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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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