  In this paper we present results of our studying of famous very young pair of
asteroids 6070 Rheinland and 54827 (2001 NQ8). We have done numeric integration
of orbits of pair with only planet perturbations and include Ceres and Vesta
effect. We have confirmed results of previous studying, obtained with different
integrators. And we confirm significant effect of Ceres and Vesta perturbation
on dynamic of this pair. We find that effect of other massive asteroids is
insignificant. According our results, more probable age of 6070 Rheinland and
54827 (2001 NQ8) pair is 16.2 kyrs. Our value of age is very close to most
recent age determination by Vokrouhlicky et al [12], obtained with different
method. After the compare our results, we can conclude, that non-gravitational
forces are small and large number of clones is not necessary in studying of
this pair. As an additional way of studying of close orbits dynamics, we
calculate relative velocity in pair during numeric integration. Normal
component of velocity show a very good convergence at epoch of closest
encounter in pair.
