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arXiv 1310.6715astro-ph.EP
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根据WISE数据计算的近地小行星(341843)2008 EV5的热物理性质

Thermophysical properties of near-Earth asteroid (341843) 2008 EV5 from WISE data

V. Alí-Lagoa, L. Lionni, M. Delbo, B. Gundlach, J. Blum, J. Licandro

摘要:

目标。推导2008 EV $_5$(马可波罗-R任务建议的基线目标)的热惯性,并推断其表面颗粒大小的信息。方法.热惯性值是通过将小行星热物理模型与美国宇航局的广域红外巡天探测器(WISE)红外数据拟合获得的。从约束的热惯性和模型的热导率,占不同的值的包装分数(一种措施的压实程度的风化层颗粒),晶粒尺寸的推导。结果我们得到了一个有效直径$D = 370 \pm 6\,\mathrm{m}$,几何可见的自旋$p_V = 0.13 \pm 0.05$(假设$H=20.0 \pm 0.4$),和热惯性$Γ= 450 \pm 60$ J/m2/s(1/2)/K在1- $σ$水平的显着性,其逆行自旋极的解决方案。对于低压实度,风化层颗粒半径为$r = 6.6^{+1.3}_{-1.3}$ mm;对于最高堆积密度,风化层颗粒半径为$r = 12.5^{+2.7}_{-2.6}$ mm。

英文摘要:

Aims. To derive the thermal inertia of 2008 EV$_5$, the baseline target for the Marco Polo-R mission proposal, and infer information about the size of the particles on its surface. Methods. Values of thermal inertia are obtained by fitting an asteroid thermophysical model to NASA's Wide-field Infrared Survey Explorer (WISE) infrared data. From the constrained thermal inertia and a model of heat conductivity that accounts for different values of the packing fraction (a measure of the degree of compaction of the regolith particles), grain size is derived. Results. We obtain an effective diameter $D = 370 \pm 6\,\mathrm{m}$, geometric visible albedo $p_V = 0.13 \pm 0.05$ (assuming $H=20.0 \pm 0.4$), and thermal inertia $Γ= 450 \pm 60$ J/m2/s(1/2)/K at the 1-$σ$ level of significance for its retrograde spin pole solution. The regolith particles radius is $r = 6.6^{+1.3}_{-1.3}$ mm for low degrees of compaction, and $r = 12.5^{+2.7}_{-2.6}$ mm for the highest packing densities.

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