The Bubble nebula (NGC 7635) and open cluster M52 in Cassiopeia. They appear next to each other but the nebula is ~11000 LY away while M52 is closer at a distance of only ~5000 LY. About 3 hours of total exposure (35x5m). Optolong LeXtreme filter with ASI533MC-pro on WO ZS61.
#astro
