Definition of the Celestial Ephemeris Origin and of UT1 in the International Celestial Reference Frame

Details Definition of the Celestial Ephemeris Origin and of UT1 in the International Celestial Reference Frame Definition of the Celestial Ephemeris Origin and of UT1 in the International Celestial Reference Frame

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...355..398c&link_type=abstract

Astronomy and Astrophysics, v.355, p.398-405 (2000)

Astronomy and Astrophysics

Astrophysics

29

Astrometry, Ephemerides, Reference Systems, Time

Scientific paper

The adoption of the International Celestial Reference System ICRS, and of the corresponding Frame, ICRF, by the 23rd General Assembly of the International Astronomical Union, calls for a redefinition of the departure point on the true equator. Several possibilities have been suggested. This paper considers the use of the non-rotating origin (Guinot 1979). The ``Celestial Ephemeris Origin'' (CEO) is defined here as the non-rotating origin on the equator of the Celestial Ephemeris Pole (CEP). Developments valid at the microarcsecond, based on the best model for precession, nutation and pole offset at J2000.0 with respect to the pole of ICRF, are provided for computing the CEP coordinates and the position of the CEO. It is shown that an operational definition of UT1 based on the CEO leads to values which are insensitive at the microarcsecond level to future improvements of this model. Table~1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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