Mapping iron abundances on the surface of Mercury: Predicted spatial resolution of the MESSENGER Gamma-Ray Spectrometer

► Predictions of the performance of the MESSENGER Gamma-Ray Spectrometer. ► Discussion of the abilities of the instrument during Mercury orbital operations. ► Simulation of the spatial resolution of gamma-ray measurements of surface Fe. ► Units at least 800 km across are distinguishable if Fe abundances differ by 4 wt%.