The Gaussian form of the variationofparameter equations formulated in equinoctial elements  Applications: Airdrag and radiation pressure
Abstract
The Gaussian form of the equations for the variation of parameters is derived, particularly for the case of equinoctial elements. Equations are given for the true and eccentric longitudes as fast angular variables, and the perturbation is resolved along various mutually orthogonal components. The equations are applied to two cases of nonconservative perturbations: air drag and radiation pressure. Explicit firstorder results are presented for the variation of the equinoctial elements and time after one revolution.
 Publication:

Lausanne International Astronautical Federation Congress
 Pub Date:
 October 1984
 Bibcode:
 1984laus.iafcU....R
 Keywords:

 Aerodynamic Drag;
 Orbit Perturbation;
 Orbital Elements;
 Radiation Pressure;
 Satellite Orbits;
 Atmospheric Effects;
 Equations Of Motion;
 Equinoxes;
 Kepler Laws;
 Radiation Effects;
 Astrodynamics