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Overview and Proposition for a Modern Definition of the CEP

Published online by Cambridge University Press:  12 April 2016

Nicole Capitaine
Nicole Capitaine*
Affiliation:
DANOF/UMR8630-CNRS, Observatoire de Paris 61, avenue de l’Observatoire, 75014 - Paris, France, [email protected]

Abstract

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The current IAU conventional models for precession and nutation are referred to the Celestial Ephemeris Pole (CEP). However, the concept corresponding to the CEP is not clear and cannot easily be extended to the most recent models and observations. Its realization is actually dependent both on the model used for precession, nutation and polar motion and on the observational procedure for estimating the Earth orientation parameters. A new definition of the CEP should therefore be given in order to be in agreement with modern models and observations at a microarsecond level. This paper reviews the various realizations of the pole according to the models and observations and discusses the proposals for a modern definition of the CEP that are under consideration within the work of the subgroup T5 entitled “Computational Consequences” of the “ICRS” IAU Working Group.

Type
Part 7. Modern Definition of the Celestial Ephemeris Pole
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 571 - 584
Copyright
Copyright © Astronomical Society of the Pacific 2000

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