Search academic texts

Information × Registration Number 0219U003552, 0116U000831 , R & D reports Title Mapping of optical, structural and chemical-mineralogical properties of the Moon using of space missions data popup.stage_title Head Vadym Kaydash, Registration Date 23-01-2019 Organization Kharkov National University named after V.N. Karazin popup.description2 Object of the investigations is the lunar surface. Subject of the research is optical, physical, structural and chemical-mineralogical properties of the lunar surface. Goal of the work is improvement of algorithms for photometric correction of images obtained by low-orbit spacecrafts. Methods of investigation are spectrometrical and photometrical, using theoretical analysis and computer simulation for interpreting the results. The basic tasks and methods of optical remote sensing of the lunar surface with aim to obtain new information about the physical properties (optical and structural properties) and chemical and mineralogical composition of the surface layer of the Moon are discussed. The method of transformation of cartographic projections of images obtained by wide-angle cameras from low orbits with taking into account the influence of relief has been proposed. A method based on photoclinometry for taking into account the influence of topographic effects on photometric data is proposed. It is shown that the new method allows estimation of the influence of relief on photometric observations with maximum quality. The method of constructing the seamless mosaics of optical parameters of the lunar surface based on the data of the LROC WAC camera has been developed. It allows us to map optical, structural and chemical-mineralogical (in particular, TiO2) properties of the surface of the Moon on this basis. Together with using other data, such as Clementine UVVIS, LRO Diviner, LRO NAC, Chandrayaan-1 M3, MI Kaguya, this method allowed to carry out a comprehensive study of the physical nature of a number of formations on the surface of the Moon: photometric anomalies in Mare Nubium; three red spots on the surface of the Moon (Helmet, Hansteen Alpha and the northwest quadrant of the crater Copernicus); dark mantle deposits in the crater Alphonsus; in the vicinity of crater Lubiniezky, a new class of geological processes on the Moon has been discovered - ballistic erosion/deposition caused by the eject from crater Tycho. Based on LROC WAC data, the opposition effect of brightness of the lunar surface was investigated. It was found that the slope of the phase curve at small phase angles is directly correlated with the albedo, while at the large phase angles inverse correlation is observed. The parameter "coherent backscattering width" is proposed to describe the coherent component of the lunar opposition spike. The maximum amplitude of the coherent opposition effect is estimated to be near 8%. The natural and artificial changes of regolith layer and their effect on photometric properties of the surface are investigated by the example of two new lunar craters formed in 2013. A greater slope of the phase function for craters and ejecta zones has been found. Asymmetric distribution of the optical roughness of zone of the nearest ejecta is interpreted as a result of an oblique impact. Dark halos of natural and artificial craters can be associated with condensed thin films of evaporation products during impacts. A lot of secondary impacts found around new craters can be formed by the interaction of the excavated soil with the cloud of evaporated substance. The obtained results can be used in the planning and implementation of space missions to the Moon and other atmosphereless bodies of the Solar system by world space agencies. Product Description popup.authors В.В. Корохін В.Г. Кайдаш В.Г. Шевченко Г.П. Марченко Д.Г. Станкевич Л.В. Градиська М.В. Опанасенко С.Ф. Величко Ю.І. Великодський Ю.Г. Шкуратов popup.nrat_date 2020-04-02 Close