Magao Observations Of The Binary Microlens Ogle-2014-Blg-1050 Prefer The Higher-Mass Solution

We report adaptive optics (AO) follow-up imaging of OGLE-2014-BLG-1050, which is the second binary microlensing event with space-based parallax measurements. The degeneracy in microlens parallax pi(E) led to two sets of solutions, either a similar to (0.9, 0.35)M-circle dot binary at similar to 3.5 kpc or a similar to(0.2, 0.07)M-circle dot binary at similar to 1.1 kpc. We measure the flux blended with the microlensed source by conducting Magellan AO observations, and find that the blending is consistent with the predicted lens flux from the higher-mass solution. From the combination of the AO flux measurement together with previous lensing constraints, it is estimated that the lens system consists of a 1.05(-0.07)(+0.08) M-circle dot primary and a 0.38(-0.06)(+0.07) M-circle dot secondary at 3.43(-0.21)(+0.19) kpc.