Evolution of rotations of symmetric gyrostat in gravitational field and resistive medium

Rapid rotational motion of a dynamically symmetric satellite about a center of mass under the action of gravitational torque and the external resistance torque is studied. The satellite has a cavity filled with high-viscosity fluid. Orbital motions with an arbitrary eccentricity are supposed to be specified. The system, obtained after averaging over the Euler?Poinsot motion and applying the modified averaging method, is analyzed. The analytical study and numerical analysis are performed. It is discovereg that the modulus of the angular momentum decreases. The orientation of the angular momentum vector in the orbital frame of reference is determined.