Parameter-Study Of The Thermal Yarkovsky Effect Acting On Neas

Details Parameter-Study Of The Thermal Yarkovsky Effect Acting On Neas Parameter-Study Of The Thermal Yarkovsky Effect Acting On Neas

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1312p&link_type=abstract

American Astronomical Society, DPS meeting #42, #13.12; Bulletin of the American Astronomical Society, Vol. 42, p.1055

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the relevant parameters for the thermal Yarkovsky effect acting on Near-Earth Asteroids (NEAs), specifically the rotation period and rotation axis. The study uses a quasi 3-D thermal model to derive the temperature map over the surface of the asteroid, and the thermal thrust is calculated. The model (Prialnik et al. 2004, Rosenberg and Prialnik 2006), uses an implicit scheme to numerically solve the equations that describe the asteroid and its thermal evolution. The results show how the thermal thrust is stronger for fast-rotating asteroids, as heat is emitted from their surface on the evening side, increasing the tangential component of the thermal thrust. Moreover, we show the differences in the thermal thrust between asteroids with different perihelion distances, and how this can explain the observed distribution of asteroids in the inner Solar System on the spin-perihelion plane. Our results suggest that many asteroids within the inner Solar System may have retrograde spins.
Acknowledgements: D. Polishook is grateful for an Ilan Ramon doctoral scholarship from the Israeli Ministry of Science.

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