VIR, the Visible-IR Mapping Spectrometer of Dawn

Details VIR, the Visible-IR Mapping Spectrometer of Dawn VIR, the Visible-IR Mapping Spectrometer of Dawn

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p53a0994c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P53A-0994

Computer Science

Performance

6205 Asteroids, 6297 Instruments And Techniques

Scientific paper

Dawn Mission, that will visit Vesta and Ceres, will be the first mission visiting the dwarf closer top the Earth, Ceres. Moreover, Dawn will visit Vesta, that is also a very special body, being one of the few asteroids of the main belt that are supposed undergo to a differentiation. Therefore Vesta is an important example of intermediated objects that possibly undergo to a pristine differentiation, might be due to the decay of short lived radioactive elements. Only in situ observation will be able to disentangle the real nature of Vesta and Ceres. Dawn mission is perfectly suited to do that, thanks to its payload, that will permit to study the geology ( thanks to FC, the cameras), the geochemistry ( thanks to the Grand, gamma spectrometer) and mineralogy (thanks to VIR- MS, the imaging spectrometer). Here we will describe the VIR-MS characteristics. VIR-MS is an imaging spectrometer coupling high spectra and spatial resolution in the Visible (0.25-1 micrometer) and IR (0.95-5 micrometers) ranges. We have developed a spectrometer able to cover both Visible and IR regions of the spectrum combining these two spectral ranges in one instrument because diagnostic minerals have absorption bands in the Visible and NIR regions. We will describe VIR and its expected performances in terms of understanding both Vesta and Ceres.

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