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In August 2005, the near-Earth Asteroid 1992 UY4 made a close flyby, coming within 0.04 au of our planet. Between the dates of 1-10 August 2005, it was observed via delay-Doppler radar imaging by the Arecibo Observatory (2380 MHz, 13 cm) and the DSS-14 antenna at the Goldstone Deep Space Communications Complex (8560 MHz, 3.5 cm). The images achieve a resolution as fine as 7.5 m/pixel and reveal a lumpy and modestly asymmetric object. The images also revealed the presence of numerous large boulders/blocks on the surface of 1992 UY4. By using the modeling software SHAPE, which is standard in the field of asteroid radar imaging, and by using a visual examination of the models vs. radar images and the 2 statistic as a relative (but not absolute) probability metric, I found two potential pole directions: one at = 285 ± 10 , = -80 ± 10 , and one at = 110 ± 10 , = 75 ± 10 , the mirror direction. They represent a north-south ambiguity: 1992 UY4 may rotate either prograde or retrograde. I find that the models for the first pole direction better match the observations and I conclude that 1992 UY4 is most likely a retrograde rotator. I identified 18 boulder candidates on 1992 UY4’s surface based on inde-

Shape modeling and boulder napping of asteroid 1992 UY4.