Messier 101, also known as NGC 5457, Arp 26 and the “Pinwheel Galaxy”, is a galaxy with classification SAB(rs)cd in the constellation of Ursa Major. It has a diameter of ~200,000 light-years. The galaxy is designated both Messier 101 and Messier 102, though the galaxy NGC5866 in Draco is often designated as Messier 102.In the second image, the galaxy to the north-northwest is NGC 5422, the galaxy to the north-northeast is NGC 5485 and the galaxy to the south-southeast is NGC 5474 (Herschel 122). The images comprise 6 x Luminance (300 seconds each), 0.101m f/5.4 Tele Vue refractor with FLI ML16200 camera at an altitude of 60 degrees on 27 February 2017. 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 19 January 2019