Bulletin 14 of the International Leonid Watch: Visual Results and Modeling of the 1998 Leonids

Details Bulletin 14 of the International Leonid Watch: Visual Results and Modeling of the 1998 Leonids Bulletin 14 of the International Leonid Watch: Visual Results and Modeling of the 1998 Leonids

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jimo...27..267a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 27, no. 6, p. 267-285

Computer Science

10

Scientific paper

A comprehensive analysis of the 1998 Leonid meteor shower is given, based on 70800 Leonids recorded by 473 observers. The activity profile is characterized by two distinct maxima of different origin: a strong, broad component of particles ejected a few tens of revolutions ago, centered at lambda=234.528+-0.006 (November 17, 1998, 1h55m+-9m UT) with a maximum equivalent ZHR of 357+-11, and a short-lived component rich in smaller particles at lambda=235.311+-0.007 (November 17, 1998, 20h33m+-10m UT), which is near the Earth's passage of the orbital node of the parent comet, 55P/Tempel-Tuttle. All solar longitude refer to equinox J2000. The maximum equivalent ZHR at this nodal peak was 136+-5. The early peak has a maximum flux of 0.015+-0.001 meteoroids brighter than magnitude +6.5 per square kilometer and per hour. The second maximum has a peak of 0.028+-0.003 meteoroids brighter than magnitude +6.5 per square kilometer and per hour. Model calculations integrating the motion of more than a million particles ejected up to 2000 years ago show very good agreement with the time of the observed component of bright meteors. Due to a preference for larger particles in the simulations, the nodal peak is not visible in the model. We suggest the most probable source for the nodal peak particles are the ejections from 1965, 1932, and/or 1899 with Leonids having higher ejection velocities and smaller meteoroids being dynamically preferred for delivery to Earth.

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