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Water Ice Abundance on Ceres

The first animation below shows dwarf planet Ceres overlaid with the concentration of hydrogen determined from data acquired by the gamma ray and neutron detector (GRaND) instrument aboard NASA's Dawn spacecraft.  The hydrogen is in the upper yard (or meter) of regolith, the loose surface material on Ceres.  The color scale gives hydrogen content in water-equivalent units (assuming all of the hydrogen is in the form of H2O).  The color information is superimposed on shaded relief for context.   Some of the hydrogen is in the form of water ice.  A portion of the hydrogen is in the form of hydrated minerals (such as OH in serpentine group minerals).
The second animation compares the hydrogen content of Ceres regolith with the giant asteroid Vesta, which Dawn orbited from 2011 to 2012. These data show Vesta is a much drier world, with a much lower percent of hydrogen in its regolith.  Both maps were determined from data acquired by GRaND.

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