\begin{table}%t1
\caption{\label{tab1}The values of the simplified  $D$ criterion.}
%\centering
\small
\begin{tabular}{lccc}
\hline \hline
Asteroid &2002JS2&2002PD11&2003MT9\\
\hline
2002JS2&0.00&0.04&0.16\\
2002PD11&0.04&0.00&0.11\\
2003MT9&0.16&0.11&0.00\\
\hline
\end{tabular}
\end{table}