Lying at D∼ 3.6 Mpc, the M81 Group is one of the nearest galaxy groups and it has been intensely studied for several decades. We have used HSC on Subaru to carry out a deep photometric survey of resolved stars over 10 sq. degrees in the M81 Group, with the aim of better understanding this environment and the group interaction history. These data have uncovered a giant tidal stream emanating from F8D1, a low luminosity satellite of M81 and the nearest bona fide example of an ultra-diffuse galaxy. With our existing data, we can trace this feature over 60 kpc to the northeast but have no coverage to the southwest meaning our view of this intriguing system is highly incomplete. We request 5h to obtain a pointing on the other side of F8D1 to enable us to [1] characterise the full extent and morphology of the tidal disruption feature, [2] calculate the total luminosity and stellar mass in the extra-tidal stars [3] search for line-of-sight distance and metallicity variations along the southern tail and [4] search for associated globular star clusters. The data will be used to better understand the role of F8D1 in the interaction history of the M81 Group and will also shed light on the nature of ultra-diffuse galaxies. This proposal was accepted in 22A but no queue data were obtained.
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