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A Global VLBI/LLR Analysis for the Determination of Precession and Nutation Constants

Published online by Cambridge University Press:  12 April 2016

P. Charlot ,
O.J. Sovers ,
J.G. Williams  and
X X Newhall
P. Charlot
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology4800 Oak Grove Drive, Pasadena, California 91109 Central Bureau of IERS, Observatoire de Paris 61 Avenue de l’Observatoire, 75014 Paris, France
O.J. Sovers
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology4800 Oak Grove Drive, Pasadena, California 91109
J.G. Williams
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology4800 Oak Grove Drive, Pasadena, California 91109
X X Newhall
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology4800 Oak Grove Drive, Pasadena, California 91109

Abstract

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Two decades of LLR data and one decade of VLBI data are combined in a global analysis to yield improved estimates of the Earth’s precession and nutation. In this analysis, LLR provides a strong determination of precession, while VLBI is stronger in fixing nutation terms with short periods. In all, 24 nutation amplitudes are estimated. The largest correlation coefficient, between precession and 18.6 yr out-of-phase nutation in longitude, is 0.88. With the exception of some 9 yr and 18.6 yr terms, formal uncertainties are 0.1 to 0.2 milliarcseconds.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 228 - 233
Copyright
Copyright © United States Naval Observatory 1991

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