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- W2084112835 abstract "Optical lightcurves reported by J. R. Spenceret al.(1995,Icarus117, 71–89) and a radar-derived shape and spin-state model (R. S. Hudson and S. J. Ostro, 1995,Science270, 84–86) are used to estimate the Hapke parameters of the Earth-crossing Asteroid 4179 Toutatis. We find a particle single-scattering albedow= 0.261 ± 0.019, opposition surge widthh= 0.036 ± 0.023 and amplitudeB0= 1.20 ± 0.32, particle phase function asymmetry factorg= −0.29 ± 0.06, and macroscopic roughness parameter θ = 32 ± 8°. 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° to 121.4°. 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." @default.
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- W2084112835 date "1998-10-01" @default.
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- W2084112835 title "Photometric Properties of Asteroid 4179 Toutatis from Lightcurves and a Radar-Derived Physical Model" @default.
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- W2084112835 doi "https://doi.org/10.1006/icar.1998.5991" @default.
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