发表机构
Charles University, Faculty of Mathematics and Physics, Institute of Astronomy（查理大学数学物理学院天文研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用巡天光度数据和凸光变曲线反演，重建约3万个小行星的自转与形状模型，揭示自转周期分布与分类、自转屏障附近形状及非主轴旋转等规律。
AI 中文摘要
现代小行星巡天通常为数十万颗小行星获取稀疏光度测量数据。这些数据可用于重建小行星的自转状态和形状，为不同动力学群体的自转演化提供统计约束。我们的目标是利用公开可用的巡天光度测量数据推导自转状态和形状模型，并利用扩大的样本研究太阳系内小行星物理性质的分布。我们结合了来自Catalina、Mt. Lemmon、Pan-STARRS、ZTF、USNO、ATLAS、ASAS-SN、TESS和Gaia的稀疏光度数据，并应用凸光变曲线反演方法来确定恒星自转周期、自转轴方向、凸形状、相位函数参数和颜色。广泛的参数空间搜索通过分布式计算项目Asteroids@home完成。我们推导了约30000个小行星模型，包括约22000个独特的自转状态解和近10000个部分极点解，使可用的小行星模型数量增加了两倍。扩大的样本证实了自转周期分布对分类学类别的依赖性，揭示了在自转屏障附近明显缺乏细长小行星，并表明慢自转者表现出系统性地更大的光度残差，支持了许多处于非主轴自转状态的解释。我们推导了47颗近地小行星、247颗木星特洛伊和157颗希尔达群小行星的自转状态分布。扩大的特洛伊样本不再显示出统计上显著的顺行自转者过剩。现代巡天光度测量与大规模光变曲线反演的结合使得基于数万个小行星模型的群体研究成为可能。由此产生的数据库为小行星的自转演化提供了改进的约束。
英文摘要
Modern asteroid surveys routinely acquire sparse photometric measurements for hundreds of thousands of asteroids. These data can be exploited to reconstruct asteroid spin states and shapes, providing statistical constraints on the rotational evolution of different dynamical populations.Our goal is to derive spin-state and shape models from publicly available survey photometry and use the enlarged sample to investigate the distributions of asteroid physical properties across the Solar System. We combined sparse photometry from Catalina, Mt. Lemmon, Pan-STARRS, ZTF, USNO, ATLAS, ASAS-SN, TESS, and Gaia and applied convex light-curve inversion to determine sidereal rotation periods, spin-axis orientations, convex shapes, phase-function parameters, and colors. The extensive parameter-space search was performed using the distributed-computing project Asteroids@home.We derived approximately 30000 asteroid models, including about 22000 unique spin-state solutions and almost 10000 partial pole solutions, tripling the number of available asteroid models. The enlarged sample confirms the dependence of the rotation-period distribution on taxonomic class, reveals a pronounced lack of elongated asteroids near the spin barrier, and shows that slow rotators exhibit systematically larger photometric residuals, supporting the interpretation that many are in non-principal-axis rotation. We derived spin-state distributions for 47 near-Earth asteroids, 247 Jupiter Trojans, and 157 Hildas. The expanded Trojan sample no longer shows a statistically significant excess of prograde rotators. The combination of modern survey photometry and large-scale light-curve inversion enables population studies based on tens of thousands of asteroid models. The resulting database provides improved constraints on the rotational evolution of asteroids
DOI：10.1051/0004-6361/202662316
