近地小行星的测光表征：自转、分类及内聚力候选证据
Photometric characterization of near-Earth asteroids: rotation, taxonomy, and candidate evidence for internal cohesion
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中文总结 AI 辅助
本研究通过测光与光变曲线观测，对15颗近地小行星完成分类，发现部分天体自转超无内聚力自旋屏障，提出内聚力碎石堆模型可解释该现象。
中文摘要 AI 辅助
我们展示了2024年下半年至2026年初期间，利用宽带BVR_cI_c测光和时间分辨光变曲线观测对先前未表征的近地小行星（NEAs）开展的巡天结果。在观测的15颗NEAs中，14颗获得了色指数，其尺寸范围为0.11至2.5 km，通过与参考反射率曲线样本比对推导分类。该样本以S型、X型、C型复合体及V型小行星为主；利用分类适配的反照率估算绝对星等和有效直径。对多个目标确定或约束了自转周期。部分大型天体自转快于经典无内聚力自旋屏障（周期P≈2.2 h），不过部分情况下因时间覆盖有限，周期测定仍具不确定性。内聚力碎石堆模型可合理解释观测到的快速自转（在推导物理参数的不确定范围内），量级为10²--10⁴ Pa的适度内聚力强度足以解释观测到的自转速率。
英文摘要
We present the results of a survey of previously uncharacterized near-Earth asteroids (NEAs) conducted between the second half of 2024 and the first months of 2026 using broadband $BVR_{c} I_{c}$ photometry and time-resolved lightcurve observations. Color indices were obtained for 14 NEAs of the 15 observed, with a dimension range between 0.11 and 2.5 km, and used to derive taxonomic classifications through comparison of a sample of reference reflectance curves. The sample appears to be dominated by S-, X-, and C-complex and V-type asteroids; absolute magnitudes and effective diameters were estimated using taxonomically appropriate albedos. Rotation periods were determined or constrained for several targets. Some large objects appear to rotate faster than the classical cohesionless spin barrier at $P\simeq 2.2$~h, although in some cases the period determinations remain tentative due to limited temporal coverage. A cohesive rubble-pile model provides a plausible explanation for the observed rapid rotation within the uncertainties of the derived physical parameters, and modest cohesive strengths of order $10^{2}$--$10^{4}$~Pa are sufficient to account for the observed rotation rates.
发表机构
- INAF - Osservatorio di Astrofisica e Scienza dello Spazio（意大利国家天体物理研究所）
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