Very precise orbits of 1998 Leonid meteors

Citation
H. Betlem et al., Very precise orbits of 1998 Leonid meteors, METEORIT PL, 34(6), 1999, pp. 979-986
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
METEORITICS & PLANETARY SCIENCE
ISSN journal
1086-9379 → ACNP
Volume
34
Issue
6
Year of publication
1999
Pages
979 - 986
Database
ISI
SICI code
1086-9379(199911)34:6<979:VPOO1L>2.0.ZU;2-C
Abstract
Seventy-five orbits of Leonid meteors obtained during the 1998 outburst are presented. Thirty-eight are precise enough to recognize significant disper sion in orbital elements. Results from the nights of 1998 November 16/17 an d 17/18 differ, in agreement with the dominant presence of different dust c omponents. The shower rate profile of 1998 November 16/17 was dominated by a broad component, rich in bright meteors. The radiant distribution is comp act. The semimajor axis is confined to values close to that of the parent c omet, whereas the distribution of inclination has a central condensation in a narrow range. On the other hand, 1998 November 17/18 was dominated by du st responsible for a more narrow secondary peak in the flux curve. The decl ination of the radiant and the inclination of the orbit are more widely dis persed. The argument of perihelion, inclination, and the perihelion distanc e are displaced. These data substantiate the hypothesis that trapping in or bital resonances is important for the dynamical evolution of the broad comp onent.