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We have measured the proper motion of the Local Group galaxy IC 10 with theVery Long Baseline Array by measuring the position of an H2O maser relative totwo background quasars over 4.3 years. After correction for the rotation of theMilky Way and IC 10, we obtain a motion of -39 +/- 9 microas/yr toward the Eastand 31 +/- 8 microas/yr toward the North. This corresponds to a total spacevelocity of 215 +/- 42 km/s relative to the Milky Way for an assumed distanceof 660 +/- 66 kpc. Assuming that IC 10 and M33, for which also a proper motionmeasurement exists, are bound to M31, we calculate a lower limit for the massof M31 of 7.5 x 10^11 Msol.

The proper motion of the Local Group galaxy IC 10