\begin{table}%t1
\caption{\label{Obs Log}Log of the observations. Time is given in UT.}
\small%\centering
\par
\begin{tabular}{clcccc}
\hline
\hline
\noalign{\smallskip}
Data set & Date & \multicolumn{2}{c}{Observation} & \multicolumn{2}{c}{Transit}  \\
         &      & start & end & start & end  \\ 
\hline
Transit \#1 & 2007-06-10     & 02:04:52 & 07:35:03 & 03:36:59 & 05:24:28 \\
Transit \#2 & 2007-06-18/19  & 22:43:24 & 04:12:45 & 00:35:58 & 02:23:27 \\
Transit \#3 & 2008-04-24     & 14:01:12 & 17:53:22 & 15:00:29 & 16:47:58 \\ 
\hline
\end{tabular}  
\end{table}