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The understanding of the FK5 and Hipparcos proper-motion systems

Published online by Cambridge University Press:  01 October 2007

Z. Zhu*
Affiliation:
Department of Astronomy, Nanjing University, China email: zhuzi@nju.edu.cn
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Abstract

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Comparing proper motions of the FK5 and Hipparcos, several authors declared that the two proper-motion systems are inconsistent with the value of the precession correction obtained from VLBI and LLR observations. Based on the proper-motion data from the PPM and ACRS catalogues which are constructed on the FK5 system, the inconsistent values of the precessional correction and of the time-dependent term of equinox correction, derived from the different subsets of stellar samples, have been found. One of the reasons for those discrepancies should be mostly due to the internally biased proper-motion system of the FK5.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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