MINERALOGICAL ANALYSIS OF THE HAULANI QUADRANGLE ON THE DWARF PLANET CERES
Hyperspectral images returned by the Visible and InfraRed (VIR) mapping spectrometer onboard Dawn enabled a careful mineralogical analysis of the Haulani quadrangle. In the High-Altitude Mapping Orbit HAMO phase, yielding an average pixel resolution of ~0.38 km, VIR obtained nearly global coverage of quadrangle Ac-H-6. Based on this dataset, crater Haulani also stands out compared to the rest of the quadrangle. The spectral features centered at 2.7 and 3.06 µm, respectively indicative of the presence of hydrous minerals and ammoniated phyllosilicates, show a decrease of band depth in the floor and in Haulani’s bright ejecta, corresponding to the blue spectral slope.
Similar, but less prominent, spectral behavior, is observed in other small craters found within this quadrangle.
This work is supported by the Italian Space Agency (ASI). VIR was funded and coordinated by the Italian Space Agency, with the scientific leadership of the Institute for Space Astrophysics and Planetology, Italian National Institute for Astrophysics, Italy. Support of the Dawn Science, Instrument, and Operation Teams is gratefully acknowledged.