Expected accuracy of the 1900-1990 Earth orientation parameters in the Hipparcos reference frame

TL;DRAbstract

Based on the space and time distribution of observations available over 1900-1990 for estimating the motion of the Earth rotation axis in space and relative to the Earth's crust, and universal time, the accuracy of the Earth orientation parameters (EOP) is evaluated in the framework of their global analysis in the Hipparcos reference frame currently under preparation. Considering three test 20-yr periods (1900-1920, 1935-1955, 1965-1985) and 5-day solution, it is concluded that polar motion can be known to ±0.030″ in the first part of the century and ±0.009″ in the last part, and universal time to ±0.0008″ from the advent of atomic time

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