Period-mass probability distribution for the possible companion object of star 39810, obtained from orbital simulations, assuming the real observing epochs and circular obits. In the upper panel we show the results in the hypothesis that the star belongs to the cluster (as demonstrated by proper motions, radial velocities, and position in the CMD), whereas in the bottom panel we show the result if the star is a common field object: σ_obs = 1595 m/s,  m/s,  m/s.