStack, Photoshop CS5
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

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.




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