Table 3: Observed minus calculated statistics for four major Uranus satellites in 1995 and Pluto observations in 2003. For Uranus satellites reductions, we have $\overline {({\rm O{-}C})}_x$, $\overline {({\rm O{-}C})}_y$ and $(\sigma _x)$, $(\sigma _y)$ that are the means and the standard deviations for the residuals referred to Oberon satellite. The results $\overline {({\rm O{-}C})}_\alpha $, $\overline {({\rm O{-}C})}_\delta $ and $(\sigma _{\alpha })$, $(\sigma _{\delta })$ are for Pluto residuals topocentric coordinates (the units are arcseconds). $\overline {N}_{\rm obs}$ is the mean number of observations, and $\overline {N}_{\rm stars}$ the mean number of reference stars used in the astrometric calibration of Uranus and Pluto's system.
  Four major                             Pluto      
  Uranus' satellites        
$\overline {({\rm O{-}C})}_x$ $\overline {({\rm O{-}C})}_y$ $\overline {({\rm O{-}C})}_\alpha $ $\overline {({\rm O{-}C})}_\delta $ $\overline {N}_{\rm obs}$ $\overline {N}_{\rm stars}$
$(\sigma _x)$ $(\sigma _y)$ $(\sigma _{\alpha })$ $(\sigma _{\delta })$    
0 $\hbox{$.\!\!^{\prime\prime}$ }$006 0 $\hbox{$.\!\!^{\prime\prime}$ }$007 0 $\hbox{$.\!\!^{\prime\prime}$ }$043 -0 $\hbox{$.\!\!^{\prime\prime}$ }$012 743 37
(0 $\hbox{$.\!\!^{\prime\prime}$ }$047) (0 $\hbox{$.\!\!^{\prime\prime}$ }$055) (0 $\hbox{$.\!\!^{\prime\prime}$ }$030) (0 $\hbox{$.\!\!^{\prime\prime}$ }$019)    


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