论文标题
通过鲁宾天文台遗产调查的空间和时间调查来预测小行星大小估计的准确性
Predicting the Accuracy of Asteroid Size Estimation with Data from the Rubin Observatory Legacy Survey of Space and Time
论文作者
论文摘要
最近的工作表明，SDSS颜色与光学反照率之间的相关性可用于仅从光学数据中估算小行星大小。我们对小行星的SDSS颜色与光学反照率之间的相关性进行了重新相关，使用基于明智的大小估计值得出的反照率。 Moeyens，MyHrvold \＆Ivezić（2020）表明，仅使用光学数据来估计小行星大小，相对于基于明智的尺寸估计值，精度约为17 \％。我们在这里提出了几种更复杂的数据驱动模型，用于具有颜色的光学反照率变化，并估算了SDSS光度误差对反照率和大小估计不确定性的贡献。我们使用分析结果来预测LSST数据将使小行星大小的精度相对于基于明智的大小估计值约为15 \％。相比之下，基于明智的尺寸估计值为15-20 \％，光学尺寸估计值的隐含准确性在21-25 \％范围内仅为1.3至1.4的倍数。这种尺寸估计的精度明显优于光学数据通常假定的，并且是由于现代数字天空调查提供的准确和均匀的多波段光度法。
Recent work has shown that the correlation between SDSS colors and optical albedo can be used to estimate asteroid sizes from optical data alone. We revisit a correlation between SDSS colors and optical albedo for asteroids, with the albedo derived using WISE-based size estimates. Moeyens, Myhrvold \& Ivezić (2020) showed that this correlation can be used to estimate asteroid sizes with optical data alone, with a precision of about 17\% relative to WISE-based size estimates. We present here several more sophisticated data-driven models for the variation of optical albedo with colors and estimate the contribution of SDSS photometric errors to the albedo and size estimate uncertainties. We use the results of our analysis to predict that LSST data will enable asteroid size precision of about 15\% relative to WISE-based size estimates. Compared to the accuracy of WISE-based size estimates of 15-20\%, the implied accuracy of optical size estimates, in the range 21-25\%, is thus only a factor of 1.3 to 1.4 worse. This size estimation accuracy is significantly better than commonly assumed for optical data and is due to accurate and homogeneous multi-band photometry delivered by modern digital sky surveys.
