Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.234..237a&link_type=abstract
In ESA The European Astrometry Satellite HIPPARCOS: Scientific Aspects of the Input Catalog Preparation p 237-240 (SEE N86-1838
Astronomy and Astrophysics
Astronomy
5
Astronomical Catalogs, Extragalactic Radio Sources, Hipparcos Satellite, Reference Stars, Astrometry, Hubble Space Telescope, Masers, Position (Location), Space Observations (From Earth), Stellar Motions
Scientific paper
Methods for linking the positions and proper motions of stars measured by HIPPARCOS to a quasi-inertial system based on extragalactic objects are reviewed. The core catalog of extragalactic objects is a list of 235 radio sources. Virtually every source in this list is optically too faint for direct measurement by HIPPARCOS so that the link must be established indirectly using large ground based telescopes or the Hubble Space Telescope. Bright optical quasars and the Lick and Tautenburg photographic measurements of proper motions of stars relative to galaxies also provide useful links for proper motions (rotation stoppers). Certain radio stars and masers are directly observable by HIPPARCOS. Those having suitable radio and optical properties provide a very powerful method of linkage.
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