Photometric survey of the very small near-Earth asteroids with the SALT telescope
II. Discussion of YORP
Astronomical Observatory, Adam Mickiewicz University,
Słoneczna 36, 60-286 Poznań, Poland e-mail: email@example.com
Accepted: 4 November 2009
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 and .
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 .
Key words: techniques: photometric / minor planets, asteroids: general
© ESO, 2010