Published
in Sky & Telescope
NGC 7635 the Bubble Nebula
NGC 7635 is a emission nebula located in the constellation of Cassiopeia. A closer look at the center of the nebula will show what looks like a bubble or tear-drop.
This image is a composite of two 90 minute exposures on hypered Kodak PJ 400. They were taken with the 12.5" f/7 Newtonian.