Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf...27l&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Since January 2003, the IAU recommends the use of the most precise precession-nutation model of Mathews et al. (2002), referred to as IAU 2000A, in astrometric and geodetic data reduction. The VLBI residuals against this model appear to have a rms around 200 microseconds of arc, yielding that a significant variance is still unexplained. This variance includes both deficiencies in the modeling of the Earth's rotation, including the unpredictable free core nutation, and in the observing and analysis strategy. I will expose several recent results concerning (i) the second order part of the nutation which was partly taken into account in IAU 2000A and has been clarified and accurately computed in a collaboration between P.M. Mathews and myself, (ii) the empirical modeling of the free core nutation and its atmospheric excitation, and (iii) some considerations concerning the fitting of models to VLBI data.
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