\begin{table}%t3
\caption{The model parameters.}
\label{Table_parameters}
%\centering
\par
\begin{tabular}{lcl}
\hline
\hline
Nucleus radius            &$r_{\rm n}$              &0.6 km\\
Nucleus rotation period   &$P$                &6 h\\
Nucleus density           &$\rho$             &1000 kg m$^{-3}$\\
Refractory grain density  &$\rho'$            &1000 kg m$^{-3}$\\
Bond albedo               &$A=p_{\rm v}q$     &0.04 $\times$ 0.28\\
Beaming factor            &$\eta$             &0.85\\
Thermal emissivity        &$\epsilon$         &0.95\\
Water ice recondensation  &$\alpha_{\rm R}$   &0.25\\
Solar constant            &$F_{{\rm sun}}$          &1370 W m$^{-2}$\\
Thermal inertia           &$I$                &0--20 J K$^{-1}~$m$^{-2}~$s$^{-1/2}$ \\
\hline
\end{tabular}
\end{table}