\begin{table}%t6
\caption{Determination of absolute magnitude from photometric data of C/1999 R1 (SOHO).}\label{tab4}
%\centering
\par
\begin{tabular}{c c c c c c c}
\hline\hline
Magnitude & \multicolumn{2}{c}{Distance} & Phase angle& & \multicolumn{2}{c}{Absolute magnitude} \\
$m$ [mag] & $r$ (helioc.) [AU] & $d$ (geoc.) [AU]& $\phi$ [deg] & & cometary $H_{\rm C}$ [mag] & asteroidal $H_{\rm MP}$ [mag]\\ \hline
 6.6 & 0.0577& 0.9978& 116.9 & & 12.84 & 12.84 \\
 6.5 & 0.0573& 0.9833& 110.9 & & 12.75 & 12.75 \\
 6.4 & 0.0572& 0.9870& 106.6 & & 12.64 & 12.64 \\
 6.3 & 0.0573& 0.9907& 102.3 & & 12.53 & 12.53 \\
 6.2 & 0.0575& 0.9945& 98.1 & & 12.41 & 12.41 \\
 6.2 & 0.0580& 0.9993& 93.3 & & 12.38 & 12.38 \\
 6.4 & 0.0592& 1.0071& 85.9 & & 12.52 & 12.52 \\
 6.4 & 0.0600& 1.0109& 82.1 & & 12.49 & 12.49 \\
 6.7 & 0.0609& 1.0148& 78.4 & & 12.75 & 12.75 \\
 6.9 & 0.0619& 1.0186& 74.9 & & 12.90 & 12.90 \\
 6.9 & 0.0645& 1.0272& 68.2 & & 12.79 & 12.80 \\
 7.4 & 0.0676& 1.0355& 62.2 & & 13.17 & 13.20 \\
 7.4 & 0.0706& 1.0427& 67.7 & & 13.07 & 13.11 \\ \hline
\end{tabular}
\end{table}