Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3
Shape, thermal and surface properties determination of a candidate spacecraft target asteroid (175706) 1996 FG3
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候选航天器目标小行星的形状、热和表面特性测定（175706）1996 FG3
DOI：
10.1093/mnras/stu164
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发表时间：
2014-01
影响因子：
4.8
通讯作者：
Wang Su
中科院分区：
文献类型：
--
作者：
Yu Liangliang;Ji Jianghui;Wang Su
本文根据已知的光变曲线推导了(175706) 1996 FG3的3D凸形模型，该模型由2040个三角形面和1022个顶点组成。考虑到观测的不确定性，确定小行星自转轴的最佳拟合方位为 lambda = 237 度7，beta = -83 度8，其自转周期约为3.5935 h。利用导出的形状模型，我们采用所谓的高级热物理模型（ATPM）来拟合已发表的三组1996 FG3的中红外观测数据，从而评估其表面特性。假设初级和次级具有相同的形状、反照率、热惯性和表面粗糙度，则从观察中获得最佳拟合参数。小行星的几何反照率和有效直径计算为 p(v) = 0.045 +/- 0.002，D-eff = 1.69(-0.02)(+0.05) km。初级和次级的直径分别确定为D-1 = 1.63(-0.03)(+0.04) km。表面热惯量 Gamma 导出为 80 +/- 40 Jm(-2) s(-0.5) K-1 的低值，粗糙度 f(R) 为 0.8(-0.4)(+0.2)。这表明原生岩体的表面可能有风化层，该风化层可能被灰尘、碎石碎片和沙子的混合物覆盖。根据地下温度分布的模拟，最小风化层深度估计为 5-20 毫米，这表明 1996 FG3 可能是样本返回任务的非常合适的目标。
In this paper, a 3D convex shape model of (175706) 1996 FG3, which consists of 2040 triangle facets and 1022 vertices, is derived from the known light curves. The best-fitting orientation of the asteroid's spin axis is determined to be lambda = 237 degrees.7 and beta = -83 degrees.8 considering the observation uncertainties, and its rotation period is similar to 3.5935 h. Using the derived shape model, we adopt the so-called advanced thermophysical model (ATPM) to fit three published sets of mid-infrared observations of 1996 FG3, so as to evaluate its surface properties. Assuming the primary and the secondary bear identical shape, albedo, thermal inertia and surface roughness, the best-fitting parameters are obtained from the observations. The geometric albedo and effective diameter of the asteroid are reckoned to be p(v) = 0.045 +/- 0.002, D-eff = 1.69(-0.02)(+0.05) km. The diameters of the primary and secondary are determined to be D-1 = 1.63(-0.03)(+0.04) km, respectively. The surface thermal inertia Gamma is derived to be a low value of 80 +/- 40 Jm(-2) s(-0.5) K-1 with a roughness fraction f(R) of 0.8(-0.4)(+0.2). This indicates that the primary possibly has a regolith layer on its surface, which is likely to be covered by a mixture of dust, fragmentary rocky debris and sand. The minimum regolith depth is estimated to be 5-20 mm from the simulations of subsurface temperature distribution, indicating that 1996 FG3 could be a very suitable target for a sample return mission.
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影响因子：
6.5
作者：
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通讯作者：
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DOI：
--
发表时间：
1989
期刊：
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影响因子：
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影响因子：
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A. Harris;J. W. Young;E. Bowell;L. J. Martin;R. Millis;M. Poutanen;F. Scaltriti;V. Zappalá;H. Schober;H. Debehogne;K. Zeigler
影响因子：
6.5
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通讯作者：
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