The infrared spectrometer, proposed by U Mall and H U Keller of Max Planck Institute, Germany, is a grating spectrometer covering the wavelength range of 0.93 to 2.4 μm, having a spectral resolution of 6 nm and an angular resolution of 1.11 milirad. It is similar to the Smart-1 infrared spectrometer, described by Keller et al (2003). The spectrometer collects the reflected sunlight, which with the help of suitable optics is dispersed by grating and analysed by photosensitive pixels. Apart from lunar mineral mapping, which is accomplished by pointing the spectrometer facing nadir, it is capable of active tracking of particular features of interest for some duration.
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