再论先进的热物理模型：利用太阳光反射模型研究（341843）2008 EV5的四波段WISE数据
Revisiting Advanced Thermal Physical Model: New Perspectives on Thermophysical Characteristics of (341843) 2008 EV5 from Four-bands WISE Data with Sunlight-Reflection Model
摘要：
本文基于改进的先进热物理模型（ATPM），考虑粗糙表面对太阳光反射的贡献，结合宽视场红外巡天探测器（WISE）的四个波段观测数据和雷达形状模型，研究了近地小行星（341843）2008 EV 5的热物理特性。在这里，我们得出2008 EV 5具有相对低的热惯性$Γ=110 _{-12}^{+40}\rm~J m^{-2} s^{-1/2} K^{-1}$，但粗糙度分数高。然后，几何反射率和有效直径分别被约束为$p_v=0.095_{-0.003}^{+0.016}$和$D_{\rm eff}=431_{-33}^{+6}\rm~m$。低的热惯性表明，2008年EV 5可能经历了足够的长期演变的空间风化。高粗糙度可能与最近航天器观测到的Bennu和Ryugu的外观相似，其中大量的巨石广泛分布在小行星表面。此外，我们数值上执行1000个反向模拟2008年EV 5的克隆轨道在1万年内探索其起源，并提出了$\sim6.1\%$的概率，小行星起源于主带。最后，我们估计了2008年EV 5地表的平均粒径在0.58 ~ 1.3mm之间，推测在大部分地区不可能发现水冰，但在极区附近的高纬度地区可能存在水冰。
英文摘要：
In this paper, we investigate thermophysical characteristics of near-Earth asteroid (341843) 2008 EV5, based on our improved Advanced Thermal Physical Model (ATPM) by considering the contribution of sunlight-reflection for rough surface, along with four wavebands observations from Wide-field Infrared Survey Explorer (WISE) and the radar-derived shape model. Here we derive that 2008 EV5 has a relatively low thermal inertia of $Γ=110 _{-12}^{+40}\rm~J m^{-2} s^{-1/2} K^{-1}$ but a high roughness fraction. The geometric albedo and effective diameter are then constrained to be $p_v=0.095_{-0.003}^{+0.016}$ and $D_{\rm eff}=431_{-33}^{+6}\rm~m$, respectively. The low thermal inertia indicates that 2008 EV5 may have undergone sufficient space weathering over secular evolution. The high roughness may have resemblances to the appearances of Bennu and Ryugu recently observed by spacecrafts, where a great number of boulders are widely distributed on the asteroid's surface. Moreover, we numerically perform 1000 backward simulations of 2008 EV5's cloned orbits within 1 Myr to explore its origin, and present a probability of $\sim6.1\%$ that the asteroid originates from the main belt. Finally, we estimate that the mean grain size of the surface ranges from 0.58 to 1.3 mm, and infer that it is unlikely to find water ice on most area of 2008 EV5, but there may exist water ice on high-latitudes near polar region.
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