Dynamics of Comets: Their Origin and Evolution -

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Résumé :
Proceedings of the 83rd Colloquium of the International Astronomical Union held in Rome, Italy, June 11-15, 1984

Sommaire:
Section I. Origin of Comets.- The origin of comets among the accreting outer planets (Invited).- Statistical test of the distribution of perihelion points and its implication for cometary origin.- Molecular clouds: comet factories?.- Dynamical interactions of the Solar System with massive nebulae.- Section II: The Oort Cloud of Comets.- The formation and dynamical survival of the comet cloud (Invited).- Empirical data from Oortf's cloud.- Dynamical evolution of the Oort cloud.- Stellar perturbations on comets.- Some remarks about the aphelion distribution of long period comets on the sky.- Section III. Meteor Streams and Interrelations with Minor Planets.- The formation and evolution of meteor streams.- The transition between long period comets, short period comets and meteoroid streams.- The past and future of 1983 TB and its relationship to the Geminid meteor stream.- Interrelations between comets and asteroids (Invited).- On the rotation of cometary nuclei and small asteroids.- The orbital evolution of meteor streams at the 2/1 resonance with Jupiter (Extended abstract).- Dynamical effects of cometary bombardment of Saturn's rings and moons (Extended abstract).- Section IV. Dynamics of Comets: Numerical Modelling.- An efficient integrator that uses Gauss-Radau spacings (Invited).- The Long-Term Evolution Project.- Errors in numerical integrations and chaotic motions.- One of the problems of long-term integrations of cometary orbits.- The role of the researches of E.I. Kazimirchak-Polonskaya on the dynamical evolution of short-period comets.- Review of studies on capture of comets by Neptune and its role in the dynamic evolution of cometary orbits.- Section V. Dynamics of Comets.- Statistical and numerical studies of the orbital evolution of short-period comets(Invited).- The aging and lifetimes of comets (Invited).- Planetary perturbations, dynamical energy and evolution of orbital elements of periodic comets.- The problem of the 1/a-distribution and cometary fading.- First results of the integration of motion of short-period comets over 800 years.- Section VI. Nongravitational Forces.- Nongravitational forces on comets: the first fifteen years (Invited).- Do comet groups exist?.- A study of the pre-discovery motion of the two asteroids 1983 SA and 1983 XF.- Influence of non-gravitational forces on the orbital evolution of the short-period comets.- On the nongravitational effects in the comet Encke motion.- Section VII. Comet P/Halley and Future Missions to Comets.- The dynamical history of comet Halley (Invited).- The past orbit of comet Halley and its meteor stream.- The International Cometary Explorer (ICE) Mission to comet Giacobini-Zinner (G/Z).- The selection of comets for future space missions.- Name Index.- Discussion Index.- List of Participants....