\begin{table}%T4
\caption{\label{Orbit_par}TWA22 B orbital parameters as determined from the fit of the
  astrometric data (see text for the definition of the parameters) with the reduced $\chi^{2}$ of the fit.}             
\small      
%\centering
\par
\begin{tabular}{l@{\hspace{1truecm}}l}     
\hline     \hline
\noalign{\smallskip}
Reduced $\chi^{2}$ & 1.127 \\
$a$ (AU)  & 1.77 $\pm$ 0.04  \\             
$e$  & $9.95 \times 10^{-2} \pm  0.32  \times 10^{-2}$ \\                
$i$ (degrees)  & 27.43 $\pm$ 4.40  \\    
$\Omega$ (degrees) & 134.95 $\pm$ 0.40 \\
$\omega$ (degrees)  & 100 $\pm$ 10 \\
$T_{{\rm p}}$ (years)  & 2006.039  $\pm$ 0.010 \\
$T$ (years)  & 5.15 $\pm$ 0.09\\
$M$ ($M_{\rm Jup}$) & 220 $\pm$ 21\\
\noalign{\smallskip}
\hline
\end{tabular}
\end{table}