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Table 3

Systematic effects on the Earth orientation parameters after one century from J2000.0.

Catalog ΔX ΔY Δ(ERA − s) X/dt Y/dt dΔ(ERA − s)/dt

ICRF1 def 20.0 ± 8.0 107.1 ± 8.1  −18.5 ± 9.4 0.20 ± 0.08 1.07 ± 0.08  −0.16 ± 0.09
ICRF1 3.3 ± 4.9 22.1 ± 5.0  −4.0 ± 4.9 0.03 ± 0.05 0.22 ± 0.05  −0.04 ± 0.05
ICRF2 def 14.4 ± 7.1 0.7 ± 5.2  −28.0 ± 7.3 0.14 ± 0.07 0.01 ± 0.05  −0.28 ± 0.07
ICRF2 7.8 ± 2.1 88.9 ± 2.2  −4.6 ± 2.2 0.08 ± 0.02 0.89 ± 0.02  −0.04 ± 0.02

Notes. The derivatives of the corrections are derived from linear fits to the series of ΔX, ΔY, and Δ(ERA − s) over  ± 500 years. The corrections and their derivatives are in the unit of μas and μas   yr-1, respectively.

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