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Table 5.

Weighted fits of the joint series (1970.7–2018.5) to three models, 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 (mas) (mas cy−1) (mas cy−2) (mas) (mas) (mas) (mas) (mas) (mas)
dX 18 ± 3 286 ± 56 −6606 ± 380 71 60
dY −83 ± 3 −510 ± 58 5024 ± 388 91 60

dX 12 ± 3 371 ± 31 36 ± 3 −22 ± 3 71 53
dY −70 ± 3 −61 ± 32 −37 ± 3 38 ± 3 91 55

dX 13 ± 3 338 ± 32 35 ± 3 −27 ± 3 −15 ± 3 −4 ± 3 71 52
dY −70 ± 3 −17 ± 33 −39 ± 3 44 ± 3 22 ± 3 18 ± 3 91 52

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