On the celestial reference pole

Details On the celestial reference pole On the celestial reference pole

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19...27x&link_type=abstract

Progress in Astronomy, Vol. 19, No. 1, p. 27 - 33 (2001)

Astronomy and Astrophysics

Astronomy

Nutation, Celestial Reference Pole, Earth Orientation Parameters

Scientific paper

The computation of nutation series and the estimation of the earth orientation parameters (EOP) make use of an intermediate pole. Since the adoption of the IAU 1980 theory of nutation, the reference pole is the celestial ephemeris pole (CEP). The CEP is currently realized in the accuracy of 0.1mas by an improved precession-nutation model and the estimation of the EOP from various techniques. In the accuracy of microarcsecond, the diurnal and sub-diurnal components of the pole must be taken into account both in the terrestrial reference system (TRS) and in the celestial reference system (CRS). Moreover, the new observing procedure provides the estimation of the EOP with a few hour resolution. The reference pole has therefore to be redefined. The concepts of the different reference poles and the defintion of the CEP are described. The relization of the CEP and its deficiencies are reviewed. A new celestial reference pole, CIP, is introduced.

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