Albedos of Centaurs, Jovian Trojans, and Hildas
Albedos of Centaurs, Jovian Trojans, and Hildas
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DOI：
10.3847/1538-3881/aac210
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
W. Romanishin;S. Tegler
中科院分区：
文献类型：
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作者：
W. Romanishin;S. Tegler
我们提出了光学V波段的中太阳系次要机构，包括半人马座，木星特洛伊，和希尔达斯分布。直径主要来自NEOWISE目录。在所研究的2700个天体中，约有三分之二的光学测光（H值）来自Pan-STARRS，并由JPL Horizons的H值补充（根据Pan-STARRS测光系统进行了校正）。半人马座的光学数据来自我们以前发表的工作。由于使用了Pan-STARRS光学数据，这里提出的观测结果应该比以前的工作优越上级，Pan-STARRS光学数据是一个已转换为标准V星等的均匀数据集。我们使用非参数Wilcoxon检验来比较样本对的Rendo分布。我们加强了我们以前的发现，灰色半人马座有较低的拱度比红色半人马座。灰色半人马与特洛伊人没有明显的不同，这表明特洛伊人和灰色半人马有着共同的起源。特洛伊L4和L5云的中值分布在非常高的统计显著性水平上相差0.10%，但它们的分布模式仅相差0.1%。我们建议存在一个共同的“真正的背景”，在两个云，与一个额外的更多的反射组件在L4云。我们发现，与Grav等人一致，Hildas比Trojans暗15%-25%。也许希尔达斯是黑暗的，因为他们通过近近日点附近的主小行星带的第三区，这可能会导致显着的黑暗园艺。
We present optical V band albedo distributions for middle solar system minor bodies including Centaurs, Jovian Trojans, and Hildas. Diameters come mostly from the NEOWISE catalog. Optical photometry (H values) for about two-thirds of the ∼2700 objects studied are from Pan-STARRS, supplemented by H values from JPL Horizons (corrected to the Pan-STARRS photometric system). Optical data for Centaurs are from our previously published work. The albedos presented here should be superior to previous work because of the use of the Pan-STARRS optical data, which is a homogeneous data set that has been transformed to standard V magnitudes. We compare the albedo distributions of pairs of samples using the nonparametric Wilcoxon test. We strengthen our previous findings that gray Centaurs have lower albedos than red Centaurs. The gray Centaurs have albedos that are not significantly different from those of the Trojans, suggesting a common origin for Trojans and gray Centaurs. The Trojan L4 and L5 clouds have median albedos that differ by ∼10% at a very high level of statistical significance, but the modes of their albedo distributions differ by only ∼1%. We suggest the presence of a common “true background” in the two clouds, with an additional more reflective component in the L4 cloud. We find, in agreement with Grav et al. that the Hildas are darker than the Trojans by 15%–25%. Perhaps the Hildas are darker because of their passage near perihelion through zone III of the main asteroid belt, which might result in significant darkening by gardening.