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On the Sizes of Cometary Nuclei

Published online by Cambridge University Press:  14 August 2015

V. P. Konopleva  and
L. M. Shul'Man
V. P. Konopleva
Affiliation:
Main Astronomical Observatory, Ukrainian Academy of Sciences, Kiev, U.S.S.R.
L. M. Shul'Man
Affiliation:
Main Astronomical Observatory, Ukrainian Academy of Sciences, Kiev, U.S.S.R.

Abstract

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Three methods have been developed for determining the sizes of cometary nuclei. They are all based on the spotted model for an icy nucleus. The first method follows from the relationship between the icy (unshielded) area and the total absolute brightness, although the quantity determined is actually a function of the radius and the shielding coefficient. The second method is based on analysis of the secular brightness decrease and the assumption that it is possible to establish when a new surface layer of dust starts to form; in practice, this method is found to be applicable only in the cases of P/Pons-Winnecke and P/Tuttle. The third method is also based on the secular brightness decrease, and it requires some assumption about the volume fraction of dust in the nucleus.

Type
Part IV/Physical Processes in Comets
Information
Symposium - International Astronomical Union , Volume 45: The Motion, Evolution of Orbits and Origin of Comets , 1972 , pp. 277 - 282
Copyright
Copyright © Reidel 1972 

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