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The IAU/IUGG Working Group on "Nutation for a non-rigid Earth", led byV\'eronique Dehant, won the European Descartes Prize in 2003, for its workdeveloping a new model for the precession and the nutations of the Earth. Thismodel (MHB2000, Mathews et al. 2002) was adopted by the IAU (InternationalAstronomical Union) during the General Assembly in Manchester, in 2000. It isbased (i) on some improvements for the precession model (with respect to theprevious one of Lieske et al. 1977) owing to the VLBI technique, and (ii) on avery accurate nutation model, close to the observations. With this prize, theDescartes nutation project could offer for international scientists somegrants, to be used for further improvements of the precession-nutation Earthmodel. At the IGG (Institute of Geodesy and Geophysics), with the OCCAM 6.1VLBI analysis software and the best data and models available, we re-analyzedthe whole VLBI sessions available (from 1985 till 2005) solving for the EarthOrientation Parameters (EOP). In this paper we present the results obtained forthe EOP and more particularly for the nutation series. We compare them with theother IVS analysis centers results, as well as with the IVS combined EOP seriesfrom the analysis coordinator. The series are in good agreement, except for thepolar motion coordinates that show a shift with respect to the other ones andthat we discuss here. Finally, we analyse the nutation series in the frameworkof the free core nutation (FCN) study and modelisation.

Analysis and comparison of precise long-term nutation series, strictly determined with OCCAM 6.1 VLBI software