Abell 39
This nebula has the rare property of being extremely round and limb-brightened, exactly as the perfect, simple, theoretical planetary nebula ought to. A high resolution version of this nebula was taken at the WIYN 3.5-m telescope.
Shape: spherical like a bubble
Distance: approx. 7,000 light years
Location: Hercules constellation
RA: 00 28 20.00 DEC: -11 23 24.0
Size: 6 light years across
Abudances/Description: It contains about half the amount of oxygen as the Sun. The central star is slightly off center but the cause of this shift is unknown.
Discoverer: George Abell - (1966)