Table 11
Comparison between WFI-based and actual observed occultations: central instants and C/As.
| Star | Prediction minus Occultation | ||||
| TNO | mag (R) | Central instant | C/A | ||
| s | mas | mas | km | ||
|
|
|||||
| 2002 TX300 | 12.9 | −15 | −13 | −09 | −265 |
| Varuna | 11.0 | −20 | −12 | −63 | −1953 |
| Eris | 16.9 | −604 | −229 | + 39 | + 2708 |
| 2003 AZ84 | 18.2 | + 0 | + 0 | + 0 | + 0 |
| Makemake | 18.4 | + 196 | + 116 | + 40 | + 1494 |
| Quaoar | 15.7 | + 130 | + 78 | −44 | −1351 |
| average (moduli) | 193 | 90 | 39 | 1554 | |
| average (Eris out) | 90 | 55 | 39 | 1266 | |
Notes. Comparison between central instants and C/As from WFI-based (Table 8) and actual observations (fit to data) for 6 (out of seven) successfully recorded TNO stellar occultations to date for which data is available. Using P/A, distance and the relative speed, central instant differences are expressed in seconds and in mas, and C/A differences in mas and in km. Averages for the modulus of the differences are computed with and without Eris. 2003 AZ84 is excluded from the analysis as the fit to the actual occultation already uses the WFI star position, and the current WFI predictions already uses the offsets derived from the occultation fitting.
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