Is asteroid 951 Gaspra in a resonant obliquity state with its spin increasing due to YORP?

Details Is asteroid 951 Gaspra in a resonant obliquity state with its spin increasing due to YORP? Is asteroid 951 Gaspra in a resonant obliquity state with its spin increasing due to YORP?

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5065r&link_type=abstract

Journal of Geophysical Research (Planets), Volume 107, Issue E9, pp. 3-1, CiteID 5065, DOI 10.1029/2001JE001813

Physics

7

Planetology: Comets And Small Bodies: Orbital And Rotational Dynamics, Planetology: Comets And Small Bodies: Surfaces And Interiors, Planetology: Comets And Small Bodies: General Or Miscellaneous, Planetology: Solar System Objects: Asteroids And Meteoroids, Planetology: Solar System Objects: General Or Miscellaneous

Scientific paper

Asteroid 951 Gaspra appears to be in an obliquity resonance with its spin increasing due to the Yarkovsky-O'Keefe-Radzievskii-Paddack effect (YORP effect, for short). Gaspra, an asteroid 5.8 km in radius, is a prograde rotator with a rotation period of 7.03 hours. A 3 × 106 year integration indicates that its orbit is stable over at least this time span. From its known shape and spin axis orientation and assuming a uniform density, Gaspra's axial precession period turns out to be nearly commensurate with its orbital precession period, which leads to a resonance condition with consequent huge variations in its obliquity. At the same time, its shape is such that the YORP effect is increasing its spin rate. YORP may be a reason for small asteroids entering resonances in the first place: they speed up or slow down and fall into resonances. The continued action of YORP probably ultimately causes asteroids to leave resonances, so that they are quasi-stable states.

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