Computer Science
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.341b&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 341-345 (SEE N
Computer Science
Comet Nuclei, Giotto Mission, Halley'S Comet, Image Analysis, Satellite Imagery, Vega Project, Area, Density (Mass/Volume), Volume
Scientific paper
From the contours of the nucleus of Halley's comet as observed with Vega-1, Vega-2 and Giotto pictures, the overall shape of the nucleus, volume and surface area are determined with the help of a Computer-Assisted-Design software. A rotation period of 53 hr was assumed, and was shown more consistent with the pictures than a 7.5 days period, which could be a nutation period. Only prograde motions are possible for these two periods. The volume was found at 375 km3±30% and the surface area at 305 km2±20%. Compared with the mass estimate of 50 to 160 gigatons (Rickman, 1986), the density of the nucleus is small, between 0.1 and 0.54 tons/m3. It implies a formation distance much larger than Uranus-Neptune region. It is speculated that the porosity of the nucleus allows some compressibility and flexibility of the nucleus.
Abergel Alain
Bertaux Jean Loup
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