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Lageos 2 spin rate and orientation

The Herstmonceux photometer system (which allows brightness measurements of sunlit satellites to be made simultaneously with laser ranging) has been upgraded to provide 1 millisecond time resolution. Precise timing of solar glints from the front faces of the corner-cube reflectors on Lageos 2 over a 2-year period has yielded a detailed record of the slowing of the satellite's rotation and an accurate determination of the precessional behaviour of the spin axis. These data make possible precise modelling of the non-gravitational forces on the satellite and contribute powerfully to evaluations of their evolution in the long-term.