Influence of BB orbit uncertainty on parameters of the previous orbit. black dots show the results of the backward numerical integration of 5001 clones of BB stopped at the previous perihelion with all Galactic and stellar perturbations included. The center of the green circle marks the nominal result. The red histogram presents a marginal distribution of q_prev along with the best Gaussian approximation (green dots in the middle of each bar). The blue histogram is a marginal distribution of 1/a_prev.