Supernova 2004 et
The image above was taken at 6:10 UT on October 13, 2004. The Kopernik 20-inch was focal reduce to F/5. The image below (without the supernova) was taken at F/8 and thus has more detail, but a smaller field of view.
Spiral Galaxy NGC 6946:
Quote from the Deep Sky Field Guide to Uranometria 2000:
"Extremely small, bright nucleus, three or four main massive arms with much branching, low surface brightness (14.2). Emission patch 4.1 arc minutes NE of nucleus."
Discovered by William Herschel in 1798, NGC 6946 is a face-on spiral galaxy in that has an H II region nucleus and several massive and branching spiral arms. It is among the closest galaxies to the Local Group, being about 4 times further than M-31, the Andromeda Galaxy. It has had eight recorded supernovae, the most of any galaxy. There are also a total of 27 additional known supernova remnants in this system. The Hubble Space Telescope has observed two of these supernova remnants colliding with each other!
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George Normandin, KAS
October 15th, 2004