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We report the discovery of a new dwarf galaxy, Andromeda XXIX, using datafrom the recently-released Sloan Digital Sky Survey DR8, and confirmed byGemini North telescope Multi-Object Spectrograph imaging data. And XXIX appearsto be a dwarf spheroidal galaxy, separated on the sky by a little more than 15degrees from M31, with a distance inferred from the tip of the red giant branchof 730kpc+/-75kpc, corresponding to a three dimensional separation from M31 ofbetween 205kpc and 227kpc (close to M31's virial radius). Its absolutemagnitude, as determined by comparison to the red giant branch luminosityfunction of the Draco dwarf spheroidal, is M_V = -8.3+/-0.4. And XXIX's stellarpopulations appear very similar to Draco's; consequently, we estimate ametallicity for And XXIX of [Fe/H]\sim-1.8. The half-light radius of And XXIXis 360pc+/-60pc and its ellipticity is 0.35+/-0.06, typical of dwarf satellitesof the Milky Way and M31 at this absolute magnitude range.

Andromeda XXIX: A New Dwarf Spheroidal Galaxy 200kpc from Andromeda