The adoption of ICRS on 1 January 1998: meaning and consequences

Details The adoption of ICRS on 1 January 1998: meaning and consequences The adoption of ICRS on 1 January 1998: meaning and consequences

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...331l..33f&link_type=abstract

Astronomy and Astrophysics, v.331, p.L33-L36 (1998)

Astronomy and Astrophysics

Astrophysics

51

Scientific paper

As of 1 January 1998, the celestial reference system adopted by the IAU will be based on a set of extragalactic directions, replacing the Fundamental Katalog No 5 (FK5) that gave star coordinates in a reference system (referred to as equator and equinox J2000) based primarily on the dynamics of the solar system. This change is deeper than a mere replacement of a reference system by a better one. It implies a drastic modification in the underlying concepts and has practical consequences at various levels for the users needing the best astrometric accuracy. The IAU decision begins a new era in the definition of reference systems and marks a sharp break with the practice of the last three hundred years characterized by the long series of fundamental star catalogues.

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