\begin{table}%t6
   \caption{Possible orbital solution for the velocity of HD~219542~B.}
     \label{t:planet_orbit}
%\centering
\par
       \begin{tabular}{lc}
         \hline
         \hline
         Parameter   &  Value \\
         \hline
Period (d) &  $112.1 \pm 1.2 $\\
Semi-amplitude (m s$^{-1}$) & $13.0\pm 3.0$\\
Eccentricity & $0.32 \pm 0.15$\\
Longitude of periastron (deg) & $51$ $\pm $ 33\\
Periastron passage (JD--2~450~000) & $ 1770.6 \pm 8.0 $ \\
 & \\
$a$ (AU) & 0.46 \\
$m \sin i$ & 0.30 \\
         \hline
      \end{tabular}
\end{table}