Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dps....34.2711p&link_type=abstract
American Astronomical Society, DPS Meeting #34, #27.11; Bulletin of the American Astronomical Society, Vol. 34, p.888
Astronomy and Astrophysics
Astronomy
Scientific paper
We will show preliminary results from a program of long-term observation of the dust coma activity of bright comets. One and half years of observation of 32 selected comets in B, V, R, I filters are used for the study of the physical properties and the dust activity of their comae at a range of heliocentric distances from 0.99 to 8.61 AU. This enables us to compare the activity of different cometary nuclei at similar solar radiation conditions. As shown in the Table, the selected comets belong to different cometary populations from the point of view of their active age (near parabolic orbits versus short-period orbits, outbursts of brightness, disruption of nuclei) and orbital parameters (the eccentricity from 0.04 to 1.01 AU, the perihelion distance from 0.34 to 8.24 AU). The knowledge of physical properties of cometary nuclei and coma are very important to our understanding of the environment in the outer solar system during the era of formation. The comet dataset of 1128 images will enable us to study thermal evolution of the small dust particles, their dynamical parameters and size distribution as a function of time and grain size at different heliocentric distances. Our future goal is to model the near-nucleus particle region using a Finston-Probstein dust model. Since our observations are still in progress at this time we will present only preliminary results of brightness and color changes for several selected bright comets.
Meech Karen Jean
Pittichova Jana
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