On the Spin State of the Asteroid 433 Eros

Details On the Spin State of the Asteroid 433 Eros On the Spin State of the Asteroid 433 Eros

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.1001h&link_type=abstract

American Astronomical Society, DDA meeting #30, #10.01; Bulletin of the American Astronomical Society, Vol. 30, p.1145

Astronomy and Astrophysics

Astronomy

Scientific paper

From lightcurve photometry, the asteroid 433 Eros is cigar-shaped (i.e., almost a prolate, biaxial ellipsoid with its short equatorial and polar axes nearly identical. This raises an interesting possibility regarding its unforced spin state. If the two larger moments of inertia are exactly equal, the stable rotation pole direction in body-fixed coordinates is undefined, and perturbations which would normally induce a polar motion analogous to the Earth's Chandler wobble instead will induce a slow constant migration of the body-fixed pole location around the ''waist'' of the ellipsoid. For only a small difference in the two larger moments of inertia, the polar motion follows an ellipsoidal trajectory of axis ratio [ ((C-A)A)/((C-B)B)% right ] (1/2) , and a precession frequency [ ((C-A)(C-B))/(AB)% right ] (1/2) omega , where omega is the axial spin frequency and % A

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