Object: Planetary nebula ABELL 21 Constell: GEM RA: 07h 29m Decl: +13° 14.8' Epoch: 2000 Mag: 10.3m (v) ? Size: 10'x6' Type: 3 3 3 (Sharpless-type) Observer: Jere Kahanpää Obs. place: Hartola - Finland Date/Time: 25./26.2.1995, 22.50 Telescope: N 205/1000 Magn: 40x Filter: O-III Field: 83' NE Lim.mag: 5.8m Background sky: 2 Seeing: 3 Weather: -6 °C, no moon, some ice mist Brightness: 4 Alt: 40° Description: Huge (for a planetary)! Almost round with some ring structure. Barely visible without the O-III filter but bright with it (almost Br 3). Three clearly brighter parts: the SW brightening is biggest and easiest. The NW side is very diffuse.