BVRI photometry的53个不寻常的小行星
BVRI photometry of 53 unusual asteroids
摘要：
本文介绍了53颗不寻常小行星的BVRI测光和分类结果，其中包括35颗近地小行星、6颗高偏心率/倾角小行星和12颗最近发现的小行星对候选者。这些小行星中的大多数在这项工作之前没有被报道分类。对于以前研究过的少数小行星，结果大体上是一致的。此外，我们合并了来自几个光度/光谱调查的结果，以创建一个有史以来最大的样本，其中包含449个光谱分类的NEAs用于统计分析。我们在H~18<=>D~ 1 km处发现了类C/X和类S近地小行星相对数量的“转换点”，置信度为~95%或更高。我们发现18<=H<22的类C/X：类S比大约是H<18的两倍（0.33+/-0.04对0.17+/-0.02），这实际上支持了较小的近地小行星通常具有较少的风化表面（因此，较少的红色外观）的假设。
英文摘要：
We present the results of BVRI photometry and classification of 53 unusual asteroids, including 35 near-Earth asteroids (NEAs), 6 high eccentricity/inclination asteroids, and 12 recently-identified asteroid-pair candidates. Most of these asteroids were not reportedly classified prior to this work. For the few asteroids that have been previously studied, the results are generally in rough agreement. In addition, we merge the results from several photometric/spectroscopic surveys to create a largest-ever sample with 449 spectrally classified NEAs for statistical analysis. We identify a "transition point" of the relative number of C/X-like and S-like NEAs at H~18<=>D~1km with confidence level at ~95% or higher. We find that the C/X-like:S-like ratio for 18<=H<22 is about two times higher than that of H<18 (0.33+/-0.04 versus 0.17+/-0.02), virtually supporting the hypothesis that smaller NEAs generally have less weathered surface (therefore, less reddish appearance) caused by younger collision ages.
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