论文标题
SPEX的二十年：小行星光谱中光谱斜率测量的准确性极限
Twenty years of SpeX: Accuracy limits of spectral slope measurements in asteroid spectroscopy
论文作者
论文摘要
我们检查了二十年的SPEX/NASA红外望远镜设施的观察结果，该工厂从小型小行星小行星光谱调查（SMASS）和MIT-HAWAII近地的物体光谱调查（MithNeos）进行了研究，以调查反射频谱测量的不确定性和系统误差，以调查反射频谱测量的Asperoids的不确定性。从用于校准小行星光谱的11个太阳能类似物的628个光谱中，我们在0.8至2.4微米的斜坡测量结果上得出了4.2％/微米的不确定性。空气质量在小行星和太阳能类似物之间每0.1单位空气质量差异-0.92％/微米，因此，SMASS和MITHNEOS的总体2.8％/微米斜率可变性为1.0至1.3空气质量。没有发现其他观察条件（包括视差角，视觉和湿度）有助于系统地变化。我们讨论对小行星分类学分类工作的影响。本研究中提供的不确定性应在对小体的将来的组成研究中解释，以区分内在异质性与可能的仪器效应。
We examined two decades of SpeX/NASA Infrared Telescope Facility observations from the Small Main-Belt Asteroid Spectroscopic Survey (SMASS) and the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS) to investigate uncertainties and systematic errors in reflectance spectral slope measurements of asteroids. From 628 spectra of 11 solar analogs used for calibration of the asteroid spectra, we derived an uncertainty of 4.2%/micron on slope measurements over 0.8 to 2.4 micron. Air mass contributes to -0.92%/micron per 0.1 unit air mass difference between the asteroid and the solar analog, and therefore for an overall 2.8%/micron slope variability in SMASS and MITHNEOS designed to operate within 1.0 to 1.3 air mass. No additional observing conditions (including parallactic angle, seeing and humidity) were found to contribute systematically to slope change. We discuss implications for asteroid taxonomic classification works. Uncertainties provided in this study should be accounted for in future compositional investigation of small bodies to distinguish intrinsic heterogeneities from possible instrumental effects.
