Statistics – Computation
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0820k&link_type=abstract
American Astronomical Society, DPS meeting #28, #08.20; Bulletin of the American Astronomical Society, Vol. 28, p.1087
Statistics
Computation
Scientific paper
The dynamics of large dust particles in the vicinity of cometary nuclei is investigated using a computational model which includes the effects of gas drag, nucleus gravity, tidal and radiation pressure forces. The drag force is provided by a superposition of axisymmetric jets computed by solving the Euler equations with a Godunov-type method. Particle trajectories are then calculated by Runge-Kutta integration with adaptive control of the timestep. It is shown that particles ejected from the fringes of an active region could fall back onto the nucleus after typical flight times of hours to weeks. Dependent on the size distribution some percent of the ejected dust mass returns, thereby creating a sedimented layer with an average thickness of a few cm per orbital revolution. Furthermore, it is shown that some particles in the cm size range can enter gravitationally bound orbits around the comet. The possible implications of these particle populations for the ESA ROSETTA mission are discussed.
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