Visible-Wavelength Spectroscopy of Asteroids
Visible-Wavelength Spectroscopy of Asteroids
复制标题
小行星的可见波长光谱
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Barucci
中科院分区：
文献类型：
--
作者：
S. Bus;F. Vilas;M. Barucci
自20世纪80年代初首次用于天文研究以来，电荷耦合器件（CCD）摄谱仪对我们测量小行星光谱反射特性的能力产生了深远的影响。现在，对于比八色小行星巡天期间测得的要暗得多的小行星，通常可以获得高信噪比、低分辨率的光谱，覆盖0.4至1.0微米的可见光波段。通过在一次曝光中记录整个光谱范围，可以避免与多滤光片测光有关的一些困难，这些困难是由小行星的固有旋转或天空条件的时间变化引起的。利用电荷耦合器件光谱学进行的研究发现了小行星光谱中的若干吸收特征，为了解小行星表面的组成性质提供了新的见解。光谱测量还有助于我们更好地了解各类小行星的轨道分布。我们讨论了小行星光谱学的实际方面，侧重于观测程序，数据处理技术，和减少光谱的不确定性的潜在来源。我们还回顾了小行星光谱学的一些应用，并讨论了这些观测如何影响小行星分类的结构。
Since first becoming available for astronomical research in the early 1980s, charge-coupleddevice (CCD) spectrographs have had a profound impact on our ability to measure the spectralreflectance properties of asteroids. High signal-to-noise, low-resolution spectra, covering the visible-wavelength region from 0.4 to 1.0 μm, are now routinely obtained for asteroids much fainter than were measured during the Eight-Color Asteroid Survey. By recording the entire spectral range in a single exposure, some of the difficulties associated with multifilter photometry, arising from the inherent rotation of asteroids or from temporal variations in sky conditions, can be avoided. Studies involving CCD spectroscopy have resulted in the discovery of several absorption features in the spectra of asteroids and have provided new insights into the compositional nature of asteroid surfaces. Spectral surveys have also helped to refine our understanding of the orbital distributions of asteroid classes. We discuss the practical aspects of asteroid spectroscopy, focusing on observing procedures, data reduction techniques, and potential sources for uncertainty in the reduced spectra. We also review some of the applications of asteroid spectroscopy, and discuss how these observations have impacted the structure of asteroid taxonomy.