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On the Accuracy of the 1980 IAU Nutation Series

Published online by Cambridge University Press:  12 April 2016

Ya. S. Yatskiv  and
S. M. Molodensky
Ya. S. Yatskiv
Affiliation:
Main Astronomical Observatory of the Ukrainian Academy of Sciences Kiev, U.S.S.R
S. M. Molodensky
Affiliation:
Institute of the Earth’s Physics of the U.S.S.R. Academy of Sciences Moscow, U.S.S.R

Extract

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At the Seventeenth IAU General Assembly in Montreal, Canada, in 1979, the resolution was passed adopting the 1979 Nutation Series, which was based on: - the development of the rigid theory by Kinoshita (1977); - the modifications to this theory allowing for the effects of a fluid core and an elastic shell (Molodensky, 1961). The purpose of this action has been nothing but the adoption of a working Standard on Nutation. The details that follow are well known (Seidelmann, 1980). After a discussion at IAU Colloquium N°56 in Warsaw, Poland, in 1980, the Working Group on Nutation decided to recommend a change to the 1980 IAU Nutation Series, which is based on the theory developed by Wahr (1980). The differences between the above mentioned Series are within the limits of ±0002 and are not detectable with the present observational accuracy. As an example, we summarized in Table 1 the observed amplitudes of circular nutation component (2L☾−α) which were determined from astronomical observations with best accuracy. The effect of O1-tide on this component is taken into account by using the theoretical tide with Λ=1+k−1=1.2. The theoretical amplitudes of this component were reduced to the mean epochs of observations.

Type
Part IV
Information
International Astronomical Union Colloquium , Volume 63: High-Precision Earth Rotation and Earth-Moon Dynamics , May 1981 , pp. 287 - 292
Copyright
Copyright © Reidel 1982

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