Distribution of orbital parameters from the MCMC fit of the set of astrometric data from Chauvin et al. (2012) (black), including the new astrometric data point gathered from the new H-band data (red; see Sect. 3.2). Top row: semi-major axis a (left) and e (right). Third row bottom: period P (left) and inclinaison i (right). Second row from bottom: argument of periastrom ω (left) and longitude of ascending node Ω (right). Bottom row: transit date (left) and distribution of χ². Red bars correspond to parameters found from the best LSLM χ² model. Green bars correspond to highly probable orbital parameters derived from the MCMC approach. The 1981 photometric events is reported as a thick black bar in the bottom-left diagram.