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The Orientation of the Dynamical Reference Frame

Published online by Cambridge University Press:  12 April 2016

J.G. Williams ,
J.O. Dickey ,
X X Newhall  and
E.M. Standish
J.G. Williams
Affiliation:
Jet Propulsion LaboratoryCalifornia Institute ofTechnologyPasadena, CA 91109-8099USA
J.O. Dickey
Affiliation:
Jet Propulsion LaboratoryCalifornia Institute ofTechnologyPasadena, CA 91109-8099USA
X X Newhall
Affiliation:
Jet Propulsion LaboratoryCalifornia Institute ofTechnologyPasadena, CA 91109-8099USA
E.M. Standish
Affiliation:
Jet Propulsion LaboratoryCalifornia Institute ofTechnologyPasadena, CA 91109-8099USA

Abstract

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We summarize the current status of the JPL ephemerides, focusing on the various data types utilized, especially the impact of the modern ranging data, and the resulting accuracies obtained. The dynamical equinox, as determined from the analysis of Lunar Laser Ranging data, is determined with an accuracy of 5 mas and the obliquity to a 2 mas level in ~1983, the weighted center of data. Knowledge of the lunar and planetary positions with respect to the dynamical equinox degrades to 10 mas at J2000. Twenty years of LLR data allow for the separation of the 18.6 yr nutation terms from the precession constant. The correction to IAU precession is found to be −2.7 ± 0.4 mas/yr, while the 18.6 yr nutation of the pole is 3.0 ± 1.5 mas larger in magnitude than the 1980 IAU series. The necessity of different reference systems and the accurate knowledge of the interconnections between frames is addressed.

Type
Part 1. Oral Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 146 - 152
Copyright
Copyright © United States Naval Observatory 1991

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