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In this paper, we investigate thermophysical characteristics of near-Earthasteroid (341843) 2008 EV5, based on our improved Advanced Thermal PhysicalModel (ATPM) by considering the contribution of sunlight-reflection for roughsurface, along with four wavebands observations from Wide-field Infrared SurveyExplorer (WISE) and the radar-derived shape model. Here we derive that 2008 EV5has a relatively low thermal inertia of $\Gamma=110 _{-12}^{+40}\rm~J m^{-2}s^{-1/2} K^{-1}$ but a high roughness fraction. The geometric albedo andeffective 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 inertiaindicates that 2008 EV5 may have undergone sufficient space weathering oversecular evolution. The high roughness may have resemblances to the appearancesof Bennu and Ryugu recently observed by spacecrafts, where a great number ofboulders are widely distributed on the asteroid's surface. Moreover, wenumerically perform 1000 backward simulations of 2008 EV5's cloned orbitswithin 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 themean grain size of the surface ranges from 0.58 to 1.3 mm, and infer that it isunlikely to find water ice on most area of 2008 EV5, but there may exist waterice on high-latitudes near polar region.

the astronomical journal

Revisiting Advanced Thermal Physical Model: New Perspectives on  Thermophysical Characteristics of (341843) 2008 EV5 from Four-bands WISE Data  with Sunlight-Reflection Model