Supernova in Galaxy M82

On January 21st a group of astronomy students spotted a supernova in M82, a nearby galaxy in Ursa Major. It continued to swell and seems to have peaked at visual magnitude 10.5 during the first week of February.
I have been trying to photograph this for weeks and have been frustrated by clouds and bad weather.
Last night I finally got a window of (relatively) clear sky between the rain clouds and shot off 20 x 20 second exposures which have been stacked to form the image below. 

The supernova is a superdense white dwarf, a star only about the size of Earth but with the gravitational power of a Sun-sized star which can no longer support itself and suddenly collapses, heats to incredible temperatures, and burns up explosively in a runaway fusion reaction. 

The light from that tiny white dot in the picture has taken 12,000,000 years to reach my telescope.