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Deficiencies in the Nutation Model from VLBI Observations

Published online by Cambridge University Press:  07 August 2017

Y. F. Xia  and
J. Gao
Y. F. Xia
Affiliation:
Department of Astronomy Nanjing University Nanjing, 210008 P. R. China
J. Gao
Affiliation:
Department of Astronomy Nanjing University Nanjing, 210008 P. R. China

Abstract

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A VLBI series of celestial pole offsets has been used for deriving the corrections to the main terms of the IAU 1980 nutation series using the least squares solution and amplitude spectra method. The results are compared with current geophysical models. The discrepancies between observations and theory are largely due to deficiencies in the nutation models. A retrograde periodic variation (at a period of 420.0 days) has been revealed. The free mode will give us futher information on the core-mantle boundary.

Type
Celestial Reference Frame
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 381 - 386
Copyright
Copyright © Kluwer 

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