Physical interpretations from the motions of comets Halley and Giacobini-Zinner

Details Physical interpretations from the motions of comets Halley and Giacobini-Zinner Physical interpretations from the motions of comets Halley and Giacobini-Zinner

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.419y&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 419-425 (SEE N

Astronomy and Astrophysics

Astronomy

4

Astronomical Models, Giacobini-Zinner Comet, Halley'S Comet, Orbits, Orbital Elements, Orbital Mechanics, Outgassing

Scientific paper

For both comets Halley and Giacobini-Zinner (GZ), the successful model of the rocket-like, outgassing forces affecting the comet's motions was consistent with the vaporization of water ice from the comet's nuclei. For comet GZ, the dramatic time dependence of the outgassing forces suggests that this comet's spin axis passed through the orbit plane in the mid 1960's. From the successful modeling of Halley's motion over two millennia, the author concludes that the comet is rotating in a direct sense, with no obvious long-term time dependence in the average outgassing forces. The precession of the spin pole axis is not apparent. Secular changes in the comet's angular elements show no evidence for a ring of comet-like material beyond the orbit of Neptune. An obvious 1986 post-perihelion bias in comet Halley's observation residuals was successfully modeled by assuming a radial center-of-light/center-of-mass offset.

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