\begin{table}%t1
%\centering
\par
\caption{\label{basic}Journal of observations.}
\begin{tabular}{llrr}
\hline\hline
Date &          Tel./instrument & Resolution & Exp. time  \\
\hline
\par
13/9/98     &   1.52/B \& C     &   15 \AA~  &  8 min \\
28/11/98    &   1.54/DFOSC      &   5 \AA~  & 30 min \\
\hline
\end{tabular}
\end{table}