\begin{table}%T1
\caption{\label{tab:basicprprts}Basic properties of comet C/2004 Q2 (Machholz).}
\small%\centerline
{
\begin{tabular}{ll}
\hline\hline
\multicolumn{2}{c}{Comet C/2004 Q2 (Machholz)}\\
\hline
Discovery            & August 27, 2004\\
Earth passage    & $\Delta$~=~0.35~AU on January 5, 2005\\
Perihelion & $r_{\rm h}$~=~1.21~AU on January 25, 2005\\
Orbital period               & $\sim$117~000~year \\
Inclination & 38.6$^{\circ}$ with ecliptic\\
H$_2$O prod. rate & $2.6\times 10^{29}$~molec.~s$^{-1}$ at $\Delta$~=~0.394~AU ($\dag$)\\
\hline\end{tabular}}
\smallskip
 Refs.: Horizons On-Line Ephemeris System of JPL.\\
 (NASA) except $\dag$: \citet{bonev06}. 
\end{table}