... Format of the orbital elements | ... Collection of the determined by KIAM orbital elements valid for the backward integration of the spacecraft motion . Collection of the modified by IKI orbital elements valid for the forward integration of the spacecraft motion . Two kinds of the INTERBALL Tail probe orbital elements' collections are presented here. ... The backward in time integration was fulfilled at IKI for Tail probe orbit from now up to the launch. ... IKI RAN | SSC IKI RAN | ...