LONG-TERM ORBITAL EVOLUTION OF DUST PARTICLES EJECTED FROM COMET ENCKE

The 10,000 year long-term orbital evolution of six model dust particle s ejected from the comet Encke at its perihelion has been investigated . Particles with ejection velocity 40 m s-1 were released in the follo wing directions (two orientations for each direction): tangential to t he cometary motion, normal to the comet's orbital plane and perpendicu lar to the preceding ones. Planetary perturbations, excluding Pluto, a nd the simultaneous action of the Poynting-Robertson effect and the we ll-known form of the equation for the solar wind have been taken into account. Simulations have been done for dust particles of several size s (0.1-1.5 cm). The obtained dispersions in orbital elements have been compared with the data observed.