A Productive YORP Year

Details A Productive YORP Year A Productive YORP Year

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.0509m&link_type=abstract

American Astronomical Society, DPS meeting #39, #5.09; Bulletin of the American Astronomical Society, Vol. 39, p.417

Astronomy and Astrophysics

Astronomy

Scientific paper

Although the implications of the Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect have been widely perceived as important for asteroid dynamics [1], the lack of a direct YORP detection was troublesome, until recently.
Last year at this meeting a manuscript describing a robust YORP detection was circulated and discussed informally. Two publications emerged [2,3]. A change in the spin rate of asteroid (54509) was found in [2] by measuring the rate of change in lightcurve periods, and in [3] by a different analysis of the same data. The amplitude of the observed acceleration was shown to be in rough agreement with YORP predictions [3] and asteroid (54509) received the name YORP.
Shortly after the meeting work started on the detection of YORP on (1862) Apollo [4]. A third YORP detection on asteroid (25143) Itokawa is now in hand [5]. YORP seems pervasive and significant enough that it complicates shape inversion efforts when data sets span several years, especially for small asteroids.
Since the last meeting, work has continued on improving the formulation and modeling of the YORP effect acting on single asteroids [6], on examining the possible formation of binaries with YORP [7,8], and on understanding the effect of YORP in the best characterized binaries [9,10].
A summary of recent advances in the field will be presented at the meeting.
[1] W. Bottke et al., AREPS 34, 2006.
[2] S. C. Lowry et al., Science 316, 2007.
[3] P. A. Taylor et al., Science 316, 2007.
[4] M. Kaasalainen et al., Nature 446, 2007.
[5] K. Kitazato et al., A&A, submitted.
[6] D. Scheeres et al., Icarus 188, 2007.
[7] M. Cuk, ApJL 659, 2007.
[8] P. Pravec and A. Harris, Icarus, in press.
[9] S. Ostro et al., Science 314, 2006.
[10] D. Scheeres et al., Science 314, 2006.

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