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The Hyper Spectral Imager Instrument on Chandrayaan-1

Introduction: The Hyper Spectral Imager (HySI) [1,2], operating in visible and near infrared spectral region, is one of the three spectral imager onboard Chandrayaan-1 for mineralological study of the lunar surface. It complements the Moon Mineralogical Mapper (M-cube) and Near-IR spectrometer (SIR-2) by extending the spectral coverage in the lower range upto 400nm. The total spectral range of 421nm to 964nm is resolved in 64 contiguous bands with spectral sampling better than 20nm. The spatial sampling for all bands is 80m and the pixel value is 12 bit quantized. The instrument maps the lunar surface in push broom mode with a swath of 20km from the polar orbit of 100km altitude. The spatial and spectral data from the instrument will improve the knowledge of the mineral composition of the lunar surface. These data combined with the study of deep craters like South Pole-Aitken basin, which contains surface expression of lower crustal or upper mantle material, as well as central hills of targeted lunar craters will further our understanding of the mineralogical composition of crust and its formation and evolution.