rootbrowseIAC-14A6session 99. Modelling and Orbit DeterminationPapers1. Observation and analysis of the apparent spin period variations of inactive box-wing geosynchronous resident space objects2. Results of two year dedicated Molniya-type HEO surveys3. an orbit determination method of improving parameters by the track direction error based on sparse observation data4. Orbit determination of space debris using a bi-static radar configuration with a multiple-beam receiver5. Analysis of Assumptions in Debris Environment Evolution Models6. Disposal strategy for the geosynchronous orbits of the Beidou Navigation Satellite System7. Reevaluation of the MASTER-2009 MLI and H-10 Debris Modeling8. A deformation model of flexible, high area-to-mass ratio debris for accurate propagation under perturbations9. Re-entry of spacecraft on highly eccentric orbits - Cluster-II10. Orbital debris atmospheric re-entry prediction