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High-accuracy equation of equinoxes and VLBI astrometric Modelling

Published online by Cambridge University Press:  12 April 2016

A.M. Gontier  and
N. Capitaine
A.M. Gontier
Affiliation:
Observatoire de Paris - Central Bureau of I.E.R.S. 61, avenue de l’Observatoire, F-75014 Paris, France
N. Capitaine
Affiliation:
Observatoire de Paris - URA 1125 / CNRS 61, avenue de l’Observatoire, F-75014 Paris, France

Abstract

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In the course of implementing the use of nonrotating origin (Guinot 1979) in astrometric VLBI, for the transformation between celestial and terrestrial frames, we have compared the new approach with the classical one. We have shown that a difference exists between the two procedures at a few milliarcsecond level; this difference is due to the terms generally neglected when considering the equation of equinoxes in the classical representation of the Earth angle of rotation.

Type
VLBI Imaging
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 342 - 345
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

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