Abell 2197, a galaxy cluster in Hercules.
This image is a stack of 8 eight minute exposures
using an SXV-H9 CCD camera on a Vixen R200SS 8" f/4 Newtonian equipped with a Paracorr.
The exposures were calibrated, defect-corrected and stacked using AIP4WIN.
This image has been resampled down from its original size of 1392x1040.