Trajectories of Artificial Celestial Bodies as Determined from Observa

In May 1962 the International Union of Theoretical and Applied Mechanics (IUTAM) organized a symposium in Paris on the theory of the movement of the Earth's artificial satellites designated to confront the results of the first spatial experiences with the mechanical point of view. The papers submitted during this meeting have been published in 1963 in a collection entitled "Dynamics of Satellites" by Springer Verlag. During the last three years the importance of studies pertaining to the dynamics of artificial satellites has continued to increase, and many results due to observations have led to a deeper knowledge of the field of forces in which these objects move, particularly the field of gravitation of the Earth, the forces due to pressure of radiation, friction of the atmosphere, etc . . . A new symposium seemed therefore suitable to determine these recent advances. However, this time it appeared appropriate to consider it more from the point of view of the interpretation obtained from the results of observations (determination of orbits and forces existing) than from the point of view of the theory of motion. For this reason the complete title of the second symposium is as follows: "Trajectories of Artificial Celestial Bodies, as Determined from Observations".

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On the Use of the Results Obtained from Synchronous Observations of the Artificial Satellites of the Earth from the INTEROBS Programme for Scientific Purposes.- Preliminary Analysis of INTEROBS Programme Observations.- Determination of the Quasi-Nodal Period of the Satellite 1960?3 from Simultaneous Visual Tracking Data.- Evaluation of the Satellite Period on the Base of Simultaneous Visual Tracking from Two Given Stations.- Some Orbit Determinations Using Visual and Other Observations.- A Method of Determination of the Major Axis of Artificial Earth Satellite Orbits Based on a Limited Number of Tracking Data..- Étude Fine d un Nombre Restreint d Observations.- Long-Range Analysis of Satellite Observations.- Orbit Determination Using Linearized Differential Equations.- Universal Variables.- Sur le Développement du Potentiel de la Terre par les Fonctions de LAMÉ.- The Effect of Precession of the Earth s Axis of Rotation on the Motion of an Artificial Satellite.- The Perturbations of the Orbital Elements Caused by the Pressure of the Radiation Reflected from the Earth.- Radiation on a Satellite in the Presence of Partly Diffuse and Partly Specular Reflecting Body.- Passive Spin Propulsion of Large Flexible Spherically Shaped Satellites by the Solar Radiation Field.- Dynamical Considerations Associated with the Geometric Determination of Position from Satellites.- Perturbed Motion of Satellites with Small Orbital Eccentricities.- Computational Methods Employed with Doppler Observations and Derivation of Geodetic Results.- A New Determination of the Even Zonal Harmonics of the Earth s Gravitational Field.- A New Determination of Non-zonal Harmonics by Satellites.- Estimation Problems in the Determination of the Even Zonal Harmonics of the External Potential of the Earth.- Comment on a Comparison Study Now Underway of Minimum Variance vs. Conventional Least Squares Differential Correction.- Investigation of the Conditions for Launching a Cometary Probe.- Determination of the Masses of the Moon and Venus and the Astronomical Unit from the Radio Tracking of Mariner II.- Plans for Analysis of Lunar Satellite Orbits.- Trajectories Around Both Masses in the Restricted Three Body Problem.- Analytical Index.