NGC7635 (the Bubble Nebula) and the open cluster M52 in Cassiopeia.
The open cluster Czernik 43 is also visible, just below M52 on the left edge.
This image is a stack of 10 eight minute exposures shot through a Hydrogen-alpha filter one day before a full moon.
The exposures were acquired using an SXV-H9 CCD camera on a Tele Vue NP-101 4" f/5.4 refractor.
The exposures were calibrated, defect-corrected and stacked using AIP4WIN,
and an experimental sharpening filter was applied.
This image has been resampled down from its original size of 1392x1040.