B. G. Marsden Harvard-Smithsonian Center for Astrophysics Cambridge, MA 02138, U.S.A. !AU Symposium No. 81, "Dynamics of the Solar System", was held at the Hydrographic Office, Tokyo, Japan, during 23-26 May 1978. The Sym posium was cosponsored by COSPAR and IUTAM, and generous financial sup port was also provided by the Japan Society for the Promotion of Science. !AU sponsorship was through Commissions 4, 7 and 20, and the Scientific Organizing Committee consisted of the current Presidents, Vice Presi dents and immediate Past Presidents of these Commissions: V. K. Abalakin, R. L. Duncombe, Y. Kozai, L. Kresak, B. G. Marsden (Chairman), P. J. Message, A. M. Sinzi, G. Sitarski and V. G. Szebehely. There were 64 participants from 15 countries, and 55 invited and contributed papers were read. The papers covered all branches of re search on solar-system dynamics, and the eight sessions (chaired by Y. Kozai, V. G. Szebehely, W. Fricke, A. M. Sinzi, G. Sitarski, B. G.

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Proceedings of the IAU Symposium No. 81 held at the Hydrographic Office, Tokyo, Japan, May 23-26, 1978

Inhalt
Present Status of Celestial Mechanics.- I. Stability, N- and 3-Body Problems, Variable Mass.- Stability of the Solar System.- Numerical Studies on the Stability of the Solar System.- Stability of Periodic Planetary-Type Orbits of the General Planar N-Body Problem.- Periodic Orbits of Arbitrary Inclinations and Eccentricities in the General 3-Body Problem.- A Note as to a Perturbation of Hill's Curves.- Les Orbites de Collision du Probléme Restreint.- Libration of Retrograde Satellite Orbits in the Circular Plane Restricted Three-Body Problem.- Topology of the Negative Energy-Manifold of the Kepler Motion.- On Non-Stationary Problems of Celestial Mechanics.- An Extension of Newton's Equation of Motion.- Effect of Perturbed Potentials on the Stability of Libration Points in the Restricted Problem.- II. Planetary and Lunar Theories.- Construction et Précision de Nouvelles Théories Planétaires.- New Approach to the Planetary Theory.- Semi-Analytical Lunar Ephemeris The Main Problem.- The Satellite Case of the Three-Body Problem.- Formule d'Inversion de Lagrange et son Application à la Théorie des Perturbations.- A Precise Determination of Some Critical Terms in the Solar System.- Astronomical Measurements and Coordinate Conditions in Relativistic Celstial Mechanics.- III. Ephemerides, Equinox and Occultations.- The Ephemerides: Past, Present and Future.- Present Status of the Astronomical Ephemeris.- Observations of Mars 19501976 Compared to Ephemerides.- Ephemeris of Mars.- Where is the Equinox?.- The Rotation of the Mars Planet.- Solar System Occultation Predictions using Automated Microdensitometry Techniques.- IV. Satellites and Rings.- Review of the Theories of Motion of the Natural Satellites.- An Improvement of the Orbital Elements of Hyperion.-Theories of Resonant Satellite Pairs in Saturn's System.- The Motions of Uranus Satellites: Theory and Application.- Method of Surface of Section Applied to a Possible Capture Origin of Jupiter's Satellites.- Planetary Close Encounters: An Investigation on Temporary Satellite-Capture Phenomena.- The Rings of Saturn and Uranus.- Dynamics of Gravitating Systems of Colliding Particles in Planetary Discs.- The Rings of Planets and Cosmogony of the Solar System 203..- V. Minor Planets.- Asteroidal Motion at Commensurabilities Treated in Three Dimensions.- Recent Work on the Origin of the Kirkwood Gaps.- Evolution of Orbits in the Outer Part of the Asteroidal Belt and in the Kirkwood Gaps.- Hyperperiods, Orbital Stability, and Solution of the Problem of Kirkwood Gaps.- Secular Perturbations of Asteroids and Comets.- Three-Dimensional Distributions of Minor Planets and Comets.- The Discovery and Orbit of (2060) Chiron.- Recent Progress in the Theory of Trojan Asteroids.- A Review of Dynamical Evidence Concerning a Former Asteroidal Planet.- VI. Comets.- Empirical Data on the Origin of 'New' Comets.- The Shortage of Long-Period Comets in Elliptical Orbits.- Physical and Dynamical Evolution of Long-Period Comets.- On Some Characteristics of the Distribution of Perihelia of Long-Period Comets.- Dynamical Problems in the Preparation of the Catalogue of One-Apparition Comets.- Recent Dynamical History of the Six Short-Period Comets Discovered in 1975.- Characteris tics of Single Encounters of Long- Periodic Comets with Jupiter.- Long Propagation Periods of Residuals in the Motion of a Comet.- On the Orbit Mechanics of Cometary Dust Particles.- The Split Comets: Gravitational Interaction Between the Fragments.- On the Effect of Binary Encounters.- Some Statistics onLong-Period Comets.- Index of Names.- Index of Subjects.