论文标题
使用大气冲击数据来建模Meteoroid关闭相遇
Using Atmospheric Impact Data to Model Meteoroid Close Encounters
论文作者
论文摘要
基于木星家庭彗星(JFC)的望远镜观察,预计在子公里尺寸的对象很少。但是,几个明亮的火球和一些陨石与JFC人口微不足道,显示该地区确实存在米大小的物体。在2017年,沙漠火球网络(DFN)观察到了一个放牧的火球,将流星从阿波罗型轨道重定向到类似摩托车的轨道。使用DFN收集的轨道数据,在这项研究中,我们生成了一个人工近地面相遇的人工数据集,地球的$ 0.01-1-100 $ kg以$ 0.01-100 $ kg。对于望远镜调查而言,这种物体通常太小,无法检测到,因此使用大气冲击磁通量数据目前是表征这些近距离相遇的唯一方法之一。基于此模型,我们预测,在考虑到$ 2.5 \ $ 2.5 \ times 10^{8} $对象($ 0.1 \%\%\%的总磁通量)中,每年将每年发送到JFC的Orbits($ t_ {J}> 3 $)上,将其发送到JFC样orbits($ 2 <t_ t_ t_ {j} <3 $),并与$ 8 $ 8^$ 8^$ 8”与地球的紧密相遇提供了将材料转移到JFC区域的另一种方法。此外,使用我们的模型,我们发现将大约$ 1.96 \ times 10^{7} $对象发送到Aten-Type轨道上,并且每年通过与地球的亲密接触每年从太阳系中弹出$ \ sim10^{4} $对象。
Based on telescopic observations of Jupiter-family comets (JFCs), there is predicted to be a paucity of objects at sub-kilometre sizes. However, several bright fireballs and some meteorites have been tenuously linked to the JFC population, showing metre-scale objects do exist in this region. In 2017, the Desert Fireball Network (DFN) observed a grazing fireball that redirected a meteoroid from an Apollo-type orbit to a JFC-like orbit. Using orbital data collected by the DFN, in this study, we have generated an artificial dataset of close terrestrial encounters that come within $1.5$ lunar distances (LD) of the Earth in the size-range of $0.01-100$kg. This range of objects is typically too small for telescopic surveys to detect, so using atmospheric impact flux data from fireball observations is currently one of the only ways to characterise these close encounters. Based on this model, we predict that within the considered size-range $2.5\times 10^{8}$ objects ($0.1\%$ of the total flux) from asteroidal orbits ($T_{J}>3$) are annually sent onto JFC-like orbits ($2<T_{J}<3$), with a steady-state population of about $8\times 10^{13}$ objects. Close encounters with the Earth provide another way to transfer material to the JFC region. Additionally, using our model, we found that approximately $1.96\times 10^{7}$ objects are sent onto Aten-type orbits and $\sim10^{4}$ objects are ejected from the Solar System annually via a close encounter with the Earth.