  The ESA's JUICE mission will provide a thorough investigation of the Jupiter
system and the Galilean moons during its nominal tour, comprising flybys of
Europa and Callisto, and an orbital phase about Ganymede at the end of the
mission. The 3GM experiment will exploit accurate Doppler and range
measurements to determine the moons' orbits and gravity fields (both static and
tidal) and infer their interior structure. This paper presents the attainable
accuracies of the Callisto geodesy experiment and addresses the effect of
different flybys mean anomaly distribution and geometry on the estimation of
the tidal Love number k2.
