M 40By astrored / November 6, 2023 M39 . . Index . . M41 Messier 40 M 40 Double Star in Ursa Major. Winnecke 4 RA=12 22.4, Dec=+58 05. 8.4 mag, dist=0.51 kly. M40 page; DSSM page Hartmut Frommert ([email protected]) Christine Kronberg ([email protected]) Last Modification: 7 Apr 1998, 22:14 MET