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Information × Registration Number 0223U000889, 0121U109815 , R & D reports Title Dynamics and kinematics of near-Earth asteroids under the action of non-gravitational forces popup.stage_title Head Belska Iryna М., д.ф.-м.н. Registration Date 21-01-2023 Organization V.N. Karazin Kharkiv National University popup.description2  Photometric observations of 36 near-Earth asteroids were carried out during 87 observational nights. They included 3 newly discovered and 15 potentially dangerous asteroids. The observations were made within the framework of international cooperation at the telescopes of Georgia, Bulgaria, Uzbekistan, Kazakhstan and Chile. The rotation periods of 5 asteroids were determined for the first time. The rotation of 6 very small asteroids with diameters of less than 300 m - 500 m was studied, of which 3 were found to have ultra-fast rotation with rotation periods faster than 2.2 hours. According to the results of the search for binary asteroids of different types, we found that the asteroid (5693) 1993 EA is a binary system, which was confirmed by radar observations. Long-term photometric observations were obtained for three known binary systems to identify the influence of the BYORP effect on their rotation. A physical model of the potentially dangerous asteroid (23187) 2000 PN9 was created based on the results of long-term photometric observations and available radar data. It made possible to determine the minimum possible value of the asteroid's YORP acceleration, but no change in its rotation period under the influence of the effect was found. It is likely that 2000 PN9 is an object that has evolved under the YORP action and it is an example of YORP equilibrium. The first polarimetric observations of the potentially dangerous asteroid (65803) Didymos after the collision with the DART spacecraft were obtained. The value of the degree of linear polarization of Didymos close to the polarization maximum was found to differ from the typical values for S-type asteroids. A model of the dynamic evolution of an asteroid under the action of the normal YORP effect was created, taking into account the non-sinusoidal dependence of the YORP effect on the asteroid’s inclination. The contribution of small-scale surface roughness to the tangential effect of the YORP was estimated Product Description popup.authors Golubov Оleksiy A Kyrylenko Ihor I Krugly Yurij M. Mykhailova Sofia S. popup.nrat_date 2023-01-21 Close