\begin{table}%t2
%\centering
\par
\caption{\label{Par}Asteroid parameters.}
\small \begin{tabular}{lrrc}
\hline \hline 
 Asteroid  & $D({\rm km})$ & $albedo$ & Type \\
\hline 
160 Una        &  81 & 0.062 & CX \\
747 Winchester & 172 & 0.050 & PC \\
849 Ara        &  62 & 0.266 & M \\
\hline 
\end{tabular}
\end{table}