论文标题
带有tomo-e gozen的微小物体的视频观察
Video Observations of Tiny Near-Earth Objects with Tomo-e Gozen
论文作者
论文摘要
我们报告了近地（NEOS）（NEOS）在KISO 105 cm Schmidt望远镜上使用Tomo-e Gozen的近地物（NEOS）的视频观察结果。小行星的旋转周期反映了其动力学历史和物理特性，因为较小的物体对YORP效应敏感。从2018年到2021年，我们对2 fps进行了60个小NEO的视频观察结果，并成功得出了32个NEO的旋转周期和轴向比率，其中包括13个旋转周期小于60 s的快速旋转器。在我们的调查中发现的最快旋转器是2020 HS7，旋转周期为2.99 s。从统计学上讲，我们在统计上证实，在任何以前的调查中，新人口中有一定数量的快速旋转器。我们发现，直径和旋转周期（D-P）图在10 s的周期截断时，微小的NEO的分布被截断。具有固定形状的截断是通过NEOS的逼真的拉伸强度或通过METEEROID撞击抑制了Yorp的截断。我们提出，切向YORP对旋转周期的依赖性可能解释了D-P图中观察到的模式。
We report the results of video observations of tiny (diameter less than 100 m) near-Earth objects (NEOs) with Tomo-e Gozen on the Kiso 105 cm Schmidt telescope. A rotational period of a tiny asteroid reflects its dynamical history and physical properties since smaller objects are sensitive to the YORP effect. We carried out video observations of 60 tiny NEOs at 2 fps from 2018 to 2021 and successfully derived the rotational periods and axial ratios of 32 NEOs including 13 fast rotators with rotational periods less than 60 s. The fastest rotator found during our survey is 2020 HS7 with a rotational period of 2.99 s. We statistically confirmed that there is a certain number of tiny fast rotators in the NEO population, which have been missed with any previous surveys. We have discovered that the distribution of the tiny NEOs in a diameter and rotational period (D-P) diagram is truncated around a period of 10 s. The truncation with a flat-top shape is not explained well either by a realistic tensile strength of NEOs or suppression of YORP by meteoroid impacts. We propose that the dependence of the tangential YORP effect on the rotational period potentially explains the observed pattern in the D-P diagram.
