\begin{table}%t2
\caption{\label{table2}Log of observations.}
\small%\centering
\par
\begin{tabular}{lll}
\hline\hline 
Object (PN G) &  Obs. date & Exp. time (s) \\
\hline  
PB~8 (292.4+04.1) & May 9, 2006 & 5, 900, 600, 300  \\
NGC~2867 (278.1$-$05.9)& May 9, 2006 & 5, 900, 900  \\
PB~6 (278.8+4.9)& May 10, 2006 & 600, 900  \\
\hline  
\end{tabular} 
\end{table}