Fig. 1

Behavior of perihelion distance (panel a), semimajor 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 initially nominal orbit of comet C/1963 A1 (Ikeya). The evolution is reconstructed backward for 100 000 yr. A nongravitational force is ignored.
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