Radar Observations and the Shape of 2008 EV5: Ridges and Craters on Near-Earth Asteroids

Details Radar Observations and the Shape of 2008 EV5: Ridges and Craters on Near-Earth Asteroids Radar Observations and the Shape of 2008 EV5: Ridges and Craters on Near-Earth Asteroids

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5705b&link_type=abstract

American Astronomical Society, DPS meeting #42, #57.05; Bulletin of the American Astronomical Society, Vol. 42, p.1081

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The near-Earth asteroid 2008 EV5 was discovered by the Mt. Lemmon Survey on March 4 2008, and approached to within 8.4 lunar distances in December 2008, when it was a very strong radar target. We observed EV5 with the Arecibo and Goldstone planetary radars and the Very Long Baseline Array, and previously described those observations and obtaining EV5's pole direction. We have now completed a detailed model of EV5's shape.
The Arecibo delay-Doppler data provided 7.5-m spatial resolution, showing that EV5's overall shape is a 400 ± 50 m spheroid. The most prominent surface feature is a ridge parallel to the asteroid's equator that is broken by a concavity 150 m in diameter. Otherwise the asteroid's surface is shows few decameter-scale features and is notably smooth - our shape model has an average surface slope of <15º. EV5's radar and optical albedos are consistent with either rocky or stony-iron composition.
EV5's ridge is similar to structure seen on the rubble-pile near-Earth asteroid (66391) 1999 KW4, and is consistent with YORP spin-up reconfiguring the asteroid during an episode of more rapid rotation. We interpret the concavity as an impact crater. Shaking during the impact should have erased smaller surface features and may explain the general lack of decameter-scale surface structure.

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