A combined system of triaxial stabilization of an artificial satellite using gravitational-gradient and gyroscopic principles of stabilization is discussed. In the working position the system represents a dumbell consisting of two bodies: the main body and an auxiliary body containing the rotating flywheel, which are joined by a boom. The proposed system differs from earlier-known systems of gravitational stabilization in that restoring moments due to the gyroscopic properties of the rotating flywheel mounted at the end of the boom are created in order to assure the stabilization of the spacecraft in course and roll angles.