SIMBAD references

We have measured the proper motion of the Local Group galaxy IC10 with the Very Long Baseline Array by measuring the position of an H₂O maser relative to two background quasars over 4.3 years. After correction for the rotation of the Milky Way and IC10, we obtain a motion of -39±9µas/yr toward the East and 31±8µas/yr toward the North. This corresponds to a total space velocity of 215 ±42km/s relative to the Milky Way for an assumed distance of 660±66kpc. Assuming that IC10 and M33, for which also a proper motion measurement exists, are bound to M31, we calculate a lower limit for the mass of M31 of 7.5x10¹¹M_☉.