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SBIG ST-4K, 2700s total exposure 9/21/17 Whisper Canyon, CA

Emission nebula in Cassiopeia. The 'bubble' is thought to be created by stellar wind from a central star colliding with surrounding gas. Note also the red object near the central star. While it appears quite bright in photographs, I was not able to detect it visually.

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Starshoot DSCI, 27 exposures, 30s each 9/29/11 Lake San Antonio, CA

Emission nebula in Cassiopeia. The 'bubble' is supposed to be created by stellar wind from the central star colliding with surrounding gas. Note the much brighter object near the central star.