Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010acasn..51..384l&link_type=abstract
Acta Astronomica Sinica, vol. 51, no.4, p.384-394
Other
Asteroids: Centaurs, Celestial Mechanics, Methods: Statistical
Scientific paper
In order to research the statistical characters and physical significance of the color indexes and orbital parameters of Centaurs, we analyse the correlations of color-color and color-orbital parameter by using statistical methods according to the known color indexes of 39 Centaurs and their respective orbital parameters. We find that the correlations of B-V vs. V-R, V-R vs. R-I, B-V vs. R-I and B-R vs. R-I are all strong. Centaurs show distinct red-blue double colors. The cut-off point of B-R is about 1.4. The distributions of the color indexes of Centaurs follow normal distribution. Further more, we find that the color distribution of blue Centaurs is more concentrated than that of red ones. The aggregation of the colors of blue Centaurs may be due to the small differences in ice mantles or cometary activities. While the dispersion of the colors of red Centaurs may result from the large differences in the composition, proportion and distribution of organic matters on their surfaces. For the correlations between colors and orbital parameters, we find weak correlations of B-V vs. orbital inclination i and V-R vs. orbital semi-major axis a. It may indicate that Centaurs with larger i or smaller a, which means more collisions and changes in environment, tend to form blue surfaces. In contrast, Centaurs with smaller i or larger a, which means less collisions and changes in environment, tend to keep their original red surfaces. There is no evidence for other correlations between colors and orbital parameters.
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