Is Asteroid 951 Gaspra in a Resonant Obliquity State with YORP Increasing Its Spin Rate?

Details Is Asteroid 951 Gaspra in a Resonant Obliquity State with YORP Increasing Its Spin Rate? Is Asteroid 951 Gaspra in a Resonant Obliquity State with YORP Increasing Its Spin Rate?

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.5405r&link_type=abstract

American Astronomical Society, DPS Meeting #33, #54.05; Bulletin of the American Astronomical Society, Vol. 33, p.1137

Astronomy and Astrophysics

Astronomy

Scientific paper

Asteroid 951 Gaspra appears to be in an obliquity resonance with its spin increasing due to the YORP effect. Gaspra, an asteroid 5.8 km in radius, is a prograde rotator with a rotation period of 7.03 hours. A 3 million year integration indicates 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 Yarkovsky-O'Keefe-Radzievskii-Paddack effect (YORP effect for short) is increasing its spin rate. The YORP cycle normally leads from spin-up to spin-down and then repeating the cycle; however, it appears possible that resonance trapping can at least temporarily interrupt the YORP cycle, causing spin-up until the resonance is exited. This behavior may partially explain why there is an excess of fast rotators among small asteroids. YORP may also be a reason for small asteroids entering resonances in the first place.

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