\begin{table}%T1
\par
\caption{\label{tab:Hd_constant}Comparison between constants used for different determinations of the dynamical flattening ($H$): (1) the precession rate in longitude~($\psi_1$); (2) the speed of the general precession in longitude~($p_1$); (3) the geodesic precession~($p_g$); and~(4) the obliquity of the ecliptic at~J2000.0~($\epsilon_0$). The observational value actually used for each study is written in bold.}
\begin{tabular}{llllll}
\hline
\hline
\noalign{\smallskip}
                            &                  &  (1)              &   (2)           &  (3)      &  (4)                    \\
Sources                     &    ~$H$          & ~$\psi_1$         &  ~$p_1$         & ~$p_g$    & ~$\epsilon_0$           \\
                            & ($\times ~10^3$) & \multicolumn{3}{c}{(----------------------- in $''$/cy ---------------------)} & \\
\noalign{\smallskip}
\hline 
\noalign{\smallskip}
Lieske et~al.  (\cite{Lieske1977})         &                  &  5038.7784        & {\bf 5029.0966} & $-1.92$     &~$23^{\circ}26'21\farcs448$  \\
\noalign{\smallskip}
Kinoshita  (\cite{Kinoshita1977}) and Seidelmann  (1982)& 3.2739935&  5038.7784        & {\bf 5029.0966} & $-1.92$     &~$23^{\circ}26'21\farcs 448$  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
Williams  (\cite{Williams1994})              &  3.2737634       & {\bf 5038.456501} &  5028.7700      & $-1.9194 $  &~$23^{\circ}26'21\farcs409$  \\
\noalign{\smallskip}
Souchay \&  Kinoshita  (\cite{Souchay1996}) &  3.2737548       &  ~~~~~~~--         &  5028.7700      & $-1.9194$   &~$23^{\circ}26'21\farcs448$  \\
\noalign{\smallskip}
Bretagnon et~al. (\cite{Bretagnon1997})      &  3.2737671       & 5038.456488       &{\bf 5028.7700}  & $-1.919883$ &~$23^{\circ}26'21\farcs412$  \\
\noalign{\smallskip}
Bretagnon et~al.  (\cite{Bretagnon2003})      &  ~~~~~~--         & 5038.478750       &{\bf 5028.792262}& $-1.919883$ &~$23^{\circ}26'21\farcs40880$\\
\noalign{\smallskip}
Fukushima  (\cite{Fukushima2003})             &  3.2737804       & {\bf 5038.478143} &  5028.7955      & $-1.9196$	 &~$23^{\circ}26'21\farcs40955$\\
\noalign{\smallskip}
Capitaine et~al.  (\cite{Capitaine2003})      &  3.27379448      & {\bf 5038.481507} &  5028.796195    & $-1.919883$ &~$23^{\circ}26'21\farcs406$  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
Mathews et~al.  (\cite{Mathews2002})        &  3.27379492      & {\bf 5038.478750} &  5028.7923      & $-1.9198$	 &~$23^{\circ}26'21\farcs410$  \\
\hline
\end{tabular}
\end{table}