\begin{table}%t1
\caption{\label{obstab}Observation log and comet parameters.  Final column (Ap.) is the linear size of the
aperture projected on the comet. }
%\centering
\par
\begin{tabular}{lccccr}
\hline\hline\noalign{\smallskip}
Date \& &	$r$&	$\Delta$&		{\it Phase}&	Moon-& 	Ap. \\
time (UT)&  AU&AU&deg&set (UT)&kms\\
\noalign{\smallskip}\hline\noalign{\smallskip}
23/11/2001\\
   20:00 &	1.3458&	0.3758&		14.91&	19:38 	&	 7242 \\
   20:30 &	1.3455&	0.3756&		14.94&	      	&        7238 \\
   \\
24/11/2001\\
   21:00 &	1.3291&	0.3630&   	16.80&	20:30	& 	 6995 \\
   21:30 &	1.3287&	0.3627&		16.84&		&	 6990 \\
   \\
25/11/2001\\
   21:30 &	1.3126&	0.3517&		19.08&	21:20 	&	 6778 \\
   22:00 &	1.3123&	0.3515&		19.13&		&	 6774 \\
   \\
26/11/2001\\
   22:00 &	1.2962&	0.3418&		21.73&	22:12 	&   	 6587 \\
   22:30 &	1.2958&	0.3416&		21.79&		&	 6583 \\
   \\
16/03/2002\\
   23:30 &	1.2401&	1.2375&		47.36&	15:24 	&	23848 \\
\\
17/03/2002\\
   00:00 &	1.2404&	1.2374&		47.35&	16:14 	&	23846 \\
   23:30 &	1.2563&	1.2374&		47.03&		&	23846 \\
\\
18/03/2002\\
   00:00 &	1.2567&	1.2374&		47.03&	17:08 	&	23846 \\
\hline
\end{tabular}
\end{table}