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

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
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
1. Kazantsev А. М. A simple method for calculating the evolution of orbits of near-Earth asteroids. Astron. Vestnik, 36 (1), 48—54 (2002).
2. Kazantsev А. М. Possible effect of spatial separation of bright and dark asteroids. Kinematics and Phys. Celestial Bodies, 23 (6), 349—358 (2007).
3. Kryszczynska A., Magnusson P. Asteroid spin vector compilation V5.0. EAR-A-5-DDR-ASTEROID-SPINVECTORS-V5.0. NASA Planetary Data System (2008).
4. Masiero J. R., Mainzer A. K., Grav T., et al. Main Belt Asteroids with WISE/NEOWISE. I. Preliminary albedos and diameters. Astrophys. J., 741 (2), art. id.68 (20 p.) (2011).
5. Paolicchi P., Kryszczyska A. Spin vectors of asteroids: Updated statistical properties and open problems.Planetary and Space Sci., 73 (1), 70—74 (2012).
6. Spitale J., Greenberg R. Numerical evaluation of the general Yarkovsky effect: Effects on semimajor axis. Icarus, 149 (1), 222—234 (2001).
7. Tedesco E. F., Noah P. V., Noah M., Price S. D. The supplemental IRAS minor planet survey. Astron. J., 123 (2), 1056—1085 (2002).