... Data Products . ... PlanetTreky: Treking the planets at Arecibo . ... Constraints on planetesimal disk mass from the cratering and equatorial ridge on Iapetus . Estimating the size of late veneer impactors from impact-induced mixing on Mercury . ... The colors represent the number of times an area on the surface has been excavated by an impact. ... Map of the thermal inertia of Iapetus ( Rivera-Valentin et al., ... The colors represent the magnitude of the thermal inertia in J m -2 K -1 s -1/2 . ...