Phase dependencies of cometary visual light curves

Details Phase dependencies of cometary visual light curves Phase dependencies of cometary visual light curves

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..769f&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Comets, Light Curves

Scientific paper

Generally the integrated flux produced by a comet on Earth is the sum of the fluxes produced by gas and dust in the cometary atmosphere and by the solid cometary nucleus. The contribution from the nucleus to the integrated comet brightness is extremely small and it can be ignored. The contributions from the gas and dust are functions of the comet heliocentric distance. But the flux from dust also depends on the phase angle. Therefore the phase dependence of brightness can be determined in principle from the visual integrated light curves of comets whose dust-scattered radiation accounts for a considerable fraction of the total radiation. The statistical significant influence of phase dependencies on the light curves of eight comets had been found. The values of phase coefficient of these comets had been determined. For three comets the values of phase coefficient are negative. For other five comets the mean value of phase coefficients is 0.047 m/grad that practically coincides with mean value of phase coefficients of C-type asteroids (0.041 m/grad). Apparently the phase dependencies of these comets determines by dark carbon particles in their atmospheres.

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