ИСТИНА

Lunar Infrared Spectrometer (LIS) is an experiment onboard Luna-Glob (Luna 25) and Luna-Resource (Luna 27) Russian surface missions. It’s a pencil-beam spectrometer to be pointed by a robotic arm of the land-ing module. The instrument's field of view (FOV) of 1° is co-aligned with the FOV (45°) of a stereo TV camera. The spectrometers will provide measurements of selected surface areas in the spectral range of 1.15-3.3 µm. The spectral selection is carried out by acoustooptic tunable filter (AOTF), which scans the spectral range se-quentially. Electrical command of the AOTF allows selecting the spectral sampling, and permits a random ac-cess if needed. One of the most impressive results of recent Moon studies is the discovery of water in the surface layer. The M3 spectrometer (Moon Mineragoly Mapper, spectral range of 0.46-3.0 µm) onboard Chandrayaan-1 discov-ered that significant part of Moon surface contains H2O/OH-bearing material. The M3 results are in line with earlier lunar observations, made in 1999 with the VIMS optical spectrometer from the Cassini spacecraft, and were confirmed by new SIM/Deep Impact mapping spectrometer observations. M3 was the first spectrometer, which carried out systematic mapping of the Moon in the IR and showed that hydrated mineral band at 3 µm is widely spread, especially at the polar regions. The IR measurements detect H2O and/or OH in the thin (few microns) surface layer of the Moon regolith. The primary goal of the LIS experiment is to detect the regolith hydration at 3 µm, identifying its form from the shape of the spectrum, and to follow its changes during the day/shadow pattern. LIS will allow also to study the mineralogical composition from mineral spectral signatures within the spectral range, and will serve for se-lection of samples to be analyzed by other instruments. The crater Boguslawski was selected as a primary land-ing site for Luna-Glob mission. For this reason we performed detailed study of this crater.