Bubble Nebula Region- Cropped Version

Bubble widefield
All Images Copyright Steve Cannistra

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Size: T
he FOV shown here is approximately 3.9 x 3.9 degrees, at an image scale of 3.5"/pixel
RA (J2000): 23h 17m 00s
Dec (J2000): +61 degrees 00' 00"

The Bubble Nebula (NGC 7635) is one of only a few "bubbles" identified in the night sky, and it forms a photogenic partner with the open cluster M52 and surrounding nebulae such as Sh2-157, Sh2-161 and NGC 7538.  It is an unusual planetary nebula named for the surrounding bubble that is seen in the upper right portion of the photograph above, caused by gas ejected from a massive central star.  The rate of ejected gas is so brisk that it "runs into" the wall of the surrounding nebula, thus creating a boundary of higher density gas that forms the outer shell of the bubble.  More information about this process may be found here.  Additional information about the Bubble Nebula can be found on Rob Gendler's website.

Photographic Details:
Dates:  August 17, 23, and 24, 2012
Scope:  Takahashi FSQ106 at f5 on the Takahashi NJP Mount
Autoguider:  SBIG ST-402 with 60mm guidescope, focal length 227mm
Camera:  Apogee U16M at -20C, with 7 position 50mm square filter wheel (Apogee FW50-7S)
Baader Ha narrowband filter; Baader RGB filters
Exposures:  Ha, 4 hours; R, 3 hours; G, 2 hours; B, 3 hours, all unbinned.  Total exposure 12 hours.
Post-processing:  Calibrated, aligned and stacked in Maxim, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS5

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