M 108By astrored / November 6, 2023 M107 . . Index . . M109 Messier 108 M 108 (NGC 3556) Spiral Galaxy in Ursa Major. RA=11 11.5, Dec=+55 40. 10.0 mag, dist=45000 kly. M108 page; DSSM page Hartmut Frommert ([email protected]) Christine Kronberg ([email protected]) Last Modification: 7 Apr 1998, 22:15 MET