Secular brightness decrease of periodic comets

Details Secular brightness decrease of periodic comets Secular brightness decrease of periodic comets

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...86...82k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 86, July 1990, p. 82-92.

Computer Science

12

Brightness Distribution, Comets, Secular Variations, Perihelions, Planetary Systems, Statistical Analysis, Comets, Periodic Comets, Brightness, Absolute Magnitude, Comparisons, Statistical Analysis, Photometry, Optical Properties, Secular Variations, Timescale, Extinction

Scientific paper

Results are presented from a new evaluation of periodic comet photometric data, which are then extended on the basis of an approach assuming equilibrium between comet captures, ejections, and fades. For comets of perihelion distance less than 1.5 AU, a slow mean progressive fading of about 0.01 mag/revolution is exhibited. For perihelion distances greater than 1.5 AU, comets exhibit a mean progressive fading of about 0.04 mag/rev; this indicates a more effective formation of the dust mantle, which is hindered by the purging process if the comet comes closer to the sun. Ultimate or temporary extinctions are not preceded by an accelerating brightness decrease over more than one perihelion passage.

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