Consequences of the size determination of P/Halley by space probes on the scale of sizes of cometary nuclei

Physics

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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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