In Planetary and Space Science for April (vol. 273-74):
Lin, C-M. Yang, I-C. Classification of 14 major meteoroid streams based on long-term population indices of their meteor showers 106266 .2026.106266
Wu, M. Liu, C. Shao, W. et al. Preparation and characterization of an S-type asteroid regolith simulant based on the mineral composition of Itokawa particles 106267 .2026.106267
There are meteors in meteor showers… and there are random meteors that appear for no reason- the background rate. How do we know literal meteor showers are actually related (by some parent comet, or active asteroid), not just fluctuations in the background level? Lin et al. find some showers are more ‘showery’.
Itokawa is not an active asteroid… yet. Some day, we want to deflect or mine an S-type asteroid. As the best-known S-type body (thanks to the Hayabusa probe), Itokawa’s the flag-bearer for its entire type. Wu et al. do us all the favor of defining a specification for Itokawa-like simulant, for use in ground tests.