NGC 7635 - The Bubble Nebula -  12.02.2008
Image Capture Details

Optics:  Meade LX200 14 @ F/2 with HyperStar
Mount: Meade
Camera: QHY8
Filters: LPS
Exposure:  96 X 60 Seconds= 96 Minutes
ISO 800
Time: 7:30PM - 9:50 PMEST
Location: Waldwick, NJ
© 2008 David A. Trapani
MetropolitanSkies.com
All Rights Reserved
Click image for
higher resolution
The Bubble Nebula is actually the smallest of three bubbles surrounding
massive star BD+602522, and part of gigantic bubble network S162
created with the help of other massive stars.  As fast moving gas
expands off BD+602522, it pushes surrounding sparse gas into a shell.  
The energetic starlight then ionizes the shell, causing it to glow.  The
Bubble Nebula is about 10 light-years across and visible with a small
telescope towards the constellation of Cassiopeia.

1  http://antwrp.gsfc.nasa.gov/apod/ap000118.html