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In this paper, a 3D convex shape model of (175706) 1996 FG3, which consistsof 2040 triangle facets and 1022 vertices, is derived from the knownlightcurves. The best-fit orientation of the asteroid's spin axis is determinedto be $\lambda =237.7^\circ$ and $\beta=-83.8^{\circ}$ considering theobservation uncertainties, and its rotation period is $\sim$ 3.5935 h . Usingthe derived shape model, we adopt the so-called advanced thermophysical model(ATPM) to fit three published sets of mid-infrared observations of 1996 FG3\citep{Wolters2011,Walsh2012}, so as to evaluate its surface properties.Assuming the primary and the secondary bear identical shape, albedo, thermalinertia and surface roughness, the best-fit parameters are obtained from theobservations. The geometric albedo and effective diameter of the asteroid arereckoned to be $p_{\rm v}=0.045\pm0.002$, $D_{\rm eff}=1.69^{+0.05}_{-0.02}$km. The diameters of the primary and secondary are determined to be$D_{1}=1.63^{+0.04}_{-0.03}$ km and $D_{2}=0.45^{+0.04}_{-0.03}$ km,respectively. The surface thermal inertia $\Gamma$ is derived to be a low valueof $80\pm40\rm Jm^{-2}s^{-0.5}K^{-1}$ with a roughness fraction $f_{\rm R}$ of$0.8^{+0.2}_{-0.4}$. This indicates that the primary possibly has a regolithlayer on its surface, which is likely to be covered by a mixture of dust,fragmentary rocky debris and sand. The minimum regolith depth is estimated tobe $5\sim20\rm mm$ from the simulations of subsurface temperature distribution,indicating that 1996 FG3 could be a very suitable target for a sample returnmission.

Shape, Thermal and Surface Properties determination of a Candidate Spacecraft Target Asteroid (175706) 1996 FG3