Global compositional cartography of Pluto from intensity-based registration of LEISA data

International audienceIn 2015 the New Horizons spacecraft reached the Pluto system and returned unprecedentedly detailed measurements of its surface properties. These measurements have already been integrated into global reectance, topography and narrow-band multispectral surface maps. However, analysis of the hyperspectral data from the Ralph/LEISA infrared spectrometer, which lets us analyse the surface composition, has until now been conned to the highresolution encounter hemisphere of Pluto. We use an innovative technique intensity-based registration to co-register this high-resolution data with lower-resolution measurements taken during the spacecraft's approach, and present the rst global qualitative composition maps for CH 4 , N 2 and H 2 O ice, and a tholin-like red material. We compare these maps with the other maps produced for Pluto and study the global extent of the previously-described latitudinal distribution of the surface components, which is relatively longitudinally constant with the exception of Sputnik Planitia. We also correlate these compositional components with geological features and propose physical interpretations, which include: CH 4-ice-rich dissected plateaus in high northern latitudes, CH 4-rich eroded terrain with N 2-rich inll in medium northern latitudes, CH 4-rich bladed terrain in low northern latitudes, and a red material belt overlaying H 2 O ice in low southern latitudes