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Precession-Nutation Estimates from Optical Astrometry 1899.7–1992.0 and Comparison with VLBI Results

Published online by Cambridge University Press:  12 April 2016

Jan Vondrák  and
Cyril Ron
Jan Vondrák
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic, Boční II, 141 31 Prague 4, Czech Republic
Cyril Ron
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic, Boční II, 141 31 Prague 4, Czech Republic

Abstract

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The most recent solution of Earth orientation parameters from the observations made by optical astrometry in 1899.7-1992.0 at 33 observatories is used to estimate the corrections of the present IAU model of precession-nutation. Since the resolution of the solution is about five days, only the terms with periods of 14 days and longer are considered. The results are compared with VLBI-based corrections of the standard precession-nutation model, and the differences are discussed.

Type
Section 2. Improved Definitions and Models
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 248 - 253
Copyright
Copyright © US Naval Observatory 2000

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