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NASA/JPL comet orbits
Comet Return Calendar
Compare notable comet paths, orbital periods and their next calculated passage nearest the Sun.
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Choose a comet and drag the plot to inspect its orbital inclination.
Cached orbital elements
Notable comet returns
Return dates are advanced from the current JPL orbital period and perihelion solution. Planetary perturbations and comet activity can shift future returns, especially for long-period comets.