The orbital evolution of near-Earth asteroid 3753 (1986 TO)

P. Wiegert, K. Innanen (York University), S. Mikkola (University of Turku)

Asteroid 3753 (1986 TO) has recently been found to be co-orbital with the Earth; more precisely, it is in 1:1 resonance on a "horseshoe" type orbit. Though horseshoe orbits are rare in themselves, this configuration is made even more unusual by the asteroid's relatively large heliocentric eccentricity (e=0.51) and inclination ( tex2html_wrap_inline14 ). We discuss the nature of this asteroid's trajectory, the mechanisms by which it may have come to be in its current relationship with the Earth, and consider its long-term stability.