\begin{table}%t1
\caption{Orbital elements: MPIfR comet observation campaign 2001--2004.
\label{obs_elem_table}}
%\centerline
{\begin{tabular}{lrrrr}
\hline \hline
 & &  \\[-3mm]
 Comet    & C/2001 A2-B & 153P     &  C/2001 Q4 &  C/2002 T7  \\[1mm]
          & (LINEAR)    & (Ikeya-Zhang) &  (NEAT)    &   (LINEAR) \\[1mm]
\hline 
 & &  \\[-3mm]
%Orb.~element set $^{a}$  & 2001-M48 & 2002-H05  &  2004-J69 &  2004-J05  \\
Orb.~element set $^{a}$ & 2001-M48 & 2002-H05
& 2004-J69 & 2004-J05  \\
Asc.~node $\Omega$ ($\circ$) & 295.12564 & 93.37048 & 210.27852  &  94.85882 \\
Arg.~perih.\ $\omega$ ($\circ$) &295.32853 & 93.37048 & 1.20653 & 157.73671 \\
Inclination $i$ ($\circ$)   &36.47538 & 28.12159  & 99.64258    & 160.658324  \\
Perih.~dist.\ $q$ (AU)    &0.7790280 & 0.5070583  & 0.9619575   & 0.6145967  \\
Eccentricity $e$     & 0.9993455 & 0.9899505   & 1.0007438     & 1.0005157  \\
Perih.~epoch     & 2001 May 24.52062 & 2002 Mar. 18.97927 
& 2004 May 15.96707 & 2004 Apr. 23.06172   \\
Osc.~epoch $^b$       & 2001 May 11.0 & 2002 Mar. 27.0
& 2004 May 8.0 & 2004 Jun. 4.0  \\
\hline 
\end{tabular}}
\par
\smallskip
$^a$ {Minor Planet Electronic Circular (MPEC) designation.}\\
$^b$ {Epoch of osculating elements.}
\end{table}