""Cover""; ""Title""; ""Copyright""; ""Table of Contents""; ""Preface""; ""Background""; ""Current Orbital Debris Environment""; ""Evolution of the Artificial Earth Satellite Environment""; ""Hypervelocity Impact and Upper-Stage Breakups""; ""Breakup Studies""; ""Preliminary Analysis of the Fragmentation of the Spot 1 Ariane Third Stage""; ""Explosive Fragmentation of Orbiting Propellant Tanks""; ""Characteristics of Satellite Breakups from Radar Cross Section and Plane-Change Angle""; ""Albedo Estimates for Debris""; ""Ariane-Related Debris in Deep-Space Orbit""
""Potential Spot-1 R/B-Cosmos 1680 R/B Collision""""Control of Debris from Breakups""; ""Removal of Orbital Debris""; ""Cost Estimates for Removal of Orbital Debris""; ""Collision Probabilities in Geosynchronous Orbit and Techniques to Control the Environment""; ""Prevention of Breakups: Upper-Stage Operational Procedures""; ""Current Operational Practice for the Delta Second Stage""; ""Ariane Third Stage: Current Operational Practice and Modifications Expected""; ""Centaur Upper Stage""; ""Safing of H-1 Second Stage After Spacecraft Separation""; ""Author Index for Volume 121""