NGC 7635 - The Bubble Nebula in Cassiopeia

Copyright 2002 John Hodge

The almost round 'bubble" in this photo is caused by fast stellar "wind" from a central star, known as BD+602522, impacting sparser areas of hydrogen gas and pushing them into a spherical shell.  The star's radiation then causes the shell to glow.  The bubble itself is about 10 light years in diameter and lies at a distance of 11,000 light years.  



Date/Location:    August 2002     Iwancio-Hodge Observatory    Bethune, SC
Instrument:    SBIG ST-7 through 12" LX-200 
Focal Ratio:   f 10
Guiding:    Auto via ST-7
Conditions:    Visually clear, but with moderate high level water vapor
Filters:    None