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A new calibration of the semi-empirical photometric theory for Halley and other comets

Authors
Journal
Advances in Space Research
0273-1177
Publisher
Elsevier
Publication Date
Volume
4
Issue
9
Identifiers
DOI: 10.1016/0273-1177(84)90024-3

Abstract

Abstract A massive new body of data, comprised of spectrophotometry of 17 comets by Newburn and Spinrad, has now become available for calibration of the basic theory, the Semi-Empirical Photometric Theory, used for modelling of Comet Halley. A redetermination of the constant R and the function δ has been made, and no change is needed. Improved mixing ratios given as a function of heliocentric distance also permit an improvement in the constants of the visual photometric model presented at COSPAR XXIV. A new light curve for Halley and a lower dust to gas ratio prove to make roughly compensating changes in dust densities.

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