M 101By astrored / November 6, 2023 M100 . . Index . . M102 Messier 101 M 101 (NGC 5457) Spiral Galaxy in Ursa Major. Pinwheel Galaxy RA=14 03.2, Dec=+54 21. 7.9 mag, dist=27000 kly. M101 page; DSSM page Hartmut Frommert ([email protected]) Christine Kronberg ([email protected]) Last Modification: 7 Apr 1998, 22:15 MET