An icy-glue model of cometary nuclei

Details An icy-glue model of cometary nuclei An icy-glue model of cometary nuclei

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.324...43g&link_type=abstract

Nature (ISSN 0028-0836), vol. 324, Nov. 6, 1986, p. 43, 44.

Astronomy and Astrophysics

Astronomy

45

Astronomical Models, Comet Nuclei, Halley'S Comet, Plasma Jets, Dust, Giotto Mission, Ice, Refractory Materials, Vega Project

Scientific paper

Recent imaging data from Halley's Comet are used as the basis for a model of the cometary nucleus as an agglomerate of porous refractory boulders held together with an ice-dust grain mix (Whipple glue). The boulders are similar in composition to asteroid bodies, i.e., hydrous silicates with complex carbon compounds. Regions on the nucleus surface where the volatile ice has dissipated are dust plates and share the surface with macropores, which may be 50-100 m deep and are the sites of jets. When sufficient Whipple glue is sublimated boulders can break off, exposing fresh ice, and flare events can be observed. The origins of nuclei with cometary compositions in the pre-Jupiter region are discussed.

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