A non-gravitational effect and spin orientation of main belt kilometer-sized asteroids

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1Kazantsev, AM, 1Kazantseva, LV
1Astronomical Observatory of the Taras Shevchenko National University of Kyiv
Space Science and Technology 2017, 23 ;(3):42-46
Section: Space Astronomy
Publication Language: Russian
Abstract: 
We present the results of the numerical calculations of the orbital evolution of the main belt (MB) asteroids over the period from 2005 to 2016. We show that, at the present time, the non-gravitational effects of a cometary nature are the essential factors affecting changes in the semi-major axes of the orbits of a significant part of the MB low-albedo asteroids with dimensions up to 40 km. The change in the semi-major axis of an asteroid’s orbit depends on the spin direction. Therefore, precise numerical calculations of the evolution of their orbits may indicate the direction (prograde or retrograde) of the axis of their rotation.
Keywords: asteroid, non-gravitational effect, spin axis
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