\begin{table}%t2
%\centering
\par
\caption{NG~parameters derived from positional observations for
assumed function $h(r)$ (Eq.~(5)) represented by: standard function
$g$($r$), $g^*$($r$) -- modified function $g$($r$), $g_{\rm{S}}$($r$)
-- Sekanina's function, $f$($r$) -- Yabushita's function describing
CO sublimation, respectively. NG~parameters~$A^*_{\rm{1}},
A^*_{\rm{2}}, A^*_{\rm{3}}$ are given in units of
$10^{-8}$~AU~day$^{-2}$; these parameters are the standard~$A_{\rm{1}}, A_{\rm{2}}$ and $A_{\rm{3}}$ for the NG~models
including the standard $g$($r$); $\tau$ is given in days. First line
for each individual comet shows the NG~parameters $A_{\rm{1}}$ and
$A_{\rm{2}}$ taken from MW Catalogue or Minor Planet Circulars (if
there are). The $g^*$($r$) functions for C/1995~O1~Hale-Bopp
($g^*_{\rm{HB}}$($r$)) and C/1996~B2~Hyakutake
($g^*_{\rm{Hya}}$($r$)) are described in Table~3. For comet
C/1959~Y1~Burnham the models with displacement, $D$, of
photometric centre from the gravitational one are also presented;
the values of this displacement (in paranthesis) are given in
units of $10^{-5}$~AU. Models with subscript $^R$ indicate
solutions based on 37 observations of Comet~Burnham made by Roemer
et~al. (1966).\label{tab2}}
 {
\begin{tabular}{llccccc} \hline\hline
Name     &
$h(r)$           & $A^*_{\rm{1}}$                & $A^*_{\rm{2}}$                 & $A^*_{\rm{3}}$               & $\tau$            & {rms} \\
&&&&& [$D$] & \\
\hline
1996 B2 &
$g$($r$)$_{\rm{Mar}}$   & $+2.76$              &  $+0.0716$            &                     &                 &            \\
 & $g$($r$)        & $+2.7699\pm .1793$   &  $+0.1396\pm .0090$   & $+0.6602\pm .0678$  &                 & 1\farcs 08 \\
 & $g$($r$)        & $+4.0727\pm .0776$   &  $-0.3590\pm .0366$   & $-0.9748\pm .0500$  & $1.834\pm .095$ & 0\farcs 98 \\
 & $g_{\rm{S}}$($r$)    & $+2.0592\pm .0532$   &  $+0.1322\pm .0087$   & $-0.5466\pm .0608$  &                 & 1\farcs 06 \\
 & $g_{\rm{S}}$($r$)    & $+3.6962\pm .0705$   &  $-0.3319\pm .0358$   & $-0.7876\pm .0452$  & $1.862\pm .103$ & 0\farcs 97 \\
 & $f$($r$)        & $+2.0630\pm .1793$   &  $+0.1078\pm .0070$   & $-0.4160\pm .0483$  &                 & 1\farcs 05 \\
 & $f$($r$)        & $+2.9400\pm .0559$   &  $-0.2651\pm .0288$   & $-0.6080\pm .0366$  & $1.896\pm .105$ & 0\farcs 97 \\
 & $g_{\rm{Hya}}^*$($r$)& $+0.6216\pm .0103$ &  $+0.0704\pm .0032$   & $-0.0034\pm .0129$  &                 & 0\farcs 97 \\
 & $g_{\rm{Hya}}^*$($r$)& $+0.8538\pm .1759$ &  $-0.0686\pm .0117$   & $-0.0330\pm .0111$  & $2.936\pm .174$ & 0\farcs 92 \\
 & $g$($r$)$_{r_{\rm {0}}=4~ {\rm{AU}}}$& $+2.7889\pm .0585$ &  $+0.1383\pm .0091$   & $-0.6442\pm .0660$  &                 & 1\farcs 07 \\
%&&&&&& \\
1959 Y1 &
$g$($r$)$_{\rm{Mar}}$~$^R$   & $+5.9$          &  $-1.4   $            &                     &                 &            \\
 & $g$($r$)        & $+5.3028\pm .4385$   &  $-0.6879\pm .3349$   & $+0.1774\pm .1238$  &                 & 1\farcs 64 \\
 & $g$($r$)        & $+5.1843\pm .4191$   &  $+0.2103\pm .3950$   & $+0.2932\pm .1218$  &[$.5606\pm .1453$]&1\farcs 56 \\
 & $g$($r$)        & $+9.661 \pm 1.314$   &  $+1.3142\pm .5776$   & $+0.7462\pm .2012$  & $-9.37 \pm 1.51$& 1\farcs 59 \\
 & $g_{\rm{S}}$($r$)    & $+4.8533\pm .3975$   &  $-0.6092\pm .3170$   & $+0.1449\pm .1183$  &                 & 1\farcs 64 \\
 & $g_{\rm{S}}$($r$)    & $+8.678 \pm 1.111$   &  $+1.2406\pm .5467$   & $+0.6558\pm .1882$  & $-9.61 \pm 1.62$& 1\farcs 59 \\
 & $f$($r$)        & $+3.8495\pm .3156$   &  $-0.4864\pm .2511$   & $+0.1147\pm .0936$  &                 & 1\farcs 64 \\
 & $f$($r$)        & $+6.8991\pm .8843$   &  $+0.9821\pm .4330$   & $+0.5221\pm .1492$  & $-9.60 \pm 1.61$& 1\farcs 59 \\
 & $g$($r$)~$^R$   & $+5.5372\pm .4688$   &  $-1.1247\pm .4190$   & $+0.0400\pm .1503$  &                 & 1\farcs 46 \\
 & $g$($r$)~$^R$   & $+5.3533\pm .3590$   &  $+0.5632\pm .4027$   & $+0.2872\pm .1204$  &[$.8467\pm .1229$]&1\farcs 12 \\
 & $g$($r$)~$^R$   & $+10.688\pm 1.273$   &  $+1.6942\pm .6389$   & $+0.8080\pm .2791$  & $-10.54\pm 1.36$& 1\farcs 37 \\
%&&&&&& \\
1969 Y1 &
$g$($r$)$_{\rm{Mar}}$   & $+1.9$               &  $+0.1   $            &                     &                 &            \\
 & $g$($r$)        & $+1.6024\pm .1793$   &  $+0.1634\pm .1462$   & $-0.0988\pm .2059$  &                 & 1\farcs 53 \\
 & $g$($r$)        & $+1.6668\pm .1426$   &  $+0.5054\pm .1426$   & $+0.3811\pm .1950$  & $+6.23\pm 1.66$ & 1\farcs 53 \\
 & $g_{\rm{S}}$($r$)    & $+1.6070\pm .1668$   &  $+0.2178\pm .1210$   & $+0.0253\pm .1783$  &                 & 1\farcs 53 \\
 & $g_{\rm{S}}$($r$)    & $+1.6074\pm .1339$   &  $+0.4563\pm .1194$   & $+0.3607\pm .1680$  & $+5.96\pm 1.69$ & 1\farcs 53 \\
 & $f$($r$)        & $+1.2698\pm .1321$   &  $+0.1709\pm .0959$   & $+0.0169\pm .1413$  &                 & 1\farcs 53 \\
 & $f$($r$)        & $+1.2700\pm .1057$   &  $+0.3598\pm .0944$   & $+0.2823\pm .1326$  & $+5.94\pm 1.69$ & 1\farcs 53 \\
%&&&&&& \\
1999 H1 &
$g$($r$)$_{\rm{Mar}}$   & --              &  --                &                     &                 &            \\
 & $g$($r$)        & $+0.8918\pm .0947$   &  $-0.2087\pm .0146$   & $-0.2083\pm .0071$  &                 & 0\farcs 69 \\
 & $g_{\rm{S}}$($r$)    & $+0.7146\pm .0785$   &  $-0.2034\pm .0140$   & $+0.2021\pm .0063$  &                 & 0\farcs 69 \\
 & $f$($r$)        & $+0.5706\pm .0626$   &  $-016069\pm .0111$   & $+0.1597\pm .0050$  &                 & 0\farcs 69 \\
 & $g$($r$)$_{r_{\rm {0}}=1.5~ {\rm{AU}}}$& $+2.7489\pm .2280$ &  $-0.0203\pm .0129$   & $+0.0258\pm .0136$&                 & 0\farcs 68 \\
% &&&&&& \\
1991 T2 &
$g$($r$)$_{\rm{Mar}}$   & --               &  --                &                     &                 &            \\
 & $g^*$($r$) m~=~--2.0     & $+2.5159\pm .5235$&  $-2.4769\pm .4059$   & $+1.4182\pm .3125$  &            & 1\farcs 14 \\
 & $g^*$($r$) m~=~--2.0,~k~=~0 & $+1.9299\pm .4339$&  $-1.4349\pm .2211$   & $+0.7013\pm .1754$  &            & 1\farcs 13 \\
 & $g_{\rm{S}}$($r$)    & $+2.4729\pm .4927$   &  $-1.9988\pm .2951$   & $+1.0648\pm .2298$  &                 & 1\farcs 13 \\
 &  $f$($r$)       & $+1.9137\pm .3845$   &  $-1.5436\pm .2277$   & $+0.8118\pm .1776$  &                 & 1\farcs 13 \\
 & $g$($r$)$_{r_{\rm {0}}=4~ {\rm{AU}}}$& $+2.8834\pm .5592$ &  $-2.3946\pm .3535$   & $+1.3214\pm .2744$  &                 & 1\farcs 13 \\
1993 Y1 &
$g$($r$)$_{\rm{Mar}}$   & $+1.77$              &  $+0.646 $            &                     &                 &            \\
 & $g$($r$)        & $+1.4777\pm .1354$   &  $-0.0204\pm .0792$   & $-0.1103\pm .0532$  &                 & 1\farcs 00 \\
 & $g_{\rm{S}}$($r$)    & $+1.4038\pm .1197$   &  $-0.0029\pm .0657$   & $-0.0803\pm .0449$  &                 & 1\farcs 00 \\
 & $f$($r$)        & $+1.0880\pm .0955$   &  $-0.0066\pm .0542$   & $-0.0725\pm .0370$  &                 & 1\farcs 00 \\
%&&&&&& \\
1995 O1 &
$g$($r$)$_{\rm{Mar}}$   & $+1.27$              &  $+0.1144$            &                     &                 &            \\
 & $g$($r$)        & $+1.520 \pm .031 $   &  $+0.1199\pm .0053$   & $-0.0198\pm .0117$  &                 & 1\farcs 07 \\
 & $g$($r$)        & $+1.599 \pm .033 $   &  $-0.0425\pm .0301$   & $-0.0361\pm .0109$  & $ 8.23 \pm 1.46$& 1\farcs 06 \\
 & $g_{\rm{S}}$($r$)    & $+1.4497\pm .0339$   &  $+0.1144\pm .0052$   & $-0.0233\pm .0107$  &                 & 1\farcs 10 \\
 & $g_{\rm{S}}$($r$)    & $+1.5044\pm .0367$   &  $+0.0355\pm .0218$   & $-0.0325\pm .0103$  & $4.22 \pm 1.13$ & 1\farcs 09 \\
 & $f$($r$)        & $+1.147 \pm .027 $   &  $+0.0912\pm .0043$   & $-0.0190\pm .0086$  &                 & 1\farcs 10 \\
 & $f$($r$)        & $+1.1845\pm .0297$   &  $+0.0384\pm .0171$   & $-0.0253\pm .0083$  & $3.55 \pm 1.11$ & 1\farcs 10 \\
 \hline
\end{tabular}
}
%\end{table}