On the density of Halley's comet

Details On the density of Halley's comet On the density of Halley's comet

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...82...36p&link_type=abstract

Icarus (ISSN 0019-1035), vol. 82, Nov. 1989, p. 36-49.

Physics

48

Comet Nuclei, Density Measurement, Ejecta, Halley'S Comet, Light Curve, Orbit Perturbation, Solar Orbits, Water

Scientific paper

The density of Comet Halley is presently determined as a function of (1) its ejected material's time of visibility; (2) the angular deviation alpha of the averaged reaction force due to jets of ejected material from the sun-comet direction, and (3) the thermal inertia for a variable alpha. The averaged gas ejection rate variation from the nucleus as a function of orbital true anomaly is estimated on the basis of the Green and Morris (1987) lightcurve. While some of the densities obtained are in reasonable agreement with the expected 1 g/cu cm, uncertainties associated with both parameters and assumptions weaken the significance of these density constraints.

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