Physical Study of Comets, Minor Planets and Meteorites (L’etude Physique Des Cometes. Des Petites Planetes et Des Meteorites)

Abstract

The period covered by this report, July 1987 to June 1990, witnessed a similar activity as the previous triennial interval. While the latter saw the successful encounters of several space probes with comets P/Giacobini-Zinner and P/Halley as well as the unprecedented worldwide campaigns of ground-based measurements organized by the International Halley Watch, emphasis during the 1987–1990 time period focussed mostly to the analysis of existing data, while the study of new comets continued at a slightly increased level.