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Information × Registration Number 0213U001494, 0111U001457 , R & D reports Title Investigation of Opposition effects of small Solar system bodies popup.stage_title Head Belska Irina Mikolaivna, Registration Date 25-02-2013 Organization Kharkov National University named after V.N. Karazin popup.description2 Research object is the asteroids of the main zone, Trojan asteroids and Kojper's zone bodies; laboratory samples which are the analogues of substance, containing the surface of bodies of Sun system. The purpose of work is measurement of phase dependences of lustre and polarisations; definition of amplitude and other specifications of opposition effect; definition of optical and physical specifications of surfaces of asteroids and their comparison is with results of laboratory simulation; creation of the databank of phase dependences of lustre and polarisations of surfaces of small bodies of Sun system and their analogues. Methods of research are photometric and поляриметрические supervision, computer data processing, statistical analysis. Throughout 127 night photometric and polarymetric supervision of 12 small bodies of Sun system of different dynamic origin are conducted. For the first time detailed phase dependences of lustre in the area of opposition effect of two троянцев Floodlight and three asteroids of the group of Gil'dy are measured. It is confirm absence of non-linear increase of lustre on small phase angles at троянцев Floodlight and the asteroids of the Р-type of the group of Gil'dy that it is atypical for other non-atmospheric space bodies. The asteroid of the With-type of the group Gil'dy shows a standard phase dependence, characteristic of low albedo asteroids of the main zone. It is shown for the first time that size of amplitude of opposition effect influences substantially definition альбедо троянцев. It is shown that use for definition of absolute stellar size Trojan asteroids HG-function results in a systematic overestimate of them albedo. Taking into account absence of amplitude of opposition effect, absolute stellar size for 32 Trojan asteroids is determined and new values of them albedo are calculated. These data point to the fact that surface Trojan asteroids I have a very low reflecting ability and they are the most dark objects of Sun system. It is shown for the first time that width of the branch of negative polarisation of low albedo asteroids does not show an appreciable dependence from amplitude of opposition effect of lustre. It is shown that Kojper's zone bodies, on surface of which methane ices dominate, have resembling polarizing properties and differ substantially by the microstructure of the surface from other bodies. Three electronic databases are generated and complement which include results of supervision of phase dependences of lustre of asteroids, phase dependences of polarisation of centaurs and Kojper's zone bodies, laboratory measurements of phase dependences of lustre and polarisations of meteorites and ground analogues of space substance. Received results are rough surfaces of celestial bodies base for improvement of the theory of dissipation of the light, revision of existing computer system of absolute stellar sizes of small bodies, development of adequate models of thermal properties of surfaces of small bodies, needed for analysis of space data. Product Description popup.authors Бельська І. Величко Ф. Довгопол А. Круглий Ю. Лупішко Д. Слюсарев І. Чорний В. Шевченко В. popup.nrat_date 2020-04-02 Close