\begin{table}%t6
%\centering
\par
\caption{\label {table_planet}Planetary parameters.}
\small \begin{tabular}{lll}
\hline \hline
    Parameter      & Value   &  Uncertainty   \\
\hline
Period (day)  &  0.853585 &$\pm$2.4~ 10$^{-5}$      \\   % TBC\
$a$ (AU)   &  0.0172   & $\pm$$2.9\times 10^{-4}$    \\  % TBC
$a$/\rstar  &   4.27  & $\pm$0.20   \\  % TBC
$T_{14}$ (h) & 1.125   &$\pm$0.05 \\ % TBC
impact parameter z & 0.61 &$\pm$0.06 \\
$k$ = $R_{\rm pl}$  / \rstar &   0.0187 &$\pm$$3\times 10^{-4}$\\  % TBC
$R_{\rm pl}$   / \RE & 1.68  &$\pm$0.09 \\
$M_{\rm pl}$ / \ME & $<$21  & \\
$i$ (deg) &   80.1  &$\pm$0.3   \\
\hline
\end{tabular} 
\end{table}