1. Symplectic Mapping for Satellites and Space Debris Including Nongravitational Forces

   • Sławomir Breiter
   • Gilles Métris

   OriginalPaper Pages: 79 - 94

2. Obtaining the free frequencies of the non‐rigid Earth

   • Juan Getino
   • José M. Farto
   • José M. Ferrándiz

   OriginalPaper Pages: 95 - 108

3. Averaging on Earth‐Crossing Orbits

   • G. F. Gronchi
   • A. Milani

   OriginalPaper Pages: 109 - 136

4. Derivatives of the Gravity Potential with Respect to Rectangular Coordinates

   • Gilles Métris
   • Jin Xu
   • Iwona Wytrzyszczak

   OriginalPaper Pages: 137 - 151