Delay-Doppler and Radar-Interferometric Imaging of the Near-Earth Asteroid 2008 EV5

Details Delay-Doppler and Radar-Interferometric Imaging of the Near-Earth Asteroid 2008 EV5 Delay-Doppler and Radar-Interferometric Imaging of the Near-Earth Asteroid 2008 EV5

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4310b&link_type=abstract

American Astronomical Society, DPS meeting #41, #43.10

Astronomy and Astrophysics

Astronomy

Scientific paper

Very-Long-Baseline Interferometry (VLBI) provides the highest angular resolution of any astronomical imaging technique. VLBI-radar plane-of-sky imaging of near-Earth asteroids can provide astrometry, relative orbits of binaries, unambiguous shapes, and maps of surface properties well beyond conventional delay-Doppler imaging, for a subset of Arecibo radar targets.
2008 EV5 was discovered by the Mt. Lemmon Survey on Mar 4 2008, and approached to within 8.4 lunar distances on 2008 Dec 23. We observed it with delay-Doppler imaging at Goldstone during 2008 Dec 16-23 and at Arecibo during Dec 23-27. On Dec 23 & 24, we also observed with Arecibo CW transmissions and the VLBA and Green Bank receiving.
The delay-Doppler data provide 7.5-m spatial resolution, showing that EV5 is a roughly 450 m spheroid, with a slight equatorial ridge and a prominent concavity (150-200 m across). However, the delay-Doppler data alone provide two mirror solutions for the asteroid's pole direction. The two pole directions predict opposite Yarkovsky accelerations, producing a several million kilometer offset in the asteroid's trajectory by 2170. The VLBA+GBT plane-of-sky images have 100 m resolution. We are currently combining the delay-Doppler and VLBI data and will report our results.
This material is based partially on work supported by NASA's Science Mission Directorate Research and Analysis Programs. The VLBA is operated by Associated Universities for the NSF. Arecibo Observatory is run by Cornell for the NSF. M.W.B. was supported by the Hertz Foundation.

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