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NGC 7635
Bubble Nebula
NGC 7635, the Bubble Nebula in Cassiopeia. The Bubble is approximately 11,000 light
years distant, and is approximately 10 light years in diameter. The stellar wind of the
massive Wolf-Rayet star BD+602522 is pushing the gas shell of the nebula outward, but
the outward movement is being resisted by the nearby dense molecular cloud. This
interaction causes the surrounding material to heat up and glow. This image was taken
using standard broadband red, green and blue color filters, and as a result has a more
normal color appearance than some images of this object taken using narrowband filters.

The image was taken over four nights using the new Montgomery Bell Academy
observatory on Long Mountain near McMinnville, TN.  The telescope was operated
remotely during data collection. The observatory is complete, although the systems that
will be used to vent air from the dome have not yet been activated, and seeing conditions
in the dome should be improved in the future as a result.  The FWHM of the final image is
approximately 2.5 arc seconds.  

August 23, 25, 26 & 27, 2011
Camera: SBIG STX16803
Filters:  AstroDon LRGB
Camera control software:  MaximDL
Guiding/adaptive optics: Self guided
Camera temperature:  -20C
Telescope:  PlaneWave CDK 24"
Telescope control software:  SiTech, PointXP, TheSky6
Mount:  PlaneWave Ascension 200HR
Total exposure time: 5 hours
Subexposures:
Luminance:  48 x 5 minute, binned 2x2 (0.89 arc sec per pixel)
RGB:  12 x 5 minute Red, Green & Blue, binned 2x2
Conditions: Hot, variable seeing.
Processing: CCDStack2 and Photoshop CS5.
Click above or here for 1500 x 1500