Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..707s&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 707-712 (SEE N88-21884 14-91)
Physics
3
Comet Nuclei, Halley'S Comet, Size Determination, Albedo, Comets, Light Curve, Radii, Spectrophotometry, Tables (Data)
Scientific paper
Photometric data referring to heliocentric distances beyond 2.5 AU on the preperihelion arc of the orbit of P/Halley are used to determine comet size. Only 2 straight lines are sufficient for a description of the behavior of the comet, n = 0.7 for 11 to 7.6 AU and n = 5.8 for 7.6 to 2.5 AU. At the time of the discovery P/Halley was brighter than predicted by the standard law and the discovery of P/Halley on Oct. 1982 was made possible by its brightening. On the basis of the estimate of a projected area of 100 sq km, and of brightness 24.1m at the extreme distance, albedo = 0.055 has been derived. This value of albedo is used to calculate the radii of short-period comets. One possibility to explain the small difference between sizes of long-period and short-period comets, is that the mass loss causes the decrease of density of a nucleus.
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