Photometric survey of the very small near-Earth asteroids with the SALT telescope. II. Discussion of YORP

Details Photometric survey of the very small near-Earth asteroids with the SALT telescope. II. Discussion of YORP Photometric survey of the very small near-Earth asteroids with the SALT telescope. II. Discussion of YORP

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...509a..95k&link_type=abstract

Astronomy and Astrophysics, Volume 509, id.A95

Astronomy and Astrophysics

Astrophysics

2

Techniques: Photometric, Minor Planets, Asteroids: General

Scientific paper

Aims: A possibility of detection of the YORP effect in the population of the very small near-Earth asteroids is discussed. It is probable that due to their significant thermal conductivity, those of the objects which are on low inclination orbits experience a continuous spin-up/spin-down without the typical YORP cycles, and their spin axes are moved towards obliquities of 0° and 180°. Methods: For all rapidly rotating near-Earth asteroids observed with SALT, as well as other such objects for which periods are known, future observing possibilities are identified. A statistically derived, approximate relation for the YORP spin-up/spin-down is then utilized to check which of the considered asteroids can be potentially used to detect this effect. Results: It was found that for two asteroids, 2000 HB24 (if successfully recovered in 2014) and 1998 KY26, rotation period changes due to YORP should be detectable in the future. A determination of obliquities of two other objects, 2001 AV43 and 2006 XY should also be possible. For the latter constraints on its pole position are obtained suggesting a prograde rotation and the spin axis obliquity ɛ ≤ 50°.

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