D1005+68: A New Faint Dwarf Galaxy in the M81 Group
Adam Smercina et al 2017 ApJL 843 L6
New observations with the Subaru Hyper Suprime-Cam identify a new dwarf galaxy that may be a satellite of BK5N, which is in turn a satellite of M81. This may be one of the first detected satellites-of-a-satellite.