利用UKIRT进行近地天体快速响应分光光度学特性鉴定的初步结果
First Results from the Rapid-Response Spectrophotometric Characterization of Near-Earth Objects using UKIRT
摘要：
我们利用联合王国红外望远镜的宽视场照相机测量近地天体的近红外颜色，以便对其分类加以限制。我们的观测具有快速反应的特点，这使我们能够在近地天体靠近地球并且明亮时对其进行观测。在此，我们介绍了86个近地天体的近红外颜色测量结果，其中大多数是在发现后几天内观测到的，使我们能够确定直径仅为几米的近地天体的特征。使用机器学习方法，我们将我们的测量结果与现有的小行星光谱数据进行比较，并为我们的目标提供概率分类。我们的观测使我们能够区分S-复合体，C/X-复合体，D-型和V-型小行星。我们的研究结果表明，S-复合小行星在整个近地天体群中所占的比例低于陨石坠落统计数据中普通小行星所占的比例。UKIRT获得的未来数据将用于研究这种差异的意义。
英文摘要：
Using the Wide Field Camera for the United Kingdom Infrared Telescope, we measure the near-infrared colors of near-Earth objects (NEOs) in order to put constraints on their taxonomic classifications. The rapid-response character of our observations allows us to observe NEOs when they are close to the Earth and bright. Here we present near-infrared color measurements of 86 NEOs, most of which were observed within a few days of their discovery, allowing us to characterize NEOs with diameters of only a few meters. Using machine-learning methods, we compare our measurements to existing asteroid spectral data and provide probabilistic taxonomic classifications for our targets. Our observations allow us to distinguish between S-complex, C/X-complex, D-type, and V-type asteroids. Our results suggest that the fraction of S-complex asteroids in the whole NEO population is lower than the fraction of ordinary chondrites in the meteorite fall statistics. Future data obtained with UKIRT will be used to investigate the significance of this discrepancy.
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