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We present the first example of binary microlensing for which the parametermeasurements can be verified (or contradicted) by future Doppler observations.This test is made possible by a confluence of two relatively unusualcircumstances. First, the binary lens is bright enough (I=15.6) to permitDoppler measurements. Second, we measure not only the usual 7 binary-lensparameters, but also the 'microlens parallax' (which yields the binary mass)and two components of the instantaneous orbital velocity. Thus we measure,effectively, 6 'Kepler+1' parameters (two instantaneous positions, twoinstantaneous velocities, the binary total mass, and the mass ratio). SinceDoppler observations of the brighter binary component determine 5 Keplerparameters (period, velocity amplitude, eccentricity, phase, and position ofperiapsis), while the same spectroscopy yields the mass of the primary, thecombined Doppler + microlensing observations would be overconstrained by 6 + (5+ 1) - (7 + 1) = 4 degrees of freedom. This makes possible an extremely strongtest of the microlensing solution. We also introduce a uniform microlensingnotation for single and binary lenses, we define conventions, summarize allknown microlensing degeneracies and extend a set of parameters to describe fullKeplerian motion of the binary lenses.

Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions