Necklace Nebula
The Necklace Nebula is a 19-trillion-kilometre-wide planetary nebula located about 15,000 light-years away in the northern constellation Sagitta. It was discovered in 2005 from the Isaac Newton Telescope Photometric H-alpha Survey, a ground-based... Wikipedia
Magnitude: 10.6
Radius: 4.4 ly (1.35 pc) pc
Apparent magnitude (V): 10.6
Constellation: Sagitta
Designations: IRAS 19417+1701, IPHASXJ194359.5+170901, PN G054.2-03.4
Distance: 15.0 ± 3.6 kly (4.6 ± 1.1 kpc) pc