SDSS Ref. No. 587738067267813847

I know this doesn't look much like a galaxy (I in fact think it is a supernova remnant, although I don't really have a clue), but I thought it looked good enough to put up here. I'm sure I've seen it somewhere before, so if any one can offer some pointers, please post them up in the comments or e-mail me at f1zzle@hotmail.co.uk.

http://cas.sdss.org/astro/en/tools/explore/obj.asp?id=587738067267813847

UPDATE: Many thanks to robin_astro and s_hawkins who have informed me that this image is of planetary nebula PN G164.8+31.1 and is not a supernova remnant like I thought. Robin_astro has also pointed out that images on the SDSS website can be cross-referenced by clicking on the SIMBAD link to the side of the image.