Sommaire — Contents.- 1 ère séance lundi 28 Mai, 9h.30—10h.45.- R. M. L.Baker jr.:The elimination of spurious data in the process of preliminary and definitive orbit determination.- G. N.Doubochine:Sur le mouvement de translation—rotation des corps céles tes artificiels.- 2ème séance lundi 28 Mai, 10h.45—12h.00.- P.Musen:On long range effects in the motion of artificial satellites…. 21.- D.Brouwer:Analytical study of resonance caused by solar radiation pressure.- 3ème séance lundi 28 Mai, 14h.30—17h.45.- A. M.Moltchanov:Sur l’évolution des systèmes planétaires.- S.Herrick:A Comparison of astronomical and ballistic traditions in orbit correction.- Y.Kozai: The potential of the earth derived from satellite motions.- Y. V.Batrakov: Perturbations in the motion of a satellite due to the second zonal harmonic of the Earth’s potential.- 4ème séance mardi 29 Mai, matinée.- R. H.Merson:A Pegasus computer programme for the improvement of the orbital parameters of an earth-satellite.- M. J.Davies: The determination of the small changes in the orbital elements of an earth satellite due to air drag.- D. K.Kulikov:Integration of equations of celestial mechanics by Cowell’s method with variable intervals.- L. G.Jacchia:The determination of atmospheric drag on artificial satellites.- 5ème séance mardi 29 Mai, après-midi.- W.Priester:Discussion of atmospheric heating sources based on the analysis of satellite drag data.- V. V.Beletsky:Some problems of motion of artificial satellites about the centre of mass.- M. L.Lidov:On the approximated analysis of the orbit evolution of artificial satellites.- S. P.Wyatt:The effect of terrestrial radiation pressure on satellite orbits.- G. C.McVittie:The general relativity “force” on a satellite.- 6ème séancemercredi 30 Mai, matinée.- A. S.Sochil?na:Determination of orbits based on visual and photographical observations.- W. M.Katjla:Satellite orbit analyses for geodetic purposes.- D. G.King-Hele:The contraction of satellite orbits under the action of air drag, allowing for the variation of scale height with altitude.- V. V.Beletsky:The libration of a satellite on an elliptic orbit.- 7 ème séance mercredi 30 Mai, après-mid.- V. N.Lebedevand B. N. Rumyantsev: Variation problem of transfer be tween two points in a central field.- R. J.Natjmann: Observed torques-producing forces acting satellites.- I.I.Shapiro:The prediction of satellite orbits.- N. N.Moisseyev:Sur certains problèmes mathématiques du mouvementrelatif des satellites.