Asteroid Age Distributions determined by Space Weathering and Collisional Evolution Models

Details Asteroid Age Distributions determined by Space Weathering and Collisional Evolution Models Asteroid Age Distributions determined by Space Weathering and Collisional Evolution Models

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3909j&link_type=abstract

American Astronomical Society, DPS meeting #42, #39.09; Bulletin of the American Astronomical Society, Vol. 42, p.1034

Astronomy and Astrophysics

Astrophysics

Scientific paper

We provide evidence of consistency between asteroid ages determined from their dynamical evolution and their color evolution due to space weathering. The dynamical age of an asteroid's surface is estimated as the time since its last catastrophic disruption event which is a function of the object's diameter. The age of an S-complex asteroid's surface may also be determined from its color using a space weathering model. We used a sample of 95 S-complex asteroids from SMASS and obtained their absolute magnitudes and u,g,r,i,z filter magnitudes from SDSS. The absolute magnitudes yield a size-derived age distribution. The u,g,r,i,z filter magnitudes lead to the principal component color which yields a color-derived age distribution by inverting our color-age relationship, an enhanced version of the `dual tau' space weathering model of Willman et al. 2010. We fit the size-age distribution to an 'enhanced dual tau' model and found characteristic weathering and gardening times of 2050+/-80 Myr and 4400+700-500 Myr respectively. The fit also suggests an initial principal component color of -0.05+/-0.01 for fresh asteroid surface with a maximum possible change of the probable color due to weathering of dPC1 = 1.34+/-0.04. Our predicted color of fresh asteroid surface matches the color of fresh ordinary chondritic surface of PC1 = 0.17+/-0.39.

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