All Figures

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f1.eps} \end{figure}$ Figure 1: Influence of the major planet disturbing stray light versus separation. It is given for the measures of the magnitude $H_{\rm dc}(1,0)-V(1,0)$ on Europa and Titan. The dashed line is a rough fit which shows a systematic error (the residual should normally be centred around zero). This stray light however does not affect the modulation of the signal, and hence the quantity $H_{\rm ac}$ is not corrupted.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f2.eps} \end{figure}$ Figure 2: Difference between the two magnitude estimators as a function of apparent diameter, for two particular cases of Minnaert's law and a spherical object seen at opposition.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f3.eps} \end{figure}$ Figure 3: Magnitude bias $\Delta H$ versus apparent diameter for Hipparcos observations of J2 Europa (top). Each point corresponds to a mean of successive transits of the planetary satellite across the field of view. The dispersion is a consequence of the variation of brightness with orbital phase. Dashed curves correspond to the bias for minimal and maximal brightness. The residuals (bottom) are calculated from light scattering following Minnaert's law with k=0.58. Each normal point is corrected for the effect of solar phase on the modulation function. The solid line is an independent empirical curve (see text). Filled circles correspond to observations at angular diameters larger than 0.87 $^{\prime \prime }$ .
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f4.eps} \end{figure}$ Figure 4: Magnitude bias $\Delta H$ for Hipparcos observations of S6 Titan (top). Each point corresponds a mean of successive transits of the planetary satellite across the field of view. The residuals (bottom) are calculated from light scattering following Minnaert's law with k=0.9, and corrected for the effect of solar phase on the modulation function.
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In the text

$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f2.eps} \end{figure}$	Figure 2: Difference between the two magnitude estimators as a function of apparent diameter, for two particular cases of Minnaert's law and a spherical object seen at opposition.
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$\begin{figure} \par\includegraphics[width=8.8cm,clip]{ms3432f4.eps} \end{figure}$	Figure 4: Magnitude bias $\Delta H$ for Hipparcos observations of S6 Titan (top). Each point corresponds a mean of successive transits of the planetary satellite across the field of view. The residuals (bottom) are calculated from light scattering following Minnaert's law with k=0.9, and corrected for the effect of solar phase on the modulation function.
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