Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...220..301h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 220, no. 1-2, Aug. 1989, p. 301-305.
Astronomy and Astrophysics
Astronomy
5
Comet Nuclei, Emission Spectra, Solar Orbits, Cosmic Dust, Halley'S Comet, Magnitude, Sunlight, Comets, Comet Nuclei, Emissions, Astronomy, Brightness, Distance, Gases, Dust, Calculations, Parameters, Halley, Size
Scientific paper
The ability of a comet to reflect and reradiate sunlight varies as a function of heliocentric distance, r(AU), and is usually found to be proportional to r to the -n, where n is known as the activity index. When a comet is close to the sun, the changes that have been observed in the activity index from apparition to apparition, and between the pre- and postperihelion phases of the orbit, could have a simple physical as well as a chemical cause. It is suggested that the temporal variation in the area of the nucleus that is actively emitting gas and dust is important in this context. For example, the observed postperihelion activity index of Comet Halley is 3.42 + or - 0.13.
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