Table 2
Astrometry of individual CCD frames of WFI mosaics.
| Mean errors | No. of | No. ref. | ||
| TNOs | σ(Δαcosδ) | σ(Δδ) | frames | stars/frame |
| mas | mas | |||
|
|
||||
| Eris | 97 | 95 | 576 | 27 |
| Haumea | 51 | 50 | 784 | 8 |
| Ixion | 54 | 53 | 976 | 108 |
| Makemake | 48 | 51 | 800 | 7 |
| Orcus | 58 | 55 | 1528 | 14 |
| Quaoar | 57 | 57 | 904 | 121 |
| Sedna | 54 | 57 | 576 | 11 |
| Varuna | 49 | 53 | 848 | 31 |
| 2002 TX300 | 47 | 50 | 1184 | 20 |
| 2003 AZ84 | 50 | 50 | 1160 | 48 |
Notes. Mean errors are the standard deviations in the (O − C) residuals from individual (α,δ) solutions with the UCAC2 catalog, except for Eris in which case the 2MASS catalogue was used as the reference frame (see text for details). The six constant polynomial model was used to relate the (x,y) measurements to the (X,Y) tangent plane coordinates. The (x,y) centers were pre-corrected by the field distortion patterns (see details of these pre-corrections in Sect. 4.1 of P1).
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