The global thermophysical properties of (433) Eros

The global thermophysical properties of (433) Eros
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(433) 爱神 (Eros) 的整体热物理性质

DOI:
10.1016/j.icarus.2022.114939
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发表时间:
2022
期刊:
影响因子:
3.2
通讯作者:
Rivkin, A.S.
Rivkin, A.S.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hinkle, M.L.;Howell, E.S.;Fernández, Y.R.;Magri, C.;Vervack, R.J.;Marshall, S.E.;Crowell, J.L.;Rivkin, A.S.

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我们提出了近地小行星(433)Eros的基于形状的旋转分辨热物理模型的结果,使用在2009年至2019年的18个夜晚(共25个磁盘集成光谱)在NASA红外望远镜设施(IRTF)收集的反射和近红外光谱。这些数据采样了各种观察几何形状,照明角度和旋转相位,因此使我们能够详细描述Eros表面的物理特性,特别是在NEAR Shoemaker使命没有测量的热近红外区域(λ > 3.5 μm)的波长。Eros的形状,自旋状态,密度,旋度,和其他物理性质的NEAR测量纳入我们的模型,离开热惯性和表面粗糙度作为自由参数。我们发现,100-150 J m−2K− 1 s-1/2的热惯性范围和0.3-0.4的粗糙度火山口分数,火山口开口角130°(等效单向均方根倾斜角32° +/− 4°),符合数据从18个光谱在1σ水平,但不符合其余7个光谱。这表明爱神星的热特性在其表面各不相同,这对于将遥感数据与航天器对近地小行星物理特性的测量联系起来具有重要意义。
We present results from a shape-based, rotationally-resolved thermophysical model of near-Earth asteroid (433) Eros, using reflected and near-IR spectra collected at the NASA Infrared Telescope Facility (IRTF) over 18 nights (25 disk-integrated spectra in total) from 2009 to 2019. The data sample a variety of viewing geometries, illumination angles, and rotational phases and therefore allow us to characterize Eros's surface physical properties in detail, particularly at wavelengths in the thermal near-IR regime (λ > 3.5 μm) that were not measured by the NEAR Shoemaker mission. Eros's shape, spin state, density, albedo, and other physical properties measured by NEAR were incorporated into our model, leaving thermal inertia and surface roughness as free parameters. We find that a thermal inertia range of 100–150 J m−2K−1s-1/2and a roughness crater fraction of 0.3–0.4 with crater opening angle 130° (equivalent adirectional rms slope angle of 32° +/− 4°) fit data from 18 spectra at the 1σ level, but do not fit the remaining 7 spectra. This suggests that Eros's thermal properties vary over its surface, which has important implications for linking remote sensing data to spacecraft measurements of the physical properties of near-Earth asteroids.
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