Deep Sky
M109

NGC3992

Barred spiral galaxy
Constellation: Ursa Major
Another discovery by that busy guy, Pierre Mechain in 1781.  This galaxy is approx 83.5 million light-years away from earth. 
Between 1920 and 1950, it was considered that Messier really was involved in 103 objects, and the others listed were not official.  However, as time moved on, the additional listing such as M109 were , more widely accepted ( a what the hell, moment).  Now, 105-110 are now listed as addendum.  Since the 1970s all 110 are now commonly used by astronomers.
In 1956 a supernova was observed, and named SN1956A.  this is the
10 stacked
10 sec ea
Date: 03-12-13