2019-08-29, Spruce Knob, 4800 ft. Clear, relatively calm, humidity moderate. Transparency 10/10 to 6/10. SQM 21.6-21.7. 20" F/4. Abell 2, Cas. Immediately visible, bright. 8 mm with OIII. Slightly elongated NS, vaguely annular with a broader N side and weaker S side. [The nebula is blue, definite on DSS, somewhat annular.]