\begin{table}%t1
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\par
%\begin{minipage}[t]{\linewidth}
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\caption{\label{tab1}Log of the observations\tablefootmark{a}.}  
    \begin{tabular}{c c c c c c c c c c c }     
\hline\hline                  
Date &Days to& $\Delta$&$R_{\rm S}$&$m_{\rm v}$&Alpha&Sun-C &Telescope&$D$&Filters &Exposure\\ 
2008--2009&perihelion&(AU)&(AU)& &($^{\circ}$)& PA ($^{\circ}$)& &( km px$^{-1}$)& &time\\
\hline                    
December& & & & & & & & & & \\
25.60&--65&1.67&1.45&14.2&35.75&70.5& &370&CR&180~s\\
26.62&--64&1.67&1.46&14.2&35.75&70.5&IGO&373&CR&120~s $\times$ 2\\
27.59&--63&1.67&1.46&14.2&35.8&70.4&(India)&373&CB&240~s $\times$ 2\\
27.61&--63&1.67&1.46&14.2&35.8&70.3&2~m&373&CR&180~s $\times$ 2\\
27.63&--63&1.67&1.46&14.2&35.8&70.3& & 373&$R_{\rm b}$ &60~s $\times$ 2\\
March& & & & & & & & & & \\
17.81&+17&1.72&1.26&13.5&34.7&69.9&OHP& 1051&$R$&20~s $\times$ 9\\
18.78&+18&1.72&1.265&13.5&34.7&70.0&(France)&1057&R&20~s $\times$ 18\\
19.80&+19&1.73&1.27&13.5&34.6&70.2&0.8m&1057&$R$&20~s $\times$ 21\\
April--May& & & & & & & & & & \\
30.60&+61&1.99&1.44&14.5&28.9&82.3&IGO&445&$R$$_{\rm b}$&360~s\\
01.70&+62&2.00&1.45&14.5&28.7&82.7&2~m&445&$R$$_{\rm b}$&600~s\\                    
\hline             
\end{tabular}
\tablefoot{\tablefoottext{a}{$\Delta$ =  Earth-comet distance; $R_{\rm S}$ = Sun-comet distance; $m_{\rm v}$ = expected magnitudes given by the JPL Horizons system ephemeris; $\alpha$ = phase angle; Sun-C PA = extended Sun-comet radius vector position angle; $D$ = projected diameter for 1 pixel; filters: CR = narrow cometary red filter, CB = narrow cometary blue filter, $R_{\rm b}$ = broad red filter centered on 620~nm, $R$ = broad red filter centered on 650~nm (see Sect.~2.1). Exposure time for each polarized component image $\times$ number of images used for the results.}}
%\end{minipage}
\end{table}