Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..288f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 288-296. Research supported by the Consejo de Des
Astronomy and Astrophysics
Astronomy
8
Chronology, Encke Comet, Halley'S Comet, Astronomical Models, Astronomical Photometry, Brightness Distribution, Comets, Age, Evolution, Halley, Encke, Calculations, Models, Parameters, Absolute Magnitude, Photometry, Earth-Based Observations, Comet Nuclei, Size, Mass, Procedure, Data, Astronomy
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. Both comets age significantly, and the authors calculate the Extinction Dates (ED): 3800±1000 for comet Halley and 2060±15 for Encke. Using two accurate formulas, they obtain the fraction of active surface area ≡5% for comet Halley, and ≡0.02% for Encke. This shows that comets die from suffocation by the dust layer on their surfaces (Shulman, 1972). The diameter of comet Encke has been calculated, and it is 6.2±2.5 km.
Ferrin Ignacio
Gil Carlos
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