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- W2949098330 abstract "We investigated the physical and thermal properties of 65 Cybele, one of the largest main-belt asteroids. Based on published and recently obtained thermal infrared observations, including ISO measurements, we derived through thermophysical modelling (TPM) a size of km (±4%) and an geometric visible albedo of . Our model of a regolith covered surface with low thermal inertia and “default roughness describes the wavelengths and phase angle dependent thermal effects very well. Before/after opposition effect and beaming behaviour can be explained in that way. We found a constant emissivity of 0.9 at wavelengths up to about 100 μm and lower values towards the submillimetre range, indicating a grain size distribution dominated by 200 μm particle sizes. The spectroscopic analysis revealed an emissivity increase between 8.0 and 9.5 μm. We compared this emissivity behaviour with the Christiansen features of carbonaceous chondrite meteorites, but a conclusive identification was not possible. A comparison between the Standard Thermal Model (STM) and the applied TPM clearly demonstrates the limitations and problems of the STM for the analysis of multi-epoch and -wavelengths observations. While the TPM produced a unique diameter/albedo solution, the calculated STM values varied by ±30% and showed clear trends with wavelength and phase angle. 65 Cybele can be considered as a nice textbook case for the thermophysical analysis of combined optical and thermal infrared observations." @default.
- W2949098330 created "2019-06-27" @default.
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- W2949098330 date "2004-04-01" @default.
- W2949098330 modified "2023-10-05" @default.
- W2949098330 title "65 Cybele in the thermal infrared: Multiple observations and thermophysical analysis" @default.
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- W2949098330 doi "https://doi.org/10.1051/0004-6361:20040025" @default.
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