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Mon. Not. R. Astron. Soc. 000, 000--000 (0000) Printed 9 March 1999 (MN L A T E X style file v1.4) Resonant meteoroids from Comet TempelTuttle in 1333
 

Summary: Mon. Not. R. Astron. Soc. 000, 000--000 (0000) Printed 9 March 1999 (MN L A T E X style file v1.4)
Resonant meteoroids from Comet Tempel­Tuttle in 1333:
the cause of the unexpected Leonid outburst in 1998
D.J. Asher 1? , M.E. Bailey 1 and V.V. Emel'yanenko 2
1 Armagh Observatory, College Hill, Armagh, BT61 9DG, U.K.
2 Department of Theoretical Mechanics, South Ural University, Chelyabinsk, 454080, Russia
Accepted 1999 March 9. Last update 1999 March 1; in original form 1999 January 11
ABSTRACT
Recent observations of an unexpectedly high incidence of bright Leonid meteors about
16 hours before the predicted maximum of the main shower are explained by the ejec­
tion of dust grains into the 5/14 mean­motion resonance with Jupiter, principally
during the perihelion passage of Comet 55P/Tempel­Tuttle in 1333. The dynamical
evolution of resonant grains has the following properties: first, they do not spread uni­
formly around the orbit, but instead librate about a resonance centre within the main
stream; secondly, these resonant zones contain a much higher space density of particles
than the background stream, with the particle density approaching that of recently
ejected cometary grains; and thirdly, differential precession between the cometary or­
bit and the orbits of resonant particles may lead to meteor storms at unexpected times,
possibly far removed from that of the normal shower. The presence of resonant dust
grains leads to a complex structure within the Leonid meteoroid stream, and is an

  

Source: Armagh Observatory

 

Collections: Physics