Resonance at descent in the mars's atmosphere of analogue of the beagle 2 lander

The uncontrolled motion of analogue the Beagle 2 Lander is considered in the rarefied Mars's atmosphere. Such reentry vehicle has small lengthening and the blunted form for effective braking. Such Lander can have three balancing positions of a spatial angle of attack: a* = 0, a* not equal 0, a* = pi depending on position of the center mass. It can result in a resonance at change of a dynamic pressure at descent in an atmosphere. It is shown, that numerical integration of motion equations do not allow receiving authentic results because of probabilistic character of transients connected to a resonance. Conditions of stability of movement are received for various areas of movement at a resonance. Calculation of the top and bottom estimations of parameters of movement is offered to spend with use of the averaged equations. Researches are shown, that the resonance could be cause of accident the Beagle 2 Lander.