Abell 61

I imaged this small planetary nebula, also known as PNG 077.6+14.7, in early April. Processing took several days and versions before I was happy enough.

Abell 61 is about 3.4' in diameter and mostly round. It's located in constellation Cygnus. Abell (1966) described it as "incomplete rings with gaps". The central (mag 17) variable star is WD1917+461. Its distance is unknown.

And here's 100% crop of the nebula.

Exposure details:
                             Ha            5 * 1800"
                            OIII           7 * 1800"
                             TOTAL    6h

Full size again in Astrobin