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Determination of the Long Period Nutation Terms from Optical Astrometry and VLBI Data

Published online by Cambridge University Press:  12 April 2016

P. Yaya ,
C. Bizouard  and
C. Ron
P. Yaya
Affiliation:
Observatoire de Paris, 61 avenue de l’Observatoire, 75014 Paris, France
C. Bizouard
Affiliation:
Observatoire de Paris, 61 avenue de l’Observatoire, 75014 Paris, France
C. Ron
Affiliation:
Astronomical Institute, Academy of Sciences of the Czech Republic, Boční II, 141 31 Prague 4, Czech Republic

Abstract

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A 100-year long optical astrometric series of the Earth Orientation Parameters produced by a Czech team (Vondrák et al., 1998) has been analysed in order to determine components of nutation. Our interest is mostly focused on the long periodic terms: 18.6-year term, 9.3-year term and linear trend, still correlated in VLBI series which cover only the last 20 years. A comparison has been made with the corresponding values determined from the VLBI series.

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. 607 - 612
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Bizouard, C., Capitaine, N., Ron, C., Vondrák, J. 1997, Dynamics and Astrometry of Natural and Artificial Celestial Bodies, 481.Google Scholar
Souchay, J., Feissel, M., Bizouard, C., Capitaine, N., Bougeard, M. 1995, A&A, 299, 277.Google Scholar
Vondrák, J., Ron, C., Pešek, I., Čepek, A. 1995, A&A, 297, 899 Google Scholar
Vondrák, J., Pešek, I., Ron, C., Čepek, A. 1998, Publication of the Astronomical Institute of the Academy of Sciences of the Czech Republic, No. 87.Google Scholar