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Initial data from Dawn's VIR spectrometer

Initial data from Dawn's VIR spectrometer
Initial data from Dawn's VIR spectrometer On December 11, 2007, Dawn's VIR spectrometer pointed at the star Arcturus to test the instrument's performance. These spectra have not been calibrated, but are provided here for public interest. (The strong dip in the visible spectrum at 676.7 nm is from a filter in the instrument and is not a feature of the star's spectrum.) The visible image is a composite of measurements at red (734 nm), orange (626 nm), and green (563 nm) wavelengths. The infrared image of Arcturus is from VIR's infrared detector at 1383 nm. NASA / JPL-Caltech / INAF / ASI