Investigation of spectra from the Sloan Digital Sky Survey reveals the presence of a region of ionized gas of > 2 \arcdeg diameter centered approximately at \alpha = 10 ^ { h } 37 ^ { m } \delta = -00 \arcdeg 18 ^ { \prime } ( J2000 ) ( Galactic coordinates l = 248 ,b = +48 ) .
[ O iii ] 4959,5007 emission is particularly strong and emission from H \alpha and [ N ii ] 6548,6583 is also detectable over a substantial area on the sky .
The combination of emission line ratios , the close to zero heliocentric radial velocity and the morphology of the structure are consistent with an identification as a very nearby planetary nebula .
The proximity of the hot , DO white dwarf PG 1034+001 further strengthens this interpretation .
The object is : i ) the largest planetary nebula on the sky , ii ) certainly closer than any planetary nebula other than Sh 2–216 , iii ) the first to be unambiguously associated with a DO white dwarf .
A parallax distance for PG 1034+001 would establish whether the structure is in fact the closest , and one of the physically largest , planetary nebula known .