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Table 1.

Weighted fits of three models to VLBI residuals (1979.6–2018.6), corresponding to the IAU 2006/2000 model.

Term t0 t1 t2 sin(18.6 yr) cos(18.6 yr) sin(9.3 yr) cos(9.3 yr) WRMSpre WRMSpost
Unit (μas) (μas cy−1) (μas cy−2) (μas) (μas) (μas) (μas) (μas) (μas)
opa2018a dX 18 ± 1 266 ± 21 −4338 ± 143 126 119
dY −86 ± 1 −519 ± 22 5325 ± 145 147 130

gsf2016a dX 49 ± 1 215 ± 19 540 ± 120 134 104
dY −101 ± 1 −477 ± 20 5492 ± 122 131 109


opa2018a dX 13 ± 1 381 ± 12 36 ± 1 −18 ± 1 126 116
dY −71 ± 1 −34 ± 12 −35 ± 1 40 ± 1 147 128

gsf2016a dX 49 ± 1 441 ± 10 43 ± 1 −11 ± 1 134 101
dY −87 ± 1 61 ± 10 −34 ± 1 47 ± 1 131 107


opa2018a dX 13 ± 1 334 ± 12 34 ± 1 −24 ± 1 −19 ± 1 −3 ± 1 126 116
dY −70 ± 1 4 ± 12 −38 ± 1 46 ± 1 22 ± 1 23 ± 1 147 126

gsf2016a dX 49 ± 1 413 ± 11 41 ± 1 −14 ± 1 −13 ± 1 3 ± 1 134 101
dY −84 ± 1 40 ± 11 −43 ± 1 48 ± 1 20 ± 1 23 ± 1 131 105

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