All Figures

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{1339fig1.eps} \end{figure}$ Figure 1: Comparison of different forms of the NG function h(r) (Eq. (5)) vs. heliocentric distance. Dotted-dashed curves marked as $g^*_{\rm {HB}}$ (r) and $g^*_{\rm {Hya}}$ (r) represent g(r)-like functions (Table 3) determined from the photometric observations for Comet C/1995 O1 Hale-Bopp and C/1996 B2 Hyakutake, respectively.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{1339fig2.eps} \end{figure}$ Figure 2: The NG standard parameter $A=\sqrt { (A_1)^2+(A_{\rm {2}})^2+(A_{\rm {3}})^2}$ vs. the perihelion distance (upper panel) and reciprocals of original semimajor axis $1/a_{\rm {ori}}$ (middle) for the sample of 19 long-period comets. C/1991 T2 and C/1995 Y1 are shown by open circles; for these comets NG parameters A^* based on g(r)-like form are given (see Table 2). The A^* determined for the model with g(r) $_{r_{\rm {0}}\ne 2.808~{\rm AU}}$ (see Table 2) are given by open pentagons in the upper panel. In the bottom panel the perihelion distances vs. $1/a_{\rm {ori}}$ for 19 comets are shown.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{1339fig3.eps} \end{figure}$ Figure 3: Maximum of NG forces $F_{\rm {NG,max}}=A^*\cdot h$ (r=q) (given in units of cm s^-2) vs. perihelion distance q derived for the investigated long-period comets. Circles, squares and triangles show maksimum values of NG-forces for the standard g(r)-function, $g_{\rm {S}}$ (r) and f(r), respectively. The asterisks represent the $g^*_{\rm {Hya}}$ and $g^*_{\rm {HB}}$ models, for C/1996 B2 and C/1995 O1. The dotted curves represent the 10^-3, 10^-4, 10^-5 of the solar gravitational acceleration $F_{\odot }(r)$ , respectively.
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In the text

$\begin{figure} \par\includegraphics[width=8.4cm,clip]{1339fig1.eps} \end{figure}$	Figure 1: Comparison of different forms of the NG function h(r) (Eq. (5)) vs. heliocentric distance. Dotted-dashed curves marked as $g^_{\rm {HB}}$ (r) and $g^_{\rm {Hya}}$ (r) represent g(r)-like functions (Table 3) determined from the photometric observations for Comet C/1995 O1 Hale-Bopp and C/1996 B2 Hyakutake, respectively.
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