Open Access
Table 4.
Weighted fits of the CIP coordinates dX for different precession models and IVS database.
| Precession | IVS | Model | A0 | A1 | A2 | As | Ac | WRMSpre | WRMSpost |
|---|---|---|---|---|---|---|---|---|---|
| μas | μas cy−1 | μas cy−2 | μas | μas | μas | μas | |||
| IAU 2006 | C04 | (i) | −11 ± 2 | 780 ± 12 | – | 20 ± 2 | 71 ± 2 | 179 | 126 |
| (ii) | −11 ± 2 | −61 ± 25 | 4570 ± 120 | 50 ± 2 | 71 ± 1 | 179 | 117 | ||
| OPA | (i) | 32 ± 3 | 621 ± 22 | – | 31 ± 2 | 82 ± 3 | 193 | 144 | |
| (ii) | 28 ± 3 | −188 ± 45 | 4788 ± 231 | −12 ± 3 | 75 ± 3 | 193 | 143 | ||
| IAU 2006J2 | C04 | (i) | −3 ± 2 | 264 ± 11 | – | 2 ± 1 | 68 ± 1 | 130 | 117 |
| (ii) | −3 ± 2 | −267 ± 25 | 15 ± 12 | 2 ± 2 | 68 ± 1 | 130 | 116 | ||
| OPA | (i) | 35 ± 3 | −358 ± 20 | – | 10 ± 2 | 71 ± 2 | 147 | 133 | |
| (ii) | 35 ± 3 | −418 ± 41 | 364 ± 21 | 8 ± 3 | 71 ± 2 | 147 | 133 | ||
Notes. The third column refers to the empirical functions in Eq. (3) to explain the observed feature of the residuals.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.