Radar properties of comets: Parametric dielectric modeling of Comet 67P/Churyumov-Gerasimenko

► Parametric dielectric properties of cometary analog materials are measured. ► We establish the dielectric constant dependence on porosity, dust fraction and temperature. ► We build two 3D dielectric models of Comet 67P to support future nucleus tomography. ► Different hypotheses on 67P's inner properties can be inferred from the dielectric properties. ► Surface temperature variation can induce measurable variations in the comet radar properties.