Saint-Petersburg State University
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Using numerical modeling, perturbations that occur in the rotational motion of small (10-50 m in diameter) asteroids during their close approaches to the Earth (at distances of the order of several Earth radii) are considered. For a number of asteroids (Duende, 2012TC4 and 2023BU), estimates of possible changes in the rotational period $P$ and the orientation of the rotational axis due to approach to the Earth were obtained. It has been established that in the case of fast rotation of an asteroid ($P < 1$ h), perturbations in its rotational motion that arise during approach are negligible. With a relatively slow rotation of the asteroid ($P > 5$ h), perturbations can be significant: changes in $P$ may reach several hours, and deviations of the rotation axis from the initial position may amount to tens of degrees. Such perturbations influence further orbital dynamics of a slowly rotating asteroid by changing the magnitude of the Yarkovsky effect.
celestial mechanics; minor planets, asteroids: general; methods: numerical
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