TY - CONF
T1 - Spin Rate of Asteroid (54509) YORP Increasing due to the YORP Effect
AU - Taylor, Patrick A.
AU - Margot, J. L.
AU - Vokrouhlicky, D.
AU - Scheeres, D. J.
AU - Pravec, P.
AU - Lowry, S. C.
AU - Fitzsimmons, A.
AU - Nolan, M. C.
AU - Ostro, S. J.
AU - Benner, L. A.
AU - Giorgini, J. D.
AU - Magri, C.
PY - 2007/10/1
Y1 - 2007/10/1
N2 - 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.
AB - 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.
M3 - Abstract
ER -