The Bubble Nebula Revisited

NGC 7635 on June 25, 2004. My first SII Ha OIII image attempt.

2004-06-25:

The Bubble Nebula

NGC7635 on June 4, 2004. A combination of eight 20 minutes exposures through a 656.3/4.5 nm H-alpha filter for a total exposure time of more than 2.5 hours. The ST-7XE camera was cooled to -20C.