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We report 491 new near-infrared spectroscopic measurements of 420 near-Earthobjects (NEOs) collected on the NASA InfraRed Telescope Facility (IRTF) as partof the MIT-Hawaii NEO Spectroscopic Survey (MITHNEOS). These measurements werecombined with previously published data (Binzel et al. 2019) and bias-correctedto derive the intrinsic compositional distribution of the overall NEOpopulation, as well as of subpopulations coming from various escape routes(ERs) in the asteroid belt and beyond. The resulting distributions reflect wellthe overall compositional gradient of the asteroid belt, with decreasingfractions of silicate-rich (S- and Q-type) bodies and increasing fractions ofcarbonaceous (B-, C-, D- and P-type) bodies as a function of increasing ERdistance from the Sun. The close compositional match between NEOs and theirpredicted source populations validates dynamical models used to identify ERsand argues against any strong composition change with size in the asteroid beltbetween ~5 km down to ~100 m. A notable exception comes from the over-abundanceof D-type NEOs from the 5:2J and, to a lesser extend, the 3:1J and nu6 ERs,hinting at the presence of a large population of small D-type asteroids in themain belt. Alternatively, this excess may indicate preferential spectralevolution from D-type surfaces to C- and P-types as a consequence of spaceweathering, or to the fact that D-type objects fragment more often than otherspectral types in the NEO space. No further evidence for the existence ofcollisional families in the main belt, below the detection limit of currentmain-belt surveys, was found in this work.

the astronomical journal

The debiased compositional distribution of MITHNEOS: Global match  between the near-Earth and main-belt asteroid populations and excess of  D-type Near-Earth Objects