\begin{table}%t2
\caption{Journal of photometric observations.}
\label{journal_phot_obs}
%\centering
\small
\begin{tabular}{llll}
\hline
\hline
Filter & Obs./Tel. & Date & Exposure (s)  \\
\hline
$U$ & SPM 1.5 m & 2000 Mar. 10 & $3 \times 300$                              \\
    & SPM 1.5 m & 2000 Mar. 14 & $1 \times 300$                              \\
$B$ & SPM 1.5 m & 2000 Mar. 10 & $2 \times 300 + 1 \times 100$               \\
    & SPM 1.5 m & 2000 Mar. 14 & $1 \times 300 + 1 \times 200$               \\
    & OPD 0.6 m & 2005 Apr. 10 & $5 \times 240 + 5 \times 120$               \\
$V$ & SPM 1.5 m & 2000 Mar. 10 & $1 \times 60 + 1 \times 30 + 1 \times 20$   \\
    & SPM 1.5 m & 2000 Mar. 14 & $1 \times 30$                               \\
    & OPD 0.6 m & 2005 Apr. 10 & $5 \times 45 + 7 \times 35 + 5 \times 25$   \\
 H$\alpha$ & SPM 1.5 m & 2000 Mar. 15 & $5 \times 300$ \\ 
 Cont.     & SPM 1.5 m & 2000 Mar. 15 & $4 \times 60$  \\
\hline
\end{tabular}
\end{table}