\begin{table}%t1
\caption{Log-book of the \ngc2422 CCD observations.}
%\centering
\par
\begin{tabular}{ccc} 
\hline  \hline
\multicolumn{1}{c}{Filter}&  
\multicolumn{1}{c}{Exp. time} &
\multicolumn{1}{c}{Instrumental seeing} \\  
 & [s] & $FWHM$[$^{\prime\prime}$] \\
\hline
  {\it U} &   30 &  3.53 \\
  {\it B} &   15 &  3.24 \\
  {\it V} &   15 &  2.70 \\
  {\it R} &   15 &  2.63 \\
  {\it I} &   23 &  3.00 \\
  {\it I} &   10 &  2.99 \\
\hline
\end{tabular}
\label{obs}
\end{table}