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 a sufficient number of observations is available .
We present thermophysical modeling results of observations from the 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 multi-dimensional parameter space of the fit .
We find an effective spherical diameter for Phaethon of 4.6 ^ { +0.2 } _ { -0.3 } km , a geometric albedo of p _ { V } = 0.16 \pm 0.02 , and a thermal inertia \Gamma = 880 ^ { +580 } _ { -330 } , 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 \pm 0.4 ~ { } km and a geometric albedo of p _ { V } = 0.14 \pm 0.09 .