We have investigated dynamics of charged particles and space balloons in the gravitational field of an oblate planet taking into account gravity of other celestial bodies, radiation pressure and the Lorentz force. In 1996 particles trajectories were constructed analytically using various averaging procedures. In 1997 we investigated influence of several disturbing factors on dynamical evolution of space balloons and dust complexes in the vicinity of the Sun, Mars and Saturn.

Model calculations for the dynamical evolution of zodiacal dust particles at several solar radii around the Sun (F-corona) were made. Periods of weak and strong solar magnetic field were considered. We have shown the absence of correlation between variations of the solar magnetic field and so called peak features of the near-infrared F-corona brightness in sublimation zone.

It is ascertained that radiation pressure modifies essentially shapes of the hypothetical dust clouds surrounding orbits of Phobos and Deimos, and decreases the mean escape velocity of the Deimos ejecta. We also explored time variations in the dust clouds due to individual impacts of larger meteorites. Concentration of centimeter-sized dust particles may be augmented by several orders.

We investigated the sources of dust in the outer saturnian system and the delivery of dust material to Titan. We have shown that Hyperion is an effective dust supplier for Titan. A new numerical model for Saturn's E ring is constructed taking into account all significant perturbations (in particular, Lorentz force arising from three zonal harmonics of planet's magnetic potential and plasma drag). Optical depth profiles were computed and compared to the observational data.

We proceed investigations of orbital evolution of space balloons in the regions of strong non-linear interplay between influences of Earth's oblateness and radiation pressure. Phase space was split into regions where trajectories have various analytical representation.