Messier 81, also known as NGC 3031, is agalaxy of type Sab in the constellation of UrsaMajor. It has a diameter of ~60,000 light-years. In the top image, the galaxy to the north is Messier 82and the galaxy to the east-northeast is NGC 3077. In the bottom image, the faintgalaxy to the east is PGC 28757.The top and bottom images comprise 6 x Luminance (300 seconds each), 0.101m f/5.4 Tele Vue refractor with FLI ML16200 camera at an altitude of 45 degrees on 29 December 2016. The fields of view of the top and bottom images are 132’ x 132’ (2.2 degrees square) and 42’ x 42’, respectively.
Hills Observatory: 1 January 2013 to 15 September 2019