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The microlens parallax is a crucial observable for conclusively identifyingthe nature of lens systems in microlensing events containing or composed offaint (even dark) astronomical objects such as planets, neutron stars, browndwarfs, and black holes. With the commencement of a new era of microlensing incollaboration with space-based observations, the microlens parallax can beroutinely measured. In addition, space-based observations can provideopportunities to verify the microlens parallax measured from ground-onlyobservations and to find a unique solution of the lensing lightcurve analysis.However, since most space-based observations cannot cover the full lightcurvesof lensing events, it is also necessary to verify the reliability of theinformation extracted from fragmentary space-based lightcurves. We conduct atest based on the microlensing event OGLE-2016-BLG-0168 created by a binarylens system consisting of almost equal mass M-dwarf stars to demonstrate thatit is possible to verify the microlens parallax and to resolve degeneracies byusing the space-based lightcurve even though the observations are fragmentary.Since space-based observatories will frequently produce fragmentary lightcurvesdue to their short observing windows, the methodology of this test will beuseful for next-generation microlensing experiments that combine space-basedand ground-based collaboration.

OGLE-2016-BLG-0168 Binary Microlensing Event: Prediction and Confirmation of the Micorlens Parallax Effect from Space-based Observation