1IMCCE-Observatoire de Paris, UMR 8028 du CNRS, 77 Avenue Denfert-Rochereau, 75014 Paris, France
2Royal Observatory of Belgium, Avenue Circulaire 3, Uccle, 1180 Bruxelles, Belgium
Correspondence and requests for materials should be addressed to V.L. ([email protected]).
Received 12 January; accepted 30 April 2009.
Acknowledgements We thank D. Pascu for sharing his unpublished observations.
Author Contributions All authors contributed to the writing of the manuscript. V.L. developed and fitted to the observations the full numerical model presented in this work. J.-E.A. fitted to the observations the secular accelerations using L1 astrometric residuals (Supplementary Information). Theoretical calculations of the energy dissipation and Fig. 2 were made by Ö.K. T.V.H. and Ö.K. contributed to the geophysical interpretations of the secular accelerations.
