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1958 Alpha Explorer 1959 al Vanguard 1959 Eta Vanguard 1963 Satellite 61 Explorer 9 acceleration of Satellite Anna lB April artificial satellites Atmospheric densities atmospheric drag Baker-Nunn camera C. A. Whitney Catalog of precisely Catalogue of satellite Colombo computed December 31 densities and temperatures derived from satellite earth's gravitational potential Echo 1 Rocket effect Explorer 9 February G. F. Schilling geomagnetic heterosphere Hynek information for Satellites Injun January July 1 Dec June 30 Kozai L. G. Jacchia MECHAU model atmosphere Moonwatch catalogue motion November observations of Satellites Observatory program October optical orbit information orbit of Satellite Orbital elements period perturbations positions of satellites precisely reduced observations preliminary prepared radiation pressure Satellite 1957 Beta satellite accelerations satellite observations Satellite orbital data Satellites 1958 Alpha Sept September Slowey Smithsonian Astrophysical Observatory solar Special Report Sputnik stellar atmospheres Sterne Telstar upper atmosphere variations Veis Zadunaisky zonal harmonics