论文标题
对潜在危险的小行星（99942）apophis的新观察
NEOWISE Observations Of The Potentially Hazardous Asteroid (99942) Apophis
论文作者
论文摘要
在行星碰撞的情况下，大型危险的小行星（PHA）能够造成全球灾难。因此，对这种物体的物理特征的快速评估对于确定其潜在风险量表至关重要。我们将近地小行星（99942）视为在2020 - 2021年的近距离接触期间，是一个新发现的物体，作为模拟行星防御运动的一部分。该对象是由近地物体宽大红外调查探索器（Neowise）检测到的，并使用热物理建模和热物理建模分析了两个活性带（3.4 $ $ $ m和4.6 $ $ m）收集的数据。 Our results indicate that Apophis is an elongated object with an effective spherical diameter D$_{eff}$ = 340 $\pm$ 70 m, a geometric visual albedo p$_{V}$ = 0.31 $\pm$ 0.09, and a thermal inertia $Γ$ $\sim$ 150 - 2850 JM $^{ - 2} $ s $^{ - 0.5} $ k $^{ - 1} $，最佳拟合值为550 jm $^{ - 2} $ s $ s $ s $^{ - 0.5} $ k $^{ - 1} $。 Neowise的“发现”观察结果表明，（99942）Apophis是一种潜在的危险小行星，可能在区域一级而不是全球造成损害。
Large potentially hazardous asteroids (PHAs) are capable of causing a global catastrophe in the event of a planetary collision. Thus, rapid assessment of such an object's physical characteristics is crucial for determining its potential risk scale. We treated the near-Earth asteroid (99942) Apophis as a newly discovered object during its 2020-2021 close-approach as part of a mock planetary defense exercise. The object was detected by the Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE), and data collected by the two active bands (3.4 $μ$m and 4.6 $μ$m) were analyzed using thermal and thermophysical modeling. Our results indicate that Apophis is an elongated object with an effective spherical diameter D$_{eff}$ = 340 $\pm$ 70 m, a geometric visual albedo p$_{V}$ = 0.31 $\pm$ 0.09, and a thermal inertia $Γ$ $\sim$ 150 - 2850 Jm$^{-2}$s$^{-0.5}$K$^{-1}$ with a best-fit value of 550 Jm$^{-2}$s$^{-0.5}$K$^{-1}$. NEOWISE "discovery" observations reveal that (99942) Apophis is a potentially hazardous asteroid that would likely cause damage at a regional level and not a global one.
