The Bubble Nebula (NGC 7635)

All Images Copyright Steve Cannistra

Magnitude:  ??
Size: about 10 light years across (the Bubble itself)
Distance: ?? about 3000-5000 light years
RA: 23h 20m 42s
Dec: 61 degrees 12' 00"

The Bubble Nebula is one of only a few "bubbles" identified in the night sky.  It is an unusual planetary nebula named for the surrounding bluish bubble that is seen in the center 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.  This creates the boundary between the bluish edge of the bubble, and the reddish surrounding glow of the nebula, which is also seen in this view from the Astronomy Picture of the Day.

Photographic Details:

Date:  July 30, 2003
Scope:  LX90 at f5, Lumicon OAG
Autoguider:  SBIG STV with e-finder
Camera:  Canon 10D
Filter:  IDAS LPS
Exposures:  4 x 10' each at ISO800
Conditions:  Temperature 75 degress F; average transparency; average to poor seeing; wind moderate.
Post-processing:  Raw conversion, adaptive dark frame subtraction, averaging, and background compensation done in ImagesPlus; alignment done in Registar; levels and curves adjustment in Photoshop, with selective noise reduction of the red channel done in Pleiades SGBNR software.

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