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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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