Estimating the Degree of Space Weathering on Koronis Family Asteroids Using ECAS

Details Estimating the Degree of Space Weathering on Koronis Family Asteroids Using ECAS Estimating the Degree of Space Weathering on Koronis Family Asteroids Using ECAS

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.2001d&link_type=abstract

American Astronomical Society, DPS meeting #39, #20.01; Bulletin of the American Astronomical Society, Vol. 39, p.447

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Space weathering processes are those which act to modify the spectral properties of airless bodies like asteroids. However, there is currently no reliable means of estimating the degree of weathering that has taken place on a particular body. Hiroi et al. [36th LPSC, abstract no. 1396, 2006] recently proposed a new method to do this with an ECAS-type filter system. They suggest that as the degree of space weathering at the surface of a body progresses, negative inflections in the spectrum at 420 nm and 550 nm will tend towards zero and the spectrum will become smoother. In May 2007, we began a series of ground-based telescopic observations of Koronis family asteroids in four ECAS colors to test this method. We aim to determine whether ECAS is indeed a useful means of estimating the degree of space weathering on an object and if so, whether the results for the Koronis family can be extrapolated to a broader population. In addition, since the relative ages of the family members are known, an indicator of the amount of weathering that has taken place within Koronis may also provide a means to better constrain the time scale of weathering processes. Here, we present the preliminary results of our observations.

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