Asteroid 2010 TK7

This object is sometimes called Earth's Trojan. To earn this name it must remain close to Earth's L4 or L5 Lagrange points.

The simulation uses rotating coordinates to hold Earth in a fixed direction relative to the Sun and includes 15 clones spread over the uncertainty in the objects orbit.

It shows TK7 orbiting close to L4, However, running forward a few years and it is clear that the object is making its was round to L3 behind the Sun.

Long term simulations show it wandering backwards and forwards between Earth and L3 but always staying on the L4 side and the clones stay close together. I'm not sure this can be considered proper "Trojan" behaviour.

Past orbit

This simulation was created by integrating backwards to 150BC and shows where the clones would have been at that time. They are spread round both the L4 and L5 sides of Earth's orbit, some travelling clockwise and some anticlockwise. Clearly TK7 has not been a true "Trojan" in the past.

First observed by the WISE satellite on 2010-10-01, this simulation takes into account 44 observations up to 2012-11-07. The object is NEO, Aten, has a 1yr period, eccentricity of 0.19 and inclination of 20.8 degrees.

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The simulation includes Solar System planets (system barycentres) and 14 clones of 2010 TK7 generated by Find Orb Monte Carlo and one clone (yellow) based on state vectors from JPL. Yoshida 6th order integration, variable step time.