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Principal Term of Nutation from the Combination of VLBI Observations and Optical Astrometry

Published online by Cambridge University Press:  12 April 2016

C. Bizouard ,
N. Capitaine ,
C. Ron  and
J. Vondrák
C. Bizouard
Affiliation:
Observatoire de Paris, DANOF Paris, France
N. Capitaine
Affiliation:
Observatoire de Paris, DANOF Paris, France
C. Ron
Affiliation:
Astronomical InstitutePraha 4, Czech Republic
J. Vondrák
Affiliation:
Astronomical InstitutePraha 4, Czech Republic

Abstract

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The celestial pole offsets (CPO) in provisional HIPPARCOS reference frame determined from the optical astrometry observations since 1899.7 until 1992.0 (Vondrák et al., 1996) and CPO determined from VLBI observations since 1980.0 until 1996.0 (Ma et al., 1996) are combined to get amplitudes of the long periodic nutation terms 18.6 and 9.3 years, respectively. The amplitudes are compared with previous solution based only on VLBI observations (Souchay et al., 1995).

Type
Reference Systems and Astronomical Standards
Information
International Astronomical Union Colloquium , Volume 165: Dynamics and Astrometry of Natural and Artificial Celestial Bodies , 1997 , pp. 481 - 486
Copyright
Copyright © Kluwer 1997

References

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