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arXiv 2009.05129astro-ph.EP
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ATLAS双波段photometry的小行星相位曲线

Asteroid phase curves from ATLAS dual-band photometry

M. Mahlke, B. Carry, L. Denneau

摘要:

小行星相位曲线通过确定绝对星等H来导出基本物理性质。即将进行的可见光时空遗留巡天和中红外近地天体监视任务巡天依靠这些绝对星等来确定数百万颗小行星的颜色和亮度。此外,相位曲线的形状反映了它们的表面组成,从而可以对其分类得出结论。我们推导出小行星相位曲线从双波段测光获得的小行星地球撞击最后警报系统望远镜。使用贝叶斯参数推断,我们检索了光度计$H, G_1, G_2$ -和$H, G^*_{12}$ -系统中94,777颗小行星的127,012个相位曲线的绝对星等和斜率参数。小行星的分类复合体在观测到的$G_1, G_2$分布中分开,与它们的平均视觉距离相关。这允许使用斜率参数将X复合体区分为P复合体、M复合体和E复合体,作为对双曲型测量的替代。此外,分类错误的分光光度数据集,以及闯入者的动力家庭的小行星揭示自己在$G_1, G_2$ -空间。应用于偶然观测的$H, G^*_{12}$ -模型无法解析目标分类。的$G_1, G_2$相位系数显示波长依赖性的大多数分类复合物。偶然的小行星观测可以可靠地确定大量小行星的相位曲线。为了确保获得的绝对星等适合于彩色计算,未来的测量必须密集地覆盖相位曲线的反向效应,从而最大限度地减少H的不确定性。相位曲线斜率参数为分类学分类提供了一个可访问的维度。

英文摘要:

Asteroid phase curves are used to derive fundamental physical properties through the determination of the absolute magnitude H. The upcoming visible Legacy Survey of Space and Time (LSST) and mid-infrared Near-Earth Object Surveillance Mission (NEOSM) surveys rely on these absolute magnitudes to derive the colours and albedos of millions of asteroids. Furthermore, the shape of the phase curves reflects their surface compositions, allowing for conclusions on their taxonomy. We derive asteroid phase curves from dual-band photometry acquired by the Asteroid Terrestrial-impact Last Alert System telescopes. Using Bayesian parameter inference, we retrieve the absolute magnitudes and slope parameters of 127,012 phase curves of 94,777 asteroids in the photometric $H, G_1, G_2$- and $H, G^*_{12}$-systems. The taxonomic complexes of asteroids separate in the observed $G_1, G_2$-distributions, correlating with their mean visual albedo. This allows for differentiating the X-complex into the P-, M-, and E-complexes using the slope parameters as alternative to albedo measurements. Further, taxonomic misclassifications from spectrophotometric datasets as well as interlopers in dynamical families of asteroids reveal themselves in $G_1, G_2$-space. The $H, G^*_{12}$-model applied to the serendipitous observations is unable to resolve target taxonomy. The $G_1, G_2$ phase coefficients show wavelength-dependency for the majority of taxonomic complexes. Serendipitous asteroid observations allow for reliable phase curve determination for a large number of asteroids. To ensure that the acquired absolute magnitudes are suited for colour computations, it is imperative that future surveys densely cover the opposition effects of the phase curves, minimizing the uncertainty on H. The phase curve slope parameters offer an accessible dimension for taxonomic classification.

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