Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.0503t&link_type=abstract
American Astronomical Society, DPS meeting #39, #5.03; Bulletin of the American Astronomical Society, Vol. 39, p.416
Astronomy and Astrophysics
Astronomy
Scientific paper
Arecibo S-band (2380 MHz, 13 cm) and Goldstone X-band (8560 MHz, 3.5 cm) radar observations from 2001, 2004, and 2005 [1] along with precise optical observations [2] reveal that the observed change in spin rate of near-Earth asteroid (54509) YORP, formerly 2000 PH5, is due to the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect, a torque due to sunlight. The increase in sidereal spin rate of (2.0 ± 0.2) x 10-4 deg/day2 [2], equivalently a shortening of the sidereal spin period by just over one millisecond per year, is in reasonable agreement with theoretical predictions for the YORP acceleration of a body with the radar-determined size, shape, and spin state of asteroid (54509) YORP. The detection of asteroid spin-up supports the YORP effect as an explanation for the anomalous distribution of spin rates for asteroids under 10 km in diameter and as a binary formation mechanism.
[1] P. A. Taylor et al., Science, 316, 2007.
[2] S. C. Lowry et al., Science, 316, 2007.
Benner Lance A.
Fitzsimmons Alan
Giorgini Jon D.
Lowry Stephen C.
Magri Christopher
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