Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177...57a&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 57-59 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
Astrometry, Esa Satellites, Inertial Reference Systems, Radio Astronomy, Criteria, Data Bases, Hubble Space Telescope, Interferometry, Reference Stars, Spaceborne Astronomy
Scientific paper
The use of radio interferometry, Hipparcos satellite, and Space Telescope data to construct an intertial reference frame for astrophysics and geophysics is discussed. Sources chosen have a starlike image with no structure, no companion within 2 arcsec, and no nebulosity to degrade optical measurement accuracy. No large scale structure exceeding 1 arcsec in the radio range above 1 GHz is accepted. An optically identified counterpart brighter than 18 mag is required to meet Space Telescope capabilities. The data base is overpopulated by a factor of 10. Extra data can be used to compare two catalogs, for example, even though the stars do not qualify as benchmarks.
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