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Information × Registration Number 0306U001539, 0103U000666 , R & D reports Title Photometrical and polarimetrical research of the asteroids and comets popup.stage_title Фотометрія та поляриметрія астероїдів і комет. Поляриметричний банк кометних даних Head Lupishko Dmitro Fedorovich, Registration Date 20-04-2006 Organization Kharkov national university named after V.N. Karazin popup.description2 Objects of investigations: main-belt asteroids, near-Earth asteroids and comets. Purpose of the project is determination of magnitudes, colour indexes, the sizes, shapes, spin-vectors and optical properties of main-belt and near-Earth asteroids; polarization parameters of comets and their optical and physical properties, creation of Data-base of comet polarimetry. Methods of research: photometric and polarimetric observations, statistical analysis of data. During 53 nights the photometric observations of 17 asteroids and photometric and polarimetric ones of two comets were carried out. The lightcurves and magnitudes of these asteroids have been obtained; the compositional types and rotation periods for seven of them and BVRI-color indexes for four of them have been obtained; the polarimetric opposition effect of high-albedo asteroid 44 Nysa has been discovered; it is showed that irregular form of the distribution of near-Earth asteroid (NEA) rotation rates can be explained by the influence of the rotation parameters of binary systems among the NEAs and the fraction of binaries among them is estimated; the estimates of gas productivity and gas/dust ratio for comet С/2004 Q2 (Machholz) are obtained and it is classified as dust comet; the Database of comet polarimetry has been created. The obtained results are of great interest from the point of view of both fundamental science and the asteroid hazard problem. The lightcurves and parameters of polarization obtained in this project and Database of comet polarimetry are included to the international databases "Asteroid Photometric Catalogue" and "Planetary Data System", respectively. Product Description popup.authors popup.nrat_date 2020-04-02 Close