\begin{table}%t2
 \caption{Asteroid parameters.}
  \label{Par}
%\centering
\small
\begin{tabular}{lcrc}
\hline\hline
  Asteroid  & $D$(km) & albedo & Type \\
\hline
283 Emma        & 148 & 0.026 & X \\
665 Sabine      &  51 & 0.390 &   \\
690 Wratislavia & 135 & 0.076 & CPF \\
\hline
\end{tabular}
\end{table}