Past dynamical evolution of Phaethon’s orbit: (i) semimajor axis (top); (ii) eccentricity (middle); and (iii) inclination (bottom). Left panels show the whole integrated time-span of 1 Myr, right panels show just the first 50 kyr – in both cases time goes to the past. We show the nominal orbit (black line), and also orbits of the 50 clones (gray lines). The true past orbital evolution might have been any of those histories. Moreover, red lines represent clone evolution with an eccentricity that steadily decreases to the past.
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