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The Use of the Nonrotating Origin in the Computation of Apparent Places of Stars for Estimating Earth Rotation Parameters

Published online by Cambridge University Press:  12 April 2016

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

Abstract

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A new procedure has been devised for computing apparent places of stars in the intermediate frame (Capitaine 1990) linked to the nonrotating origin (Guinot 1979) for estimating the Earth rotation parameters (ERP) from astrometric observations. The latitude and time parameters as derived by this procedure have been compared to the parameters as derived from the classical procedure used for the reduction of Paris astrolabe observations (Chollet 1984). The consistency between the two procedures has been found to be of the order of a few 10−4ʺ, which is under the order of precision of the computations in the classical procedure. The new procedure, which is more directly related to the Earth rotation, is proposed to be used for the derivation of the ERP in the Hipparcos frame from existing astrometric observations, which is planned for the near future (IAU WG on “Earth Rotation in the Hipparcos Reference Frame”).

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 224 - 227
Copyright
Copyright © United States Naval Observatory 1991

References

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