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Masiero, Joseph R.; Wright, E. L.; Mainzer, A. K.
The Astronomical journal, 09/2019, Letnik: 158, Številka: 3Journal Article
Thermophysical models allow for improved constraints on the physical and thermal surface properties of asteroids beyond what can be inferred from more simple thermal modeling, provided that a sufficient number of observations is available. We present thermophysical modeling results of observations from the Near-Earth Object WISE (NEOWISE) mission for two near-Earth asteroids which are the targets of the DESTINY+ flyby mission: (3200) Phaethon and (155140) 2005 UD. Our model assumes a rotating, cratered, spherical surface, and employs a Monte Carlo Markov Chain to explore the multidimensional parameter space of the fit. We find an effective spherical diameter for Phaethon of km, a geometric albedo of pV = 0.16 0.02, and a thermal inertia Γ = 880 , using five epochs of NEOWISE observations. The best model fit for (155140) 2005 UD was less well constrained due to only having two NEOWISE observation epochs, giving a diameter of 1.2 0.4 km and a geometric albedo of pV = 0.14 0.09.
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