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Comparison of Hipparcos Proper-Motion System to the FK5

Published online by Cambridge University Press:  12 April 2016

Zi Zhu  and
Wenjing Jin
Zi Zhu
Affiliation:
Shaanxi Astronomical Observatory, P.O. Box 18, Lintong, China
Wenjing Jin
Affiliation:
Shanghai Astronomical Observatory, Shanghai, China

Abstract

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We present an intensive analysis of the FK5 proper-motion system via the two large astrographic catalogs, the PPM and ACRS catalogs, compared with the Hipparcos proper motions. Regional, magnitude, and color-dependent systematic errors in the PPM and ACRS proper motions are found, and exhibit similar tendencies for both catalogs. The term of the global rotation between the FK5 and Hipparcos proper-motion systems cannot be explained by the constant of the FK5 precessional correction, which is given by the VLBI and LLR observations. Comparing the Hipparcos proper motions with those of the SPM 2.0 Catalog, which provides absolute proper motions of objects measured directly relative to external galaxies, we found neither strong systematic nor large regional errors between the two systems.

Type
Section 1. Celestial Reference System and Frame
Information
International Astronomical Union Colloquium , Volume 180: Towards Models and Constants for Sub-Microarcsecond Astrometry , March 2000 , pp. 104 - 109
Copyright
Copyright © US Naval Observatory 2000

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