| MB 3 | |
| Epoch: | J2000 |
| Type: | dSph |
| Ra: | 02h 55m 42.7s |
| Dec: | +58° 51' 37" |
| Dist Ly: | ~10 Mly (~ 3 Mpc)[1] |
| Appmag V: | 17.33 (V-band) |
| Group Cluster: | IC 342/Maffei |
| Size V: | ~ 1.9′ |
| Constellation Name: | Cassiopeia |
| Notes: | Companion of Dwingeloo 1 |
| Names: | 2MASX J02554290+5851394, KK98-021, PGC 166069 |
MB 3 is a dwarf spheroidal galaxy discovered in 1997 and located about 10 million light-years away from the Earth. It was discovered during an optical survey of the IC 342/Maffei group to which the galaxy is a member. MB3 is a companion galaxy of Dwingeloo 1 and situated in the Zone of Avoidance. MB 3 is thought to be a member of the IC 342/Maffei Group, a galaxy group adjacent to the Local Group.[1]
The visible diameter of MB 3 is approximately 1.9′, which at the distance of 3 Mpc corresponds to about 2 kpc. In optical images it appears as a highly flattened diffuse oval located approximately 9.2′ to the southwest of Dwingeloo 1. No neutral or molecular hydrogen has been detected in it, which is consistent with its classification as a dwarf spheroidal galaxy.