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Water and hydroxyl, once thought to be found only in the primitive airlessbodies that formed beyond roughly 2.5-3 AU, have recently been detected on theMoon and Vesta, which both have surfaces dominated by evolved, non-primitivecompositions. In both these cases, the water/OH is thought to be exogenic,either brought in via impacts with comets or hydrated asteroids or created viasolar wind interactions with silicates in the regolith or both. Such exogenicprocesses should also be occurring on other airless body surfaces. To test thishypothesis, we used the NASA Infrared Telescope Facility (IRTF) to measurereflectance spectra (2.0 to 4.1 {\mu}m) of two large near-Earth asteroids(NEAs) with compositions generally interpreted as anhydrous: 433 Eros and 1036Ganymed. OH is detected on both of these bodies in the form of absorptionfeatures near 3 {\mu}m. The spectra contain a component of thermal emission atlonger wavelengths, from which we estimate thermal of 167+/- 98 J m-2s-1/2K-1for Eros (consistent with previous estimates) and 214+/- 80 J m-2s-1/2K-1 forGanymed, the first reported measurement of thermal inertia for this object.These observations demonstrate that processes responsible for water/OH creationon large airless bodies also act on much smaller bodies.

Evidence for OH or H2O on the surface of 433 Eros and 1036 Ganymed