MINERALOGY OF CERES' CONIRAYA QUADRANGLE
By the spectral analysis of VIR  data, four peculiar craters have been identified within the quadrangle:
- Gaue is the freshest large impact crater . Spectra of Gaue material display a decrease of the band depth (BD) at 3.05 μm indicating a lower presence of ammonium-phyllosilicates with respect the average terrain.
- Ikapati is another fresh crater with dozen small bright spots and ridges, inside and near the crater floor . It is associated to a decrease of 2.7 and 3.05 μm BD, indicating a lower presence of phyllosilicates. Moreover, it presents bluer spectral slope, indicating larger grain size of the regolith and/or larger presence of bluish material with respect the average terrain.
- Ernutet crater spectra display lower 2.7 μm BD as Gaue and Ikapati, but larger 3.05 μm BD indicating a dehydration and larger amount of ammonium-phyllosilicates. Moreover, it shows redder spectral slope which can be explained by a smaller grain size and/or by a slightly different composition with respect the average terrain.
- Oxo crater, located between the Coniraya and the Fejokoo quadrangle, stands out by the additional presence of water ice features .
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.
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