论文标题
近似小行星的表面特性
Surface Properties of Near-Sun Asteroids
论文作者
论文摘要
近地球距离距离近距离距离的接近地球（NEAS）达到> 1000 K的亚磨牙温度。假设它们会受到“超级胃的”破坏，可能是由近乎sun的过程引起的，例如热破裂，旋转，旋转，旋转，子Meteoloid撞击和地下挥发性释放；所有这些都可能导致表面改变，这可能会改变表面的光谱斜率。我们试图观察到2017年1月至2020年3月Q <0.15 au的53个已知的近阳性小行星中的35个，以搜索与近Sun过程有关的趋势。我们报告了我们成功观察到的22个对象的光颜色和光谱斜率以及三个对象的测量旋转周期。我们发现颜色的分布总体上比NEAS的颜色分布更蓝，尽管重叠很大。我们将大散射归因于未知的动态历史和单个对象的组成以及竞争的表面改变过程。我们还研究了颜色与其他特性之间的潜在相关性（例如，围栏距离，透明参数，旋转期），并寻找活动的证据。最后，我们已经编译了这些对象的所有已知物理和动力学特性，包括概率源区域和Q <0.15 au的停留时间。
Near-Earth Asteroids (NEAs) with small perihelion distances reach sub-solar temperatures of > 1000 K. They are hypothesized to undergo "super-catastrophic" disruption, potentially caused by near-Sun processes such as thermal cracking, spin-up, meteoroid impacts, and subsurface volatile release; all of which are likely to cause surface alteration, which may change the spectral slope of the surface. We attempted to observe 35 of the 53 known near-Sun asteroids with q < 0.15 au from January 2017 to March 2020 to search for trends related to near-Sun processes. We report the optical colors and spectral slopes of 22 objects that we successfully observed and the measured rotation periods for three objects. We find the distribution of colors to be overall bluer than the color distribution of NEAs, though there is large overlap. We attribute large scatter to unknown dynamical histories and compositions for individual objects, as well as competing surface altering processes. We also investigated potential correlations between colors and other properties (e.g., perihelion distance, Tisserand parameter, rotation period), and searched for evidence of activity. Finally, we have compiled all known physical and dynamical properties of these objects, including probabilistic source regions and dwell times with q < 0.15 au.
