Other
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..537d&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Other
1
Comets: Families, Dust
Scientific paper
Dynamics of meteoroids and dust grains of cometary origin are investigated analytically and numerically. The gravity of the Sun and one planet, and the Poynting-Robertson effect are taken into account. A simple analytical formula for the orbital distribution of particles in the regime of close encounters with planet is proposed. The dust particles are subject to the Poynting-Robertson drag, nevertheless, close encounters dominate their dynamics. The particles leak from the encounter region once they get scattered into a thin layer at the inner boundary of the encounter region where the drag can withdraw them before their orbits are scattered back into the encounter region. The inclination and eccentricity of leaking particles are estimated roughly as a function of encounter speed with Jupiter, it is found that no or very little dust leaks from the orbits with inclinations below 10 degrees. To populate the inner zodiacal cloud at lower latitudes, another source is required - asteroids. It is found that almost all dust from Jupiter family comets that reaches the Earth had low encounter speeds with Jupiter. Dust with higher encounter speeds must have been scattered into hyperbolic orbits and left the Solar system.
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