\begin{table}%t1
  \caption{\label{tab:45P}Orbital elements and physical parameters of comet 45P/Honda-Mrkos-Pajdusakova.
$[Af\rho]$ and $r_n$ are taken from \cite{Lamy.et.al99}, $q$ from Rocher (see: 
{\tt http://www.imcce.fr/en/ephemerides/donnees/comets/FICH/CIA0028.php}),
$Q_{\rm H_2O}(q)$ from \cite{Ahearn.et.al95},
and $f$ is computed from \citet[][ Appendix~A, Eq.~(9)]{CrifoRodionov97}, while~$s$ is assumed.}
\small%\centering
\par
\begin{tabular}[htbp]{ccc}
\hline \hline 
Symbol & Name & Value \\
\hline
$T$	& epoch    (JD) & 2~453~833.5\\
$a$	& semi-major axis & 3.0227318819~AU\\
$e$	& excentricity 	   & 0.8245702722\\
$i$	& inclination  	   & 4.2533061566 $(^\circ)$\\
$ \Omega $ & Long. of Asc. Node   & 89.114123791 $(^\circ)$\\
$ \omega $ & arg. of perihelion   & 326.10832699 $(^\circ)$\\
\hline
$r_n$   &  radius of nucleus & 0.34~km \\
$q$ & perihelion distance & $ 0.529~ {\rm AU}$        \\
$[Af\rho]$&$[Af\rho]$ at 0.97~AU from the Sun& $ 3.7 ~ {\rm cm}$\\
$Q_{\rm H_2O}$ & gas production rate at perihelion& $4.07~ \times $ $ 10^{27} \: {\rm mol. 
s^{-1}}$  \\
$f$ & fraction of active area  at perihelion& $0.2$    \\
$s$ & diff. size population index & 2.5\\
\hline
\end{tabular}
 \end{table}