rootbrowseIAC-09A6session 22. Modeling and Risk AnalysisPapers1. Orbit Determination Performance Improvements for High Area-to-mass Ratio Space Object Tracking Using an Adaptive Gaussian Mixtures Estimation Algorithm2. GEOSYNCHROUS ENVIRONMENT FOR ORDEM20083. The MASTER-2009 Fragmentation Model for the Small Size Regime4. Long term consequences of the Iridium 33 - Cosmos 2251 collision5. analysis for chain-crash risk of leo satellite due to collision between iridium-33 and cosmos-22516. A New Space Debris Environment Model SDEM7. NaK release model for MASTER-20098. Impact sensing systems and estimated impact rates of the upcoming Meteoroid and Space Debris Detector experiment (MDD3) onboard Russian Spektr-R satellite9. Improved Orbital Debris Trajectory Estimation Based on Sequential TLE Processing10. Success Rate and Effect of using Electrodynamic Tether System for De-orbit LEO Spacecraft