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Fig. 1


Behavior of perihelion distance (panel a), semi-major axis (panel b), eccentricity (panel c), argument of perihelion (panel d), longitude of ascending node (panel e), and inclination to the ecliptic (panel f) of the nominal orbit of comet C/1964 N1. The evolution of the minimum distance between the orbital arcs of comet C/1964 N1 and Earth is shown in plot (panel g). The minimum distance of the post-perihelion (pre-perihelion) arc is shown by the red solid (blue dashed) curve. All plots are constructed for the period from time 100 000 yr before the present to the present.

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