\begin{table}%t1
%\centering
\par
\caption{\label{tab:f}Asteroids observed more than 20 times.}
\begin{tabular}{rlrlllllll}
\hline\hline \noalign{\smallskip}
Asteroid & $N$   & Asteroid &  $N$   &Asteroid & $N$   &Asteroid & $N$  & Asteroid &  $N$    \\
\hline
(1947)  &25     &  (63376)  &23     &(119651)   &21     &(153879)         &22 (21)&2005 RF$_{47}$    &21     \\
   (8914)  &24     &  (65200)  &23     &(124135)   &28 (26)&(153937)         &22     &2005 SF$_{286}$   &21     \\
  (12104)  &24     &  (68480)  &23     &(125136)   &22 (21)&(156751)         &22     &2005 SS$_{287}$   &21     \\
  (32257)  &21 (20)&  (79530)  &22     &(125779)   &24     &(160318)         &22 (21)&2005 UV$_{108}$   &21 (19)\\
  (35774)  &21 (20)&  (88005)  &22     &(128018)   &22     &(214479)         &22     &2005 UC$_{130}$   &23     \\
  (39132)  &23     &  (89891)  &21     &(128343)   &24 (23)&(215187)         &23 (21)&2005 UO$_{213}$   &23     \\
  (42306)  &24 (22)& (101812)  &21     &(148844)   &21 (20)&(219686)         &21 (20)&2005 UU$_{396}$   &23     \\
  (57252)  &21 (19)& (106590)  &23     &(149182)   &25     &(221267)         &21     &2005 VR$_{131}$   &24 (23)\\
  (58673)  &22 (21)& (110634)  &22     &(151057)   &21     &(225873)         &21     &2005 VS$_{131}$   &22     \\
  (62781)  &21     & (110755)  &24 (23)&(153695)   &21 (20)&1992 WW$_{6}$    &23     &2007 EP$_{39}$    &23     \\
  (63029)  &22     & (119574)  &23     &(153822)   &22     &2003 GG$_{51}$   &22 (19)&                  &       \\
\hline
\end{tabular}
\tablefoot{The number of observations within a single apparition is in parenthesis.}
\end{table}