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The effects of outgassing on comet orbits can be noticeable. Yeomans, in Cometary orbit determination and nongravitational forces, 2004, wrote:

As the astrometric datasets improve and lengthen and as the modeling of the cometary nongravitational effects becomes more realistic, there remains the strong possibility that some physical characteristics of comets will soon be accurately determined from the orbit-determination process alone. We are already beginning to see signs that this is the case.

How much does the orbital period of comet Halley vary due to these nongravitational forces? Hours? Days?

Which comets have the largest perturbations due to these forces?

Note: a more sophisticated question along these lines is Did Rosetta improve on models of non-gravitational effects on comet 67P's orbit? - Space Exploration Stack Exchange

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  • $\begingroup$ Loosely speaking, closer passes to the sun should have greater orbital out-gassing effects. The calculation is more complicated than inverse square rule cause it's also time spent at that distance. Very close passes will disburse a comet completely like comet Ison, but that one passed within a million miles of the sun. You should also account for surface area to mass ratio (which roughly corresponds to radius ratio) and, though harder to find data on, density and makeup of the comet. Putting those 3 bits of information together would be a start. $\endgroup$ – userLTK May 16 '17 at 21:15

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