Аннотация:The effect of the shape of the planet and central gravitating body on the orbital parameters of the planet are studied in this article. It is assumed that the planet and central body are oblate ellipsoids of revolution with uniform density and that the inclination of the rotational axis of the ellipsoid is fixed. Thus, a small variation in the force of attraction of the planet that arises is caused by the asymmetry of the mass distribution of the planet and central body with respect to the orbital plane. We have studied the evolution of the Keplerian orbit, its dimensions, eccentricity, and inclination under the effect of these factors. We have found equations describing the slow evolutionary motions, whose parameters and rate depend on the ratio of the sizes of the attracting bodies to their separation. Conclusions are reached about the evolution of the orbital parameters in the three-body problem.