Statistics – Methodology
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.397h&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 397-401 (SEE N
Statistics
Methodology
2
Astronomical Models, Comet Nuclei, Cosmic Dust, Halley'S Comet, Ice, Giotto Mission, Porosity, Refractory Materials, Vega Project
Scientific paper
Using Vega and Giotto data, a Halley nucleus model that retains the advantages of the icy conglomerate formalism on a local level, while at the same time introduces a global framework is outlined. A methodology for calculating the evolution and thermal profiles of the nucleus is presented. The fact that dust activity is confined for the most part to jets, that the majority of the surface is relatively inactive with a uniform porous dust covering, and that the altitude variations are of the order of 100 m, suggest that the nucleus is composed of large (tens of centimeters to hundreds of meters) porous refractory boulders, cemented together with an ice-dust grain mix of the icy conglomerate type (Whipple glue). The boulders are similar in composition to the outer asteroid belt objects and the irregular outer satellites of the giant planets, i.e., hydrous silicates containing complex carbon compounds.
Gombosi Tamas I.
Houpis Harry L. F.
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