\begin{table}%t2
%\centering
\par
\caption{\label{table:orbits}List of different orbits adopted in the simulations.}
\begin{tabular}{rccc}
\hline\hline 
Simulated orbit & $a$ & $e$ & $i$\\
(asteroid number) & (AU) &    & (deg)\\
\hline
15 & 2.643 & 0.187 & 11.7 \\
24 & 3.128 & 0.135 & 0.8\\
311 & 2.897 & 0.008 & 3.2\\
319 & 3.396 & 0.224 & 10.5\\
320 & 3.014 & 0.113 & 9.4\\
326 & 2.318 & 0.189 & 23.7\\
363 & 2.747 & 0.070 & 6.0\\
391 & 2.321 & 0.305 & 23.2\\
433 & 1.458 & 0.223 & 10.8\\
472 & 2.544 & 0.094 & 15.8\\
\hline
\end{tabular}
\end{table}