主带内、中部火成小行星0.4-1.0 μm光谱的AVAST巡天
AVAST Survey 0.4-1.0 μm Spectroscopy of Igneous Asteroids in the Inner and Middle Main Belt
摘要：
我们提出了60个小行星的光谱，其中包括47个V型在阿德勒V型小行星（AVAST）调查的第一阶段观察。采用SDSS光度测定法，根据$i-z$颜色非常蓝的性质，选择候选的V型小行星进行跟踪。在61颗观测到的候选小行星中，有47颗被明确归类为V型小行星，另外6颗显示出0.9 $μ$ m的特征，与V型光谱一致，但不足以进行正式分类。发现有四颗小行星是S型的，它们的$i-z$值都非常接近AVAST采用的$i-z \le -0.2$选择标准，其中一颗候选小行星远远超出切割范围（平均$i-z$为-0.11）。还发现了三颗A型小行星。在与木星的3：1平均运动共振之外观测到六颗V型小行星，包括在这一距离发现两颗新的V型小行星（63085和105041）。观测到6颗V型小行星的轨道倾角较低（$<5°$），超出了经典灶神星的正常动力学范围，表明至少有一些小行星的起源不是灶神星。
英文摘要：
We present the spectra of 60 asteroids, including 47 V-types observed during the first phase of the Adler V-Type Asteroid (AVAST) Survey. SDSS photometry was used to select candidate V-type asteroids for follow up by nature of their very blue $i-z$ color. 47 of the 61 observed candidates were positively classified as V-type asteroids, while an additional six show indications of a 0.9 $μ$m feature consistent with V-type spectra, but not sufficient for formal classification. Four asteroids were found to be S-type, all of which had $i-z$ values very near the adopted AVAST selection criteria of $i-z \le -0.2$, including one candidate observed well outside the cut (at a mean $i-z$ of -0.11). Three A-type asteroids were also identified. Six V-type asteroids were observed beyond the 3:1 mean motion resonance with Jupiter, including the identification of two new V-type asteroids (63085 and 105041) at this distance. Six V-type asteroids were observed with low ($<5°$) orbital inclination, outside of the normal dynamical range of classic Vestoids, and are suggestive of a non-Vesta origin for at least some of the population.
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