Evolution of the minimum distance between the orbital arcs of comet 2P/Encke and Earth from 50 000 yr before the present up to the present. The minimum distance of the post-perihelion (pre-perihelion) arc is shown by the violet (cyan) curve when the evolution of the 2P orbit was followed ignoring the non-gravitational force. When this force is taken into account, the minimum distance is shown by the green (brown) curve.
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