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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

Aoki, S., Guinot, B., Kaplan, G.H., Kinoshita, H., McCarthy, D.D., Seidelmann, P.K., 1982, ‘The new definition of Universal Time’, Astron. Astrophys., 105, 359–361.Google Scholar
Aoki, S. and Kinoshita, H., 1983, ‘Note on the relation between the equinox and Guinot’s non-rotating origin’, Astron. Astrophys. 105, 335–360.Google Scholar
Capitaine, N., 1990, The celestial Pole coordinates’, Celest.Mech.Dyn.Astr 48, 127–143.Google Scholar
Capitaine, N., Guinot, B., Souchay, J., 1986, ‘A nonrotating origin on the instantaneous equator: definition, properties and use’, Celest.Mech 39, 283–307.Google Scholar
Guinot, B. 1979, ‘Basic problems in the kinematics of the rotation of the Earth’, in Time and the Earth’s Rotation, Mc Carthy, D.D. and Pilkington, J. D. (eds), D. Reidel Publishing Company.Google Scholar
Sovers, O.J. and Fanselow, J.L., 1987, ‘Observation Model and Parameter Partials for the JPL VLBI Parameter Estimation Software “MASTERFTT”-1987.Google Scholar
Woolard, E.W., 1953, Theory of the Rotation of the Earth around its center of mass, Astr. Pap. Amer. Eph. Naut. Almanach XV, I, 1–165.Google Scholar