\begin{table}%t2
\caption{\label{Tab_Photometry}Photometry of comet 133P/Elst-Pizarro.}
%\centering
\par
\begin{tabular}{crrcccccc}
\hline\hline\noalign{\smallskip}
Date                            &
\multicolumn{1}{c}{Phase}       & 
\multicolumn{1}{c}{$r$\tablefootmark{(1)}}       &
\multicolumn{1}{c}{$\Delta$\tablefootmark{(2)}}  &
\multicolumn{3}{c}{$H_R$ $(\alpha)$ (mag)} &
\multicolumn{2}{c}{$H_V$ $(\alpha)$ (mag)} \\
(yyyy mm dd)                 &
\multicolumn{1}{c}{(\degr)}  &
\multicolumn{1}{c}{(AU)}     &
\multicolumn{1}{c}{(AU)}     &
acq.\tablefootmark{(3)}          &
aver. pol.\tablefootmark{(4)}    &
photom.\tablefootmark{(5)}      &
aver. pol.\tablefootmark{(4)}    &
photom.\tablefootmark{(5)}      \\
\hline
2007 05 22 & 19.69  & 2.6467 & 2.0129 & 16.69 &  16.76  &16.53 & 17.26 & 16.82  \\ 
2007 07 13 &  3.33  & 2.6424 & 1.6329 &       &  15.76  &15.62 & 16.11 & 15.94  \\ 
2007 07 17 &  1.66  & 2.6429 & 1.6282 & 15.57 &  15.75  &15.53 & 16.04 & 15.88  \\ 
2007 08 01 &  4.95  & 2.6455 & 1.6466 & 15.68 &  15.86  &15.65 & 16.22 & 16.13  \\ 
2007 08 05 &  6.68  & 2.6465 & 1.6619 & 15.91 &  15.69  &15.92 & 16.26 & 16.40  \\ 
2007 08 09 &  8.20  & 2.6475 & 1.2794 & 15.95 &  15.82  &15.91 & 16.27 & 16.35  \\ 
2007 08 30 & 15.32  & 2.6548 & 1.8342 &(16.19)& (16.34) &(16.51)&(16.33)&(16.82)\\ 
2007 09 19 & 19.61  & 2.6646 & 2.0521 & 16.46 &  16.25  &16.36 & 17.00 & 16.94  \\ 
2007 09 24 & 20.29  & 2.6674 & 2.1130 & 16.42 &         &16.74 & 16.63 & 17.22  \\ 
\hline
           & 0.00   &        &        &\multicolumn{3}{c}{$15.50 \pm 0.05$}&\multicolumn{2}{c}{$15.88 \pm 0.07$} \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{1}{Helio-centric distance to the object.}
\tablefoottext{2}{Geo-centric distance to the object.}
\tablefoottext{3}{Magnitude measured in the acquisition images.}
\tablefoottext{4}{Magnitude measured in the averaged polarimetric frames.}
\tablefoottext{5}{Magnitude measured in the frames obtained with no polarimetric optics in.}
The last row refers to the brighntess at phase-angle 0\degr\ extrapolated with a linear best-fit. Blanks refer to frames where the image of \centotrentatre\ was contaminated by background objects. Values given in parenthesis should be considered as lower limits because obtained during a
cloudy night.} 
\end{table}