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We report the discovery of a new dwarf spheroidal galaxy near M31 based onINT/WFC imaging. The system, Andromeda XVII (And XVII), is located at aprojected radius of ~44 kpc from M31 and has a line-of-sight distance of794+/-40 kpc measured using the tip of the red giant branch, and therefore lieswell within the halo of M31. The colour of the red giant branch implies ametallicity of [Fe/H]~-1.9 and we find an absolute magnitude of M_v~ -8.5.Three globular clusters lie near the main body of And XVII, suggesting apossible association; if any of these are confirmed, it would make And XVIIexceptionally unusual amongst the faint dSph population. The projected positionon the sky of And XVII strengthens an intriguing alignment apparent in thesatellite system of M31, although with a caveat about biases stemming from thecurrent area surveyed to significant depth.

Andromeda XVII: A New Low Luminosity Satellite of M31