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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.