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Retrograde spins of near-Earth asteroids from the Yarkovsky effect
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Journal Article
Retrograde spins of near-Earth asteroids from the Yarkovsky effect
2004
Overview
Dynamical resonances in the asteroid belt are the gateway for the production of near-Earth asteroids
1
(NEAs). To generate the observed number of NEAs, however, requires the injection of many asteroids into those resonant regions. Collisional processes have long been claimed as a possible source
1
,
2
,
3
, but difficulties with that idea have led to the suggestion that orbital drift arising from the Yarkovsky effect
4
,
5
,
6
,
7
dominates the injection process
8
,
9
,
10
. (The Yarkovsky effect is a force arising from differential heating—the ‘afternoon’ side of an asteroid is warmer than the ‘morning’ side.) The two models predict different rotational properties of NEAs: the usual collisional theories
2
are consistent with a nearly isotropic distribution of rotation vectors, whereas the ‘Yarkovsky model’ predicts an excess of retrograde rotations. Here we report that the spin vectors of NEAs show a strong and statistically significant excess of retrograde rotations, quantitatively consistent with the theoretical expectations of the Yarkovsky model.
Publisher
Nature Publishing Group UK,Nature Publishing,Nature Publishing Group
Subject
