Abell 31 (PK 219 + 31.1 or Sharpless 290) is one of the largest observable planetary nebulae, located in the constellation Cancer. The visible diameter is about 970", which almost corresponds to the diameter of the famous Helix Nebula (NGC 7293).
L-channel - 26 x 300 sec. bin 1x1;
R-channel - 10 x 600 sec. bin 1x1;
G-channel - 10 x 600 sec. bin 1x1;
B-channel - 10 x 600 sec. bin 1x1;
Ha- 30 x 900 sec. bin 2x2;
OIII- 26 x 900 sec. bin 2x2.
Total integration time - 21:10 hours.
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