Caldwell 22, Blue Snowball nebula

by Willem Jan Drijfhout

Objects in field: Blue Snowball, NGC 7662, PK106-17.1

Equipment: Planewave CDK14, Moravian Instruments C3-61000 PRO

Integration: 23h 20m

This very tiny nebula is often photographed in RGB and if resolution is high enough, it can show some interesting details in the core. Also, surrounding the core is a rather faint, but quite large OIII envelope, making Caldwell 22 an even more interesting target. This image is an attempt to photograph both aspects of this nebula. Processing was very challenging, as the dynamic range between the…