This symposium was devoted to the so-called minor bodies in the Solar System, and their mutual interrelationships. Asteroids, comets and meteors provide essential information on the history of the Solar System, starting with the early phases of planetary formation, until the present epoch. Different evolutionary processes have shaped the physical characteristics of the populations of minor bodies. Among them, collisional phenomena have played an essential role, as has been generally recognized by modern planetary research. This symposium was one step in the effort to sketch a general unifying scenario of the properties of the different populations of minor bodies, which are generally studied by separate scientific communities. In particular, the most recent findings on the interrelationships between asteroids, comets and meteoroids suggest that an interdisciplinary approach should be preferred. Only in this way can the properties of different populations of minor bodies be interpreted in the framework of a coherent picture of the history and evolution of the Solar System.

THE MEETING The IAU Symposium 160 ASTEROIDS COMETS METEORS 1999 has been held at Villa Carlotta in Belgirate, on the shore of Lago Maggiore (Italy), from June 14 to June 18, 1993. It has been organized by the Astronomical Observatory of Torino and by the Lunar and Planetary Institute of Houston. It has been a very large meeting, with 323 registered participants from 38 countries. The scientific program included 29 invited reviews, 106 oral communications, and 215 posters. The subjects covered included all the aspects of the studies of the minor bodies of the solar system, including asteroids, comets, meteors, meteorites, interplanetary dust, with special focus on the interrelationships between these. The meeting was structured as follows. 5 morning plenary sessions have been devoted to invited reviews on: (1) search programs (2) populations of small bodies (3) dynamics (4) physical observations and modelling (5) origin and evolution. Two afternoon plenary sessions have been devoted to space missions to small bodies and to interrelationships between the different populations. The afternoon parallel sessions have been devoted to: dynamics of comets; Toutatis, Ida, Gaspra; physical processes in cometary comae and tails; meteorites; the cosmogonic message from cometary nuclei; physics of asteroids; the interplanetary dust complex; comet nuclei; meteors; composition and material properties of comets; dynamics of asteroids.