Asteroid lightcurve phase shift from rough‐surface shadowing
Asteroid lightcurve phase shift from rough‐surface shadowing
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DOI：
10.1111/maps.12061
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发表时间：
2014-01
影响因子：
2.2
通讯作者：
O. Wilkman;K. Muinonen
中科院分区：
文献类型：
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作者：
O. Wilkman;K. Muinonen
我们已经模拟了小行星的简单形状模型，使用现实的表面散射法的光变曲线。散射定律包括用数值射线追踪计算的遮蔽函数。我们计算了光变曲线在各种照明几何的传统Lommel-Seeliger法和我们的数值法。我们观察到的光变曲线，这取决于散射法的参数，以及照明的几何形状和旋转轴的小行星的方向的旋转相位的转变。这种相位偏移在对立面总是为零，对于主带小行星典型的照明几何形状，可以大到10°。相移会影响基于小行星光曲线分析的其他结果的准确性，例如自旋状态或形状确定。
We have simulated asteroid lightcurves for simple shape models using a realistic surface scattering law. The scattering law includes a shadowing function computed with numerical ray‐tracing. We computed lightcurves in a variety of illumination geometries for both the traditional Lommel–Seeliger law and our seminumerical law. We observe a shift in the rotational phase of the lightcurves, which depends on the parameters of the scattering law as well as the illumination geometry and the direction of the spin axis of the asteroid. This phase shift is always zero at opposition, and can be as large as 10° for illumination geometries typical for Main Belt asteroids. The phase shift has implications on the accuracy of other results which are based on asteroid lightcurve analysis, such as spin‐state or shape determination.