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Spectrometer data from LCROSS after impact

Spectrometer data from LCROSS after impact
Spectrometer data from LCROSS after impact The LCROSS visible spectrometer swept across the sunlit rim of Cabeus crater before the impact, then into darkness, whereupon the reflectance drops very sharply to a flat low. Then it swept across the impact site, where it detected a tiny "blip" from the impact. The sharp peak following that results from a known instrument artifact that had yet to be calibrated out in this early version of the data. NASA / GSFC / annotations by Emily Lakdawalla