\begin{table}%t2
%\centering
\par
\caption{\label{TabPointing}\textit{Planck} pointing performance.}
\begin{tabular}{l  c  c }  
\hline \hline \noalign{\smallskip} 
Small manoeuver accuracy    & $<$0.4~arcmin  & 1$\sigma$  \\
Residual nutation after manoeuver    & $<$0.85~arcmin  & 1$\sigma$  \\
Drift during inertial pointing & 2.5--3.5~arcmin/24~h & due to solar radiation pressure \\
Accuracy of on-ground determination of star tracker frame    & $<$0.07~arcmin  & 1$\sigma$, at 8~Hz\\
Star-tracker to detector bias determination accuracy & $\sim$5 arcsec & 1$\sigma$, based on simulations of planet obervations  \\
\hline  
\end{tabular}
\vspace{-2mm}\end{table}