\begin{table}%t2
%\centering
\par
\caption{\label{tab:observations_wfi}Description of observations with WFI optical camera.}
\begin{tabular}{ccccc}
\hline\hline
Field & $\alpha$ & $\delta$ & $t_{\rm exp}$($I_{\rm c}$) & $I_{\rm c}$(5$\sigma$) \\ 
& ($^{\rm h}$~$^{\rm m}$~$^{\rm s}$) & ($^\circ$~$'$~$''$) & [min] & [mag] \\
    \hline
    1&08 40 04&+19 40 00& 24&22.6 \\
    2&08 42 24&+20 15 00& 30&23.3 \\
    3&08 40 04&+20 15 00& 36&23.2 \\
    4&08 37 44&+20 15 00& 24&23.4 \\
    5&08 37 44&+19 40 00& 36&23.6 \\
    6&08 37 44&+19 05 00& 36&23.1 \\
    7&08 40 04&+19 05 00& 36&23.5 \\
    8&08 42 24&+19 05 00& 36&22.8 \\
    9&08 42 24&+19 40 00& 36&22.8 \\
    \hline
  \end{tabular}
\end{table}