Open Access
Table 1
Median values of position and proper-motion uncertainties for common stars and quasars.
| Type | N | Catalog | σα* (mas) | σδ (mas) | ![$\[\sigma_{\mu_{\alpha}^{*}}\]$](/articles/aa/full_html/2025/12/aa56271-25/aa56271-25-eq12.png) (mas yr−1) |
σμδ (mas yr−1) |
|---|---|---|---|---|---|---|
| QSOs | 1 385 405 | Gaia-CRF3 | 0.52 | 0.48 | 0.53 | 0.49 |
| CatWISE2020 | 62.7 | 65.9 | 20.8 | 22.0 | ||
| Stars | 404 033 704 | Gaia DR3 | 0.20 | 0.19 | 0.20 | 0.18 |
| CatWISE2020 | 82.5 | 85.2 | 26.3 | 27.6 | ||
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