\begin{table}%t2
\caption{\label{tab_oss}The observation log for each night and the limits of the
field of view at the 3 different observatories.}
\small
%\centering
\par
\begin{tabular}{c|cc|cc|cc}
\hline \hline
 &
 \multicolumn{2}{|c|}{Loiano}   &
 \multicolumn{2}{|c|}{SPM}    &
 \multicolumn{2}{|c}{CFHT} \\
 Night     & $t_{\rm start}$      & $t_{\rm end}$  & $t_{\rm start}$      & $t_{\rm end}$  & $t_{\rm start}$      & $t_{\rm end}$ \\ &
 \multicolumn{2}{|c|}{ (HJD-2~452~400)}   &
 \multicolumn{2}{|c|}{ (HJD-2~452~400)}   &
 \multicolumn{2}{|c} { (HJD-2~452~400)}   \\
\hline
1{st}  &       &	   &       &       & 59.82 & 59.96 \\
2{nd}  &       &	   &       &       & 60.83 & 61.02 \\
3{rd}  & 62.48 & 62.63 & 61.68 & 61.95 & 61.94 & 62.07 \\
4{th}  & 63.41 & 63.63 & 62.68 & 62.96 & 62.76 & 63.07 \\
5{th}  & 64.38 & 64.64 & 63.68 & 63.96 & 63.88 & 64.10 \\
6{th}  & 65.39 & 65.62 & 64.69 & 64.98 & 64.77 & 65.11 \\
7{th}  &       &	   & 65.70 & 65.82 &       &       \\
8{th}  &       &	   & 66.69 & 66.97 &       &       \\
9{th}  &       &	   & 67.67 & 67.98 & 67.77 & 68.10 \\
10{th} &       &       & 68.69 & 68.87 & 68.76 & 69.11 \\
\hline
$\alpha_{\rm min}$ & \multicolumn{2}{|l|}{$ \rm 19^h 20^m 25\fs8$}            & \multicolumn{2}{|l|}{$\rm 19^h  20^m 36\fs3$}             & \multicolumn{2}{|l}{$\rm 19^h  19^m 23\fs7$} \\
$\alpha_{\rm max}$ & \multicolumn{2}{|l|}{$\rm 19^h 21^m 30\fs4$}            & \multicolumn{2}{|l|}{$\rm 19^h 21^m 10\fs4$}             & \multicolumn{2}{|l}{$\rm 19^h 22^m 58\fs0$}    \\
$\delta_{\rm min}$ & \multicolumn{2}{|l|}{$37^\circ 41\arcmin 22\farcs6$}  & \multicolumn{2}{|l|}{$37^\circ 43\arcmin 15\farcs4$}   & \multicolumn{2}{|l}{$37^\circ 36\arcmin 6\farcs7$}    \\
$\delta_{\rm max}$ & \multicolumn{2}{|l|}{$37^\circ 53\arcmin 42\farcs7$}  & \multicolumn{2}{|l|}{$37^\circ 50\arcmin  3\farcs1$}   & \multicolumn{2}{|l}{$38^\circ 4\arcmin 21\farcs2$}    \\
\hline
\end{tabular}
\end{table}