Comparison of VLBI nutation series with the IAU2000A model

Details Comparison of VLBI nutation series with the IAU2000A model Comparison of VLBI nutation series with the IAU2000A model

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agss.conf...24m&link_type=abstract

Proceedings of Journees 2003: Astrometry, Geodynamics and Solar System Dynamics: from milliarcseconds to microarcseconds, St.

Astronomy and Astrophysics

Astronomy

8

Earth Rotation, Precession, Nutation, Free Core Nutation, Vlbi

Scientific paper

Three most long and dense VLBI nutation series obtained at the Goddard Space Flight Center, Institute of Applied Astronomy, and U.~S.Naval Observatory, containing about 3000 estimates of the nutation angles were used for investigation of systematic differences between observations and IAU2000A model. Bias and secular trends (precession and obliquity rate) were estimated together with main periodical terms for three periods of observations. It is shown that result substantially depends on period of observations used in analysis. Corrections to some IAU2000A nutation terms were also estimated and found to be at the level up to several tens microarcseconds. A new Free Core Nutation model with variable amplitude and period (phase) is developed. Comparison of this model with observations shows better agreement than existing one.

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