MSFC Stream Model Preliminary Results: Modeling Recent Leonid and Perseid Encounters |
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Authors: | Danielle E Moser William J Cooke |
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Institution: | (1) Morgan Research Corp., NASA/Marshall Space Flight Center, UNITeS, Building 4487, EV13, 35812 Huntsville, AL, USA |
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Abstract: | The cometary meteoroid ejection model of Jones and Brown Physics, Chemistry, and Dynamics of Interplanetary Dust, ASP Conference Series
104 (1996b) 137] was used to simulate ejection from comets 55P/Tempel-Tuttle during the last 12 revolutions, and the last 9 apparitions
of 109P/Swift-Tuttle. Using cometary ephemerides generated by the Jet Propulsion Laboratory’s (JPL) HORIZONS Solar System
Data and Ephemeris Computation Service, two independent ejection schemes were simulated. In the first case, ejection was simulated
in 1 h time steps along the comet’s orbit while it was within 2.5 AU of the Sun. In the second case, ejection was simulated
to occur at the hour the comet reached perihelion. A 4th order variable step-size Runge–Kutta integrator was then used to
integrate meteoroid position and velocity forward in time, accounting for the effects of radiation pressure, Poynting–Robertson
drag, and the gravitational forces of the planets, which were computed using JPL’s DE406 planetary ephemerides. An impact
parameter (IP) was computed for each particle approaching the Earth to create a flux profile, and the results compared to
observations of the 1998 and 1999 Leonid showers, and the 1993 and 2004 Perseids. |
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Keywords: | Comet comet ejection Leonids meteor meteor shower meteoroids model predictions numerical integration Perseids |
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