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$\begin{figure} \par\includegraphics[width=6cm]{5451fig1.eps}\hspace*{1.5cm} \includegraphics[width=6cm]{5451fig2.eps} \end{figure}$ Figure 1: Residual signal strength D_a in percent (see Eq. (64)) as a function of spin vector components (s_P,s_Q) in the orbital plane. Left panel for obliquity $\gamma$ smaller than $90^\circ$ ( $s_k\geq 0$ ), right panel for obliquity larger than $90^\circ$ ( $s_k\leq 0$ ). Orbital semimajor axis and physical parameters as of the asteroid (1566) Icarus: $a\sim 1.09$ AU, $K\sim 0.05$ W/m/K, C=800 K/kg/K, $\rho _{\rm b}= 2.5$ g/cm³, P=2.27 hr and $R\simeq 635$ m. The best estimated position of Icarus' spin axis orientation is shown with full circle on the right plot ( $s_P\sim -0.095$ , $s_Q\sim 0.967$ ; De Angelis 1995). D=0 isoline is shown by the thick solid line; dashed isolines are for negative values of D_a with an increment of 1%, such that the solid dashed isolines show values D_a=-5% and D_a=-10%.
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