The Finson–Probstein model follows cometary dust after release with negligible ejection speed under stellar gravity reduced by radiation pressure. A grid of synchrones and syndynes organizes the resulting dust-tail morphology.
A synchrone is the locus, at one observation time, of grains released at the same time with different radiation-pressure coefficients.
A syndyne is the locus, at one observation time, of grains with the same radiation-pressure coefficient released at different times.
A cometary dust tail is the extended distribution of solid grains released by a comet. Radiation pressure sorts its grains by size: high- grains are displaced rapidly in the anti-stellar direction, while larger low- grains remain closer to the projected orbit and form a more curved trail.
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