Global map of the abundance of hydrogen within the regolith of asteroid 4 Vesta determined from epithermal neutron counting data acquired by the NASA Dawn mission's Gamma Ray and Neutron Detector from low altitude [PRETTYMANETAL2012].

 
Citation Prettyman, T.H., Dawn GRaND thermal and epithermal counting rate maps, DAWN-A-GRAND-5-VESTA-HYDROGEN-V1.0, NASA Planetary Data System, 2013.
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Data Set Abstract A global map of the abundance of hydrogen in micrograms/g within the regolith of asteroid 4 Vesta is provided for two-degree equal-angle pixels. Hydrogen abundances were determined from epithermal neutron counting data acquired by the NASA Dawn mission's Gamma Ray and Neutron Detector (GRaND) while in low altitude mapping orbit, about 210 km from Vesta's surface. The abundances are representative of Vesta's bulk regolith composition to depths of a few decimeters with a spatial resolution of about 300-km full-width-at-half-maximum of arc length on the surface. The methods used to determine hydrogen abunance are described by PRETTYMANETAL2012.
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    Additional Information
    Mission Information DAWN MISSION TO VESTA AND CERES
    Data Set Information DAWN-A-GRAND-5-VESTA-HYDROGEN-MAP-V1.0
    Instrument Host Information DAWN
    Instrument Information GRAND
    Target Information 4 VESTA