Analysis of the accuracy of prediction of the celestial pole motion |
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| Authors: | Z M Malkin |
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| Institution: | 1.Pulkovo Observatory,Russian Academy of Sciences,St. Petersburg,Russia |
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| Abstract: | VLBI observations carried out by global networks provide the most accurate values of the precession-nutation angles determining
the position of the celestial pole; as a rule, these results become available two to four weeks after the observations. Therefore,
numerous applications, such as satellite navigation systems, operational determination of Universal Time, and space navigation,
use predictions of the coordinates of the celestial pole. In connection with this, the accuracy of predictions of the precession—nutation
angles based on observational data obtained over the last three years is analyzed for the first time, using three empiric
nutation models-namely, those developed at the US Naval Observatory, the Paris Observatory, and the Pulkovo Observatory. This
analysis shows that the last model has the best of accuracy in predicting the coordinates of the celestial pole. The rms error
for a one-month prediction proposed by this model is below 100 microarcsecond. |
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