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Procedure for VLBI Estimates of Earth Rotation Parameters Referred to the Nonrotating Origin

Published online by Cambridge University Press:  12 April 2016

N. Capitaine  and
A.M. Gontier
N. Capitaine
Affiliation:
Observatoire de Paris - URA 1125/CNRS 61, Avenue de l’Observatoire 75014 - ParisFRANCE
A.M. Gontier
Affiliation:
Observatoire de Paris - URA 1125/CNRS 61, Avenue de l’Observatoire 75014 - ParisFRANCE

Abstract

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This paper investigates the practical use of the nonrotating origin (NRO) (Guinot 1979) for estimating the Earth Rotation Parameters from VLBI data, which is based on the rotational transformation between the geocentric celestial and terrestrial frames as previously derived by Capitaine (1990). Numerical checks of consistency show that the transformation referred to the NRO is equivalent to the classical one referred to the equinox and considering the complete “equation of the equinoxes” (Aoki & Kinoshita 1983). The paper contains the expressions for the partial derivatives of the VLBI geometric delay to be used for the adjustment of the pole coordinates, UT1 and deficiencies in the two celestial coordinates of the Celestial Ephemeris Pole (CEP) in the multiparameters fits to VLBI data. The use of the NRO is shown to simplify the estimates of these parameters and to free the estimated UT1 parameter from the model for precession and nutation.

Type
Part 1. Oral Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 77 - 84
Copyright
Copyright © United States Naval Observatory 1991

References

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