Red (S > 10%/0.1 μm) spectral slopes are common among Centaurs and trans-Neptunian objects (TNOs) in the outer solar system. Interior to and co-orbital with Jupiter, the red (S ∼ 10%/0.1 μm) slopes of D-type main-belt and Jupiter Trojan asteroids are thought to reflect their hypothesized shared origin with TNOs beyond the orbit of Jupiter. In order to quantify the abundance of red-sloped asteroids within the main belt, we conducted a survey using the NASA Infrared Telescope Facility and the Lowell Discovery Telescope. We followed up on 32 candidate red objects identified via spectrophotometry from the Sloan Digital Sky Survey’s Moving Object Catalog to confirm their steep spectral slopes and determine their taxonomic classifications. We find that our criteria for identifying candidate red objects from the Moving Object Catalog result in a ∼50% confirmation rate for steeply red-sloped asteroids. We also compare our observations of main-belt asteroids to existing literature spectra of the Jupiter Trojans and steeply red-sloped main-belt asteroids. We show that some red-sloped asteroids have linearly increasing reflectance with increasing wavelength, while other red-sloped asteroids show a flattening in slope at longer near-infrared wavelengths, indicating a diversity among the population of spectrally red main-belt asteroids suggestive of a variety of origins among the population of steep-sloped asteroids.

中文翻译：

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中外主带高红斜度小行星的分布

红色的 （S> 10%/0.1μm) 光谱斜率在太阳系外的半人马座和跨海王星天体 (TNO) 中很常见。位于木星内部并与木星共轨，红色（S～ 10%/0.1μm) D型主带和木星特洛伊小行星的斜率被认为反映了它们与木星轨道以外的TNO的假设的共同起源。为了量化主带内红倾斜小行星的丰度，我们使用美国宇航局红外望远镜设施和洛厄尔发现望远镜进行了一项调查。我们对斯隆数字巡天移动物体目录中通过分光光度法识别出的 32 个候选红色物体进行了跟踪，以确认它们陡峭的光谱斜率并确定它们的分类。我们发现，根据我们从移动天体目录中识别候选红色天体的标准，陡红色倾斜小行星的确认率约为 50%。我们还将我们对主带小行星的观测结果与木星特洛伊和陡红斜主带小行星的现有文献光谱进行了比较。我们表明，一些红倾斜小行星的反射率随着波长的增加而线性增加，而其他红倾斜小行星在较长的近红外波长处显示出斜率变平，这表明光谱红色主带小行星群体之间存在多样性，暗示着陡坡小行星群的起源多种多样。