The LARASE Spin Model of the two LAGEOS and LARES satellites.

Lucchesi D.M., Anselmo L., Bassan M., Magnafico C., Pardini C., Peron R., Pucacco G., Stanga R., Visco M.
  Venerdì 30/09   15:00 - 18:00   Edificio Psicologia 2 - Aula 2E   III - Astrofisica
The LARASE (LAser RAnged Satellites Experiment) research program has its main objectives in tests and measurements of General Relativity (GR) via Precise Orbit Determination of a set of geodetic satellites. In order to reach such goals by means of very precise measurements of a number of relativistic parameters (and, at the same time, to provide a robust and unassailable error budget of the main systematic effects), we are also reviewing previous models and we are developing new models for the main perturbations that act on the orbits of the two LAGEOS and on that of LARES satellites. We focus on modeling the spin vector of these satellites. The spin knowledge, both in orientation and rate, is of fundamental importance in order to correctly model the thermal effects acting on the surface of these satellites. These are very important non-gravitational perturbations that produce long-term effects on the orbit of the cited satellites, and improvements in their modeling will be very useful both in the field of GR measurements and in those of space geodesy and geophysical applications.