Radar Observations of 2005 YU55's Flyby of Earth

Details Radar Observations of 2005 YU55's Flyby of Earth Radar Observations of 2005 YU55's Flyby of Earth

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943211t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #432.11

Astronomy and Astrophysics

Astronomy

Scientific paper

Arecibo S-band (2380-MHz, 13-cm) radar observations in April 2010 determined that near-Earth asteroid 2005 YU55 is a dark, spherical object about 400 meters in diameter with a slow rotation period of roughly 18 hours. Radar astrometry provided by Arecibo during the 2010 apparition substantially improved the orbit of 2005 YU55, eliminating it as a potential Earth impactor in the near future and predicting the proximity of the November 2011 flyby, which, at a minimum of 0.85 lunar distances, was the closest known flyby of Earth by an object this size in the last 35 years. Such a close flyby provided an extraordinarily strong radar target and an invaluable scientific opportunity. Thus, a comprehensive radar observing campaign for 2005 YU55 was undertaken that utilized the Arecibo S-band and Goldstone X-band (8560-MHz, 3.5-cm) radar systems as well as the Green Bank Telescope and elements of the Very Long Baseline Array. Radar observations during the November 2011 flyby allowed for finer range and frequency resolution than the April 2010 observations by Arecibo alone and, therefore, will refine the size, shape, spin, surface and reflection properties, future trajectory, and impact hazard assessment of 2005 YU55.

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