A relatively young Perseid dust filament was pulled from Comet Swift–Tuttle in 1865.
Comets shed dust and other material as they travel around the Sun. Over repeated orbits, that material spreads along the comet’s path and forms a meteoroid stream. Earth encounters part of this stream each year, producing the Perseid meteor shower.
The Perseids article identifies an especially young filament released in 1865. Because this material is comparatively concentrated, it can contribute to an early mini-peak roughly a day before the shower’s main maximum.
This filament is separate from the older bulk of the Perseid cloud. Most particles in the cloud have been present for around a thousand years, while the 1865 material provides a more recent layer within the stream. Such substructures help explain why meteor activity can vary during a shower rather than rising and falling perfectly smoothly.