Discovered: December 9th, 1999, by amateur astronomer Reiki Kushida of Japan. This is her 8th supernova discovery.
Follow this Link to a NASA Web site on supernovas. It has a very nice animation and a description of what these objects are.
Spiral Galaxy NGC 3184:
Quote from the Deep Sky Field Guide to Uranometria 2000:
Small, very bright nucleus; two main knotty arms.
This grand face-on spiral galaxy is about one degree east of the 3rd magnitude star Mu Ursae Majoris. The bright star embedded in the outer parts is about 11th magnitude. Because of errors in the New General Catalog(NGC), this galaxy is also NGC 3180, and is probably the missing objects NGC 3181 and 3182.
Click below to
George Normandin, KAS
May 3rd, 1998,
revised April 4th, 2000