On the IAU 2000/2006 precession–nutation and comparison with other models and VLBI observations |
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Authors: | N Capitaine P M Mathews V Dehant P T Wallace S B Lambert |
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Institution: | (1) SYRTE, Observatoire de Paris, CNRS, UPMC, Paris, France;(2) Department of Theoretical Physics, University of Madras, Chennai, India;(3) Royal Observatory of Belgium, Brussels, Belgium;(4) Space Science & Technology Department, STFC/RAL, Didcot, Oxon, UK |
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Abstract: | In this paper, we discuss the fundamental aspects of the semi-analytical precession–nutation models that were adopted by IAU
Resolutions in 2000 and 2006. We show that no significant discrepancies appear between those models (Mathews et al., J Geophys
Res 107:B4, ETG 3-1–3-26, 2002, Capitaine et al., Astron Astrophys 412:567– 586, 2003) and other semi-analytical solutions
or the INPOP06 numerical integration (Fienga et al., Astron Astrophys 477:315–327, 2008), especially for the quadratic terms.
We also report on the most recent comparisons of the models with VLBI observations. We have employed different empirical models
to fit the residuals, in attempting to characterize the nature of the observed curvature. The efficiencies of those empirical
models are compared and their interpretations in terms of physical mechanisms are discussed. We show that a combination of
linear and 18.6-year corrections is the most credible model for explaining the currently observed residuals, but that a longer
span of observations is required before the true character of the effect can be determined. We note that the predictions from
the ERA-2005 theory (Krasinsky, Celest Mech Dyn Astron 96:169–217, 2006) have diverged from recent VLBI results and suggest
that the empirical nature of the ERA model is responsible. |
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Keywords: | Earth rotation Precession-nutation VLBI observations Reference systems |
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