2021AJ....161..113X

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 π_E led to two sets of solutions, either a ∼ (0.9, 0.35)M_☉ binary at ∼3.5 kpc or a ∼(0.2, 0.07)M_☉ binary at ∼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^+0.08M_☉ primary and a 0.38_–0.06^+0.07M_☉ secondary at 3.43_–0.21^+0.19 kpc.