2019-09-03, Spruce Knob, 4800 ft a.s.l. Clear, relatively dry and calm. Transparency above average, seeing 3-4 arcsec. SQM 21.7. 20" F/4. Abell 84 (PN, Cas). Appears similar in 13 and 5.5 mm with OIII. Two star pairs to the W and NW. Star embedded on the E edge. That edge appears enhanced as a thin arc passing through the star. Opposite edge enhanced too but connected with the center, appearing as a very thick annular segment. [The nebula is prominent on Panstarrs g and has traces of the structure seen visually, but the edge passing through the bright star is enhanced more by subthreshold stars.]