\begin{table}%t2
%%%\centering
\par
\caption{Overview of $B$- and $R$-filter images used here. $r_{\rm h}$ and
$\Delta$ denote heliocentric and geocentric distances. The standard
star used for calibration of the comet images is quoted. The calibrations
were performed using the standard star from each field with color
indices similar to the solar colors.\label{bu}}
	$$
		\begin{tabular}{lccc}
			\hline\hline
			 night & $r_{\rm h}$ [AU] & $\Delta$ [AU] &
standard~star \\ \hline
			  2000.09.28/29 & 12.01 & 12.04 & SA98--682 \\
			  2000.09.29/30 & 12.02 & 12.06 & SA98--682 \\
			  2001.01.20/21 & 12.75 & 12.95 & SA95--105 \\
			  2001.01.25/26 & 12.78 & 12.97 & PG 1323--086
C \\ \hline
		\end{tabular}
	$$
\end{table}