Jupiter-family comets (JFCs) contribute a significant amount of debris to near-Earth space. However, telescopic observations of these objects seem to suggest that they have short physical lifetimes. If this is true, the material generated will also be short-lived, but fireball observation networks still detect material on cometary orbits. This study examines centimeter-to-meter-scale sporadic meteoroids detected by the Desert Fireball Network from 2014 to 2020 originating from JFC-like orbits. Analyzing each event’s dynamic history and physical characteristics, we confidently determined whether they originated from the main asteroid belt or the trans-Neptunian region. Our results indicate that <4% of sporadic meteoroids on JFC-like orbits are genetically cometary. This observation is statistically significant and shows that cometary material is too friable to survive in near-Earth space. Even when considering shower contributions, meteoroids on JFC-like orbits are primarily from the main belt. Thus, the presence of genuine cometary meteorites in terrestrial collections is highly unlikely.

木星家族彗星 (JFC) 向近地空间贡献了大量碎片。然而，对这些天体的望远镜观测似乎表明它们的物理寿命很短。如果这是真的，产生的物质也将是短暂的，但火球观测网络仍能探测到彗星轨道上的物质。这项研究检查了沙漠火球网络从 2014 年到 2020 年从类似 JFC 的轨道探测到的厘米到米级的零星流星体。分析每个事件的动态历史和物理特征，我们自信地确定它们是起源于主小行星带还是跨海王星区域。我们的结果表明，在类似 JFC 的轨道上，<4% 的零星流星体是遗传彗星。这一观察结果具有统计学意义，表明彗星物质太脆而无法在近地空间生存。即使考虑到流星雨的贡献，类似 JFC 轨道上的流星体也主要来自主带。因此，在陆地收藏中存在真正的彗星陨石的可能性很小。