The structure of the Geminid meteor stream. II - The combined action of the cometary ejection process and gravitational perturbations

Details The structure of the Geminid meteor stream. II - The combined action of the cometary ejection process and gravitational perturbations The structure of the Geminid meteor stream. II - The combined action of the cometary ejection process and gravitational perturbations

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..479j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 479-486. NSERC-supported research

Astronomy and Astrophysics

Astronomy

18

Comets, Geminid Meteoroids, Gravitational Effects, Solar Orbits, Orbital Elements, Root-Mean-Square Errors

Scientific paper

We have extended the theory of Fox, Williams & Hughes for the evolution of the Geminid meteor stream under the perturbing influence of the gravitation attraction of the planets. Whereas the original theory allowed for the planetary perturbations by ascribing to each particle the rates of change of orbital elements appropriate to the mean orbit we note that the motions of the orbital elements are themselves functions of the orbital energy and angular momentum. Since the ejection velocity from the comet depends on particle mass, the spread in orbital size and shape and hence the precession and nutation rates are also mass-dependent. We have shown that the inclusion of this effect causes the duration of the shower to increase with time so offering hope of a reconciliation of theory and observation and it also predicts a very low apparent rate of retrogression of the ascending node as is observed.

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