The Bubble Nebula - NGC 7635 in Cassiopeia

The Bubble is a H-II region, a bubble of hydrogen gas ionized by the UV radiation of a hot star inside it.

New:

Exposures: Exposures: 60 min each of red and green; 70 min blue (3.14 hours total) on Oct. 30-31, 2021.

Image size: 16.9'x22.5'; limiting magnitude: 19.0 mg.

Authors: M.Bishop, S.Pitts, K.Lawmaster, G.Harrison.