\begin{table}%t2 
   %\centering
\par
   \caption{Geometrical and kinematical parameters of close
   encounters: {$\rho $} is minimum distance, $V_{\rm r}$ is relative velocity and
   {$\theta$} is angle of deflection of perturbed asteroid.}\label{tab2}
         \begin{tabular}{ccccc}
            \hline  \hline 
          Perturbed & Date   &$\rho$          & $V_{\rm r}$ & $\theta$  \\
          asteroid & year/m/d&[~${\rm AU}$]& [~${\rm km~ s^{-1}}$] & [~$\arcsec$~]\\
            \hline
  ~(3057) Malaren  &1983/1/19   &0.024345 & 1.66 & 0.74  \\
 ~~(5205) 1988CU7& 1977/5/12  &0.002922 & 3.73 & 1.22 \\
  ~(8331) Dawkins  &1988/1/19   &0.008044 & 1.48 & 2.80    \\
 (21225) 1995GQ1 &1981/1/12   &0.014061 & 1.66 & 1.28 \\
    \hline
   \end{tabular}
   \end{table}