Fraction of Contact Binary Trojan Asteroids

Details Fraction of Contact Binary Trojan Asteroids Fraction of Contact Binary Trojan Asteroids

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6509m&link_type=abstract

American Astronomical Society, DPS meeting #38, #65.09; Bulletin of the American Astronomical Society, Vol. 38, p.616

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a sparsely-sampled lightcurve survey conducted to determine the fraction of contact binaries among the Trojan asteroids of Jupiter. Sparse sampling was used to assess the photometric range of 114 Jovian Trojan asteroids. Those with the largest ranges were targeted for detailed follow-up observations. Here, we present the discovery of two candidate contact binary asteroids. These two asteroids display large candidate lightcurve ranges ( 1 magnitude) and long rotation periods (< 4 rotations per day). Using Roche binary equilibrium models, we find low densities of
600 kg/m3 and 800 kg/m3, suggesting porous interiors. The fraction of contact binaries is estimated to be between 10% and 15%, similar to the fraction in the Kuiper Belt. The total binary fraction (including both wide and close pairs) must be higher.

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