Very precise orbits of 1998 Leonid meteors

Details Very precise orbits of 1998 Leonid meteors Very precise orbits of 1998 Leonid meteors

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..979b&link_type=abstract

Meteoritics & Planetary Science, vol. 34, no. 6, pp. 979-986 (1999).

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Scientific paper

Seventy-five orbits of Leonid meteors obtained during the 1998 outburst are presented. 38 are precise enough to recognize significant dispersion in orbital elements. Results from the nights of Nov. 16/17 and 17/18 differ, in agreement with the dominant presence of different dust components. The shower rate profile of Nov. 16/17 was dominated by a broad component, rich in bright meteors. The radiant distribution is compact. The semi-major axis is confined to values close to that of the parent comet, while the distribution of inclination has a central condensation in a narrow range. On the other hand, Nov. 17/18 was dominated by dust responsible for a more narrow secondary peak in the flux curve. The declination of the radiant and the inclination of the orbit are more widely dispersed. The argument of perihelion, inclination, and the perihelion distance are displaced. These data substantiate the hypothesis that trapping in orbital resonances is important for the dynamical evolution of the broad component.

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