\begin{table}%t1
%\centering
\par
\caption{\label{tab:obs}Summary of the observations (including coordinates of the two  image centres).}
\small \begin{tabular}{lllll}
\hline\hline
 & East & & West & \\
\hline
RA (2000.0)  & 139.896093 &	& 139.354152 & \\
Dec (2000.0) & --12.2503 & & --12.25057  & \\
\hline
               & $B$     & $R$     & $B$     & $R$ \\
Exp. time (s)   & 1500  & 1200  & 1500  & 1200 \\
Airmass	        & 1.084 & 1.049 & 1.138 & 1.216 \\
Seeing (arcsec) & 0.90  & 1.15  & 0.95  & 0.90 \\
Gain (e-/ADU)   & 2999  & 2399  & 2999  & 2399 \\
Zero Point      & 24.486 & 24.334 & 24.486 & 24.334 \\
ZP error   & $\pm$0.009 & $\pm$0.005 & $\pm$0.009 & $\pm$0.005 \\
\hline
\end{tabular}
\end{table}