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The Theory of the Nutation for a Rigid Earth Model: Current State of the Situation

Published online by Cambridge University Press:  14 August 2015

J. Souchay  and
H. Kinoshita
J. Souchay
Affiliation:
Observatoire de Paris/DANOF, URA 1125 du CNRS, 61 Avenue de l’Observatoire, F-75014, Paris; E-mail: [email protected]
H. Kinoshita
Affiliation:
Tokyo National Astronomical Observatory, Ohsawa 2-21-1, Mitaka-Shi Tokyo 181, Japan

Extract

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Whereas no particular attention was paid to the theory of the nutation for a rigid Earth model, for more than a decade after the adoption by the International Astronomical Union (IAU) of coefficients as calculated and listed by Kinoshita (1977), an increasing number of studies have been done in the recent years aiming to improve this theory. The improvement became necessary mainly because of the big parallel improvement of the VLBI observations itself, which leads to present determinations of some coefficients of nutation at the level of a few 10μas. Therefore the amelioration of the theory of the nutation for a rigid Earth model can be divided in two aspects: one is to consider a smaller level of truncation of the coefficients of nutation; the other is to evaluate in the best way the coefficients already taken into account, particularly the leading coefficients which are typically those subject to the largest absolute differences.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 163 - 167
Copyright
Copyright © Kluwer 1998

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