\begin{table}%t1
%\centering
\par
\caption{\label{table1} Geometrical configurations of the observations.}
\begin{tabular}{c c c c }
\hline\hline
Night        & $R$ (AU)  & $\Delta$ (AU) & Phase angle       \\
\hline
May 24 2007  & 3.10    &  2.10         &   2.78$^{\circ}$     \\
Jun. 26 2007  & 3.27    &  2.36         &   9.19$^{\circ}$     \\
\hline
\end{tabular}
\end{table}