DESTINY +目标Phaethon和2005 UD观测的NEOWISE热物理模拟
Thermophysical modeling of NEOWISE observations of DESTINY+ targets Phaethon and 2005 UD
摘要：
只要有足够的观测数据，热物理模型就可以改进对小行星表面物理和热特性的限制，使其超出从更简单的热模型中可以推断出的范围。我们提出的热物理模拟结果的观测NEOWISE任务的两个近地小行星的目标的DESTINY+飞越任务：（3200）Phaethon和（155140）2005 UD。我们的模型假设一个旋转的，有坑的，球形的表面，并采用蒙特卡罗马尔可夫链来探索多维参数空间的拟合。我们发现一个有效的球形直径为Phaethon的$4.6^{+0.2}_{-0.3}~$公里，一个几何的$p_V=0.16\pm0.02$，和热惯性$Γ=880$ $^{+580}_{-330}$，使用五个时期的NEOWISE观测。最适合（155140）2005 UD的模型由于只有两个NEOWISE观测历元而受到较少的约束，给出的直径为$1.2\pm0.4~$ km，几何参数为$p_V=0.14\pm0.09$。
英文摘要：
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 $p_V=0.16\pm0.02$, and a thermal inertia $Γ=880$ $^{+580}_{-330}$, 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 $1.2\pm0.4~$km and a geometric albedo of $p_V=0.14\pm0.09$.
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