Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..135..451h&link_type=abstract
Icarus, Volume 135, Issue 2, pp. 451-457.
Physics
7
Scientific paper
Optical lightcurves reported by J. R. Spencer et al. (1995, Icarus 117, 71-89) and a radar-derived shape and spin-state model (R. S. Hudson and S. J. Ostro, 1995, Science 270, 84-86) are used to estimate the Hapke parameters of the Earth-crossing Asteroid 4179 Toutatis. We find a particle single-scattering albedo w = 0.261 +/- 0.019, opposition surge width h = 0.036 +/- 0.023 and amplitude B_0 = 1.20 +/- 0.32, particle phase function asymmetry factor g = -0.29 +/- 0.06, and macroscopic roughness parameter theta = 32 +/- 8 deg. The synthetic lightcurves generated with this model provide a good fit (rms residual = 0.12 mag) to the optical data which span phase angles from 0.2 deg to 121.4 deg. The addition of optical data in the modeling process results in a slight refinement of the radar-derived estimate of the parameters that describe Toutatis's non-principal-axis spin state. Analysis of the opposition surge width in light of recent radar results supports the hypothesis that a significant fraction of Toutatis's surface is covered by a fine particulate regolith.
Hudson Raymond Scott
Ostro Steven J.
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