Sizes, aging rates and extinction dates, of Comets Halley and Encke

Details Sizes, aging rates and extinction dates, of Comets Halley and Encke Sizes, aging rates and extinction dates, of Comets Halley and Encke

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.427f&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 427-432 (SEE N

Physics

Chronology, Comet Nuclei, Encke Comet, Extinction, Halley'S Comet, Size Determination, Magnitude, Space Observations (From Earth), Visual Observation

Scientific paper

The aging rates of comets Halley and Encke, have been derived using only naked eye observations. In this way all instrumental effects have been avoided. However still both data sets had to be corrected for the "Twilight Effect". The authors used a reliable light curve for each comet, that permitted the evaluation of the absolute magnitude m0 with no extrapolation. Their results are listed. Both comets age significantly, and the authors calculate the extinction dates: 3800±1000 for comet Halley and 2060±15 for Encke. Using two accurate formulas, they obtain the fraction of surface area active: ≡10% for comet Halley, and ≡0.02% for Encke. The diameter of comet Encke has been calculated, and it is ≡6.2±2.5 km.

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