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We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A ~432) whose peak occurred on 2 May, 2007, with pronounced finite-source andparallax effects. We compute planet detection efficiencies for this event inorder to determine its sensitivity to the presence of planets around the lensstar. Both finite-source and parallax effects permit a measurement of theangular Einstein radius \theta_E = 0.48 +/- 0.01 mas and the parallax \pi_E =0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M_Sunand its distance to the observer D_L = 5.5 +/- 0.4 kpc. This is only the seconddetermination of a reasonably precise (<30%) mass estimate for an isolatedunseen object, using any method. This allows us to calculate the planetarydetection efficiency in physical units (r_\perp, m_p), where r_\perp is theprojected planet-star separation and m_p is the planet mass. When computingplanet detection efficiency, we did not find any planetary signature and ourdetection efficiency results reveal significant sensitivity to Neptune-massplanets, and to a lesser extent Earth-mass planets in some configurations.Indeed, Jupiter and Neptune-mass planets are excluded with a high confidencefor a large projected separation range between the planet and the lens star,respectively [0.6 - 10] and [1.4 - 4] AU, and Earth-mass planets are excludedwith a 10% confidence in the lensing zone, i.e. [1.8 - 3.1] AU.

Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050