Global astrometry by space techniques

Details Global astrometry by space techniques Global astrometry by space techniques

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cemec..22..153k&link_type=abstract

(Symposium on Star Catalogues, Positional Astronomy and Celestial Mechanics, Washington, D.C., Nov. 30, 1978.) Celestial Mechani

Astronomy and Astrophysics

Astronomy

8

Astrometry, Astronomical Catalogs, Esa Satellites, Spaceborne Astronomy, Stellar Motions, Accuracy, Astronomical Coordinates, Celestial Reference Systems, Parallax, Satellite-Borne Instruments, Spaceborne Telescopes

Scientific paper

The European Space Agency project of an astrometric satellite HIPPARCOS - is briefly described. It will measure the angles between stars situated in fields separated by about 70 deg. The precision of the elementary measurements is expected to be of the order of 0.005 arcsec. A similar accuracy is found to apply to the basic reduction giving the abcissae of stars referred to great circles on the sky. The final overall reductions should yield accuracies better than 0.002 arcsec in position and parallaxes and 0.002 arcsec per year in proper motions. The main features of the final catalogue are described and some possible consequences for fundamental astronomy are given.

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