两个新的玄武岩小行星在外主带？
Two new basaltic asteroids in the Outer Main Belt?
摘要：
在小行星主带的玄武岩小行星的识别和其表面矿物学的描述是必要的，以了解在玄武岩陨石收集的多样性。玄武质小行星可以从其可见光反射光谱中识别，在通常的分类中被归类为V型。在这项工作中，我们报告了两个候选V型小行星，（7472）Kumakiri和（10537）1991 RY 16，位于外主带（a > 2.85 UA）的可见光谱观测。Roig和Gil-Hutton（2006，Icarus 183，411）使用斯隆数字巡天的颜色识别了这些候选者。光谱观测是在2006年11月和12月的观测运行期间在西班牙Calar Alto天文台获得的。这两颗小行星的光谱显示出短边0.70微米的陡峭斜率和长边0.75微米的深吸收特征，这是V型小行星的特征。然而，在0.65微米附近存在一个浅但明显的吸收带，这对这两颗小行星的实际矿物学提出了一些问题。这样的频带从来没有观察到之前在玄武岩小行星的强度，我们检测到它。我们讨论的可能性，这种浅吸收功能所造成的铬在小行星表面上的存在。我们的研究结果表明，与（1459）Magnya一起，小行星（7472）Kumakiri和（10537）1991 RY 16可能是迄今为止在主带外部发现的唯一玄武岩物质痕迹。
英文摘要：
The identification of basaltic asteroids in the asteroid Main Belt and the description of their surface mineralogy is necessary to understand the diversity in the collection of basaltic meteorites. Basaltic asteroids can be identified from their visible reflectance spectra and are classified as V-type in the usual taxonomies. In this work, we report visible spectroscopic observations of two candidate V-type asteroids, (7472) Kumakiri and (10537) 1991 RY16, located in the outer Main Belt (a > 2.85 UA). These candidate have been previously identified by Roig and Gil-Hutton (2006, Icarus 183, 411) using the Sloan Digital Sky Survey colors. The spectroscopic observations have been obtained at the Calar Alto Observatory, Spain, during observational runs in November and December 2006. The spectra of these two asteroids show the steep slope shortwards of 0.70 microns and the deep absorption feature longwards of 0.75 microns that are characteristic of V-type asteroids. However, the presence of a shallow but conspicuous absorption band around 0.65 microns opens some questions about the actual mineralogy of these two asteroids. Such band has never been observed before in basaltic asteroids with the intensity we detected it. We discuss the possibility for this shallow absorption feature to be caused by the presence of chromium on the asteroid surface. Our results indicate that, together with (1459) Magnya, asteroids (7472) Kumakiri and (10537) 1991 RY16 may be the only traces of basaltic material found up to now in the outer Main Belt.
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