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Linking the FK5 to the ICRF

Published online by Cambridge University Press:  14 August 2015

F. Mignard  and
M. Froeschile
F. Mignard
Affiliation:
OCA/CERGA UMR CNRS 6527 Av. Copernic, 06130-Grasse (France)
M. Froeschile
Affiliation:
OCA/CERGA UMR CNRS 6527 Av. Copernic, 06130-Grasse (France)

Abstract

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The Hipparcos optical reference frame is compared to the basic FK5 in order to determine the orientation at T0 = 1991.25 and the global spin between the two frames. The components of the spin are significant and suggest a correction the IAU76 value of the precession constant and to a possible non-precessional motion of the equinox of the FK5. The regional errors are analysed with harmonic functions and found to be as large as 150 mas in position and 3 mas/yr in proper motion.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 313 - 316
Copyright
Copyright © Kluwer 1998

References

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