The Lightcurve Of 4179-Toutatis - Evidence For Complex Rotation

Spencer, J.R. and Akimov, L.A. and Angeli, C. and Angelini, P. and Barucci, M.A. and Dorokhov, N.I. and Desanctis, M.C. and Dotto, E. and Ezhkova, O.B. and Fulchignoni, M. and Green, S. and Harris, A.W. and Howell, E.S. and Hudecek, T. and Kalashnikov, A.V. and Kobelev, V.V. and Korobova, Z.B. and Zellner, B. (1995) The Lightcurve Of 4179-Toutatis - Evidence For Complex Rotation. Icarus, 117 (1). pp. 71-89. ISSN 0019-1035. (The full text of this publication is not available from this repository)

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The Apollo asteroid 4179 Toutatis passed within 0.0242 AU of Earth in December 1992, and photometry was obtained by observers from at least 25 sites around the world, at solar phase angles between 121 degrees and 0.2 degrees. The phase curve is well described in the H, G system with a mean H of 15.3 and a slope parameter G of 0.10 +/- 0.10. However, the rotational lightcurve is very unusual. The amplitude is large (1.2 magnitudes) and the rotation period is extremely long (several days). Most remarkably, the lightcurve does not appear to be periodic: it is unlikely that a single rotation period can account for the lightcurve even when the rapidly changing viewing and illumination geometry during the close Earth approach is taken into account, though strong lightcurve minima recurred approximately every 7.3 days. The likely explanation is that Toutatis has complex, tumbling, rotation with a characteristic period between 3 and 7 days. As noted by A. W. Harris (1994 Icarus 107, 209-211), the damping time scale from complex to simple rotation for a small, slowly rotating asteroid like Toutatis is so long that complex rotation is expected, but Toutatis is the first asteroid to show such strong observational evidence for complex rotation.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: I.T. Ekpo
Date Deposited: 31 Oct 2009 10:53
Last Modified: 31 Oct 2009 10:53
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