Table 2: 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.
\begin{displaymath}\begin{tabular}{lccc} \hline\hline night & $r_{\rm h}$ [AU]... ...5/26 & 12.78 & 12.97 & PG 1323--086 C \\ \hline \end{tabular} \end{displaymath}


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