\begin{table}%t1
%\centering
\par
\caption{\label{sys_par}System parameters of the binary system PSR~B1259$-$63/SS2883 \citep{tavani&arons}.}
\begin{tabular}{cc}
\hline\hline
\textbf{Parameter} & \textbf{Value} \\
\hline
Distance, $D~[\mbox{kpc}]$ & 1.5 \\ 
Eccentricity, $e$ & 0.87 \\
Orbital Period, $P_{\rm orb}$[d]    &  1273 \\
Last Periastron Passage &  2007-07-27\\
%\hline
%Compact Object &\\
\noalign{\smallskip}
\multicolumn{2}{c}{\textbf{Compact Object}}\\
\noalign{\smallskip}
%\hline
Pulsar Period, $P  \left[\mbox{ms}\right]$ & 47.7  \\
$\dot{P}=\frac{{\rm d}P}{{\rm d}t} \left[\frac{\mbox{s}}{\mbox{s}}\right]$ & $2.27579\times 10^{-15}$\\
Spin-down age, $\tau \left[\mbox{yr}\right]$ & $3\times 10^5$ \\
Spin-down luminosity, $L_{p} \left[\mbox{erg}~\mbox{s}^{-1}\right]$ & $8\times 10^{35}$ \\
Magnetic field, $B\left[\mbox{G}\right]$ & $3\times 10^{11}$ \\ 
%\hline
%Companion Star    & B2Ve  \\
%\hline
\noalign{\smallskip}
\multicolumn{2}{c}{\textbf{Companion Star (B2Ve)}}\\
\noalign{\smallskip}
Temperature $\left[\mbox{K}\right]$ & $~10^4$ \\
Mass $\left[M_{\odot}\right]$ & $~10$ \\
\hline
\par
\end{tabular}
\end{table}