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We observed the near-Earth asteroid 2008 EV5 with the Arecibo and Goldstoneplanetary radars and the Very Long Baseline Array during December 2008. EV5rotates retrograde and its overall shape is a 400 /pm 50 m oblate spheroid. Themost prominent surface feature is a ridge parallel to the asteroid's equatorthat is broken by a concavity 150 m in diameter. Otherwise the asteroid'ssurface is notably smooth on decameter scales. EV5's radar and optical albedosare consistent with either rocky or stony-iron composition. The equatorialridge is similar to structure seen on the rubble-pile near-Earth asteroid(66391) 1999 KW4 and is consistent with YORP spin-up reconfiguring the asteroidin the past. We interpret the concavity as an impact crater. Shaking during theimpact and later regolith redistribution may have erased smaller features,explaining the general lack of decameter-scale surface structure.

Radar Observations and the Shape of Near-Earth Asteroid 2008 EV5