Asteroids in Retrograde Orbits: Interesting Cases

Paweł Kankiewicz and Ireneusz Włodarczyk

We present the most interesting examples of the orbital evolution of asteroids in retrograde orbits (i > 90^o). First, we used the latest observational data to determine nominal and averaged orbital elements of these objects. Next, the equations of motion of these asteroids were integrated backward 1 My, taking into account the propagation of observational errors. We used so-called 'cloning' procedure to reproduce the reliability of initial data. We obtained some possible scenarios of the orbit inversion in the past, what is often caused by the long-term influence of outer planets. For two most interesting cases (Apollo and Amor type) we did additional calculations: 100 My in the future. Additionally, we investigated the potential in uence of Yarkovski/YORP effects on the long-time orbital evolution.

Proceedings of the Polish Astronomical Society, vol. 1, 167-169 (2014)

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