Improvements in the precession-nutation models

Details Improvements in the precession-nutation models Improvements in the precession-nutation models

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet...49c&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

Earth Rotation, Precession, Nutation

Scientific paper

This paper reviews a number of effects that must be taken into account in developing improved expressions for the precession of the Earth's equator in order to be dynamically consistent and compliant with up to date models for the ecliptic and the non-rigid Earth. These effects have been considered in the P03 and the parameterized P04 precession solutions of Capitaine et al. (2003, 2004); they are related to the ecliptic precession, to parameters of the non-rigid Earth such as the J2 rate (Bourda & Capitaine 2004) and to the expressions of the precession rates. We also report on similar effects to be considered in nutation, as well as on the influence, on precession-nutation, of the variations in Earth rotation that was recently clarified (Lambert & Capitaine 2004). Some recommendations are given on the best form of the precession-nutation expressions and the appropriate parameters to be fitted to observations.

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