Michael P. Caligiuri of Carlsbad, California

CTB 1 (Abell 85) is a faint supernova remnant in Cassiopeia, about 9,800 light-years distant. Originally classified by George Abell as a planetary nebula, it is more than half a degree across, larger in apparent size than a full Moon. This Hα/OIII/RGB image was taken with a 4.2-inch refractor at f/5 and 8.25 hours of exposure.