Systematic Differences between the FK5 Proper-Motion System and Hipparcos

Details Systematic Differences between the FK5 Proper-Motion System and Hipparcos Systematic Differences between the FK5 Proper-Motion System and Hipparcos

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasp..112.1103z&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 112, Issue 774, pp. 1103-1111.

Astronomy and Astrophysics

Astronomy

8

Astrometry, Catalogs, Reference Systems

Scientific paper

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. Region-, 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 systematics nor large regional errors between the two systems.

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