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Astron. Astrophys. 318, 639-652 (1997)

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1. Introduction

The dramatic improvement of the accuracy of the VLBI observations in the last decade leads to some estimations of the coefficients of the nutation of the Earth at a few microarcseconds accuracy. Thus it became necessary to be confident in the values of the coefficients of the nutation of the Earth for a simplified rigid model, at less at the microarcsecond level. In the present paper we check the analytically determined coefficients of the nutation for a rigid Earth model as calculated by Kinoshita & Souchay (1990), due to small influences of the potential of the Earth ([FORMULA], [FORMULA], [FORMULA], [FORMULA]), and to the direct torque exerted by the planets (also quoted as the direct planetary effect) up to their level of truncation, that is to say 5 microarcseconds. Moreover we calculate also the coefficients ranging between 0.1 microarcseconds and 5 microarcseconds, in order to perform a comparison with recent calculations done by Hartmann et al. (1995) and Williams (1995), respectively for the two kinds of effects above.

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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