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- W2155476697 abstract "The adoption of the International Refer- ence 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 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." @default.
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- W2155476697 date "2000-01-01" @default.
- W2155476697 modified "2023-10-02" @default.
- W2155476697 title "Definition of the Celestial Ephemeris Origin and of UT1 in the International Celestial Reference Frame" @default.
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