An elliptical orbit with the Sun at one focus (not the center!).
Positions are each 5 years apart. Planet speeds up when close to the
Sun and slows down when moving away (the line between the planet and
Sun sweeps out equal areas in equal intervals of time.) The planet's average
distance from the Sun (orbit semimajor axis) is 25 AU, so its orbital period is
125 years (derived from 253 = 1252).
last updated: 08 May 2001
Is this page a copy of Strobel's
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