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Consistency of Nutation Modeling in Radio Source Position Comparisons

Published online by Cambridge University Press:  12 April 2016

O.J. Sovers
O.J. Sovers*
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology4800 Oak Grove Drive Pasadena, California 91109

Abstract

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Comparisons between sets of radio source coordinates determined from independent VLBI measurements show that rotational offsets can be as large as several milliarcseconds (mas), and are considerably larger than the positional uncertainties (≤1 mas). The 1 to 2 mas discrepancies remaining after removal of the rotational offsets indicate the present true level of accuracy. Analyses of DSN and CDP astrometric data are performed to explore the effects of alternative schemes of nutation modeling on such catalog comparisons. It is concluded that rotations between different source catalogs are minimized or eliminated if the nutation models employed are consistent. Intrinsic source coordinate discrepancies, however, remain at the 1 mas level.

Type
Part 1. Oral Papers
Information
International Astronomical Union Colloquium , Volume 127: Reference Systems , 1991 , pp. 130 - 134
Copyright
Copyright © United States Naval Observatory 1991

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