SMRTR Science & EngineeringSep 18, 2025Interesting Engineering

Cosmic fidget spinner: Hayabusa2 to land on smallest asteroid ever with 5-minute days

SMRTR summary

Japan's Hayabusa2 spacecraft faces new challenges as astronomers discover asteroid 1998 KY26 is just 11 meters across and completes one rotation every five minutes—much smaller and faster than previously thought. This tiny size, comparable to the spacecraft itself, complicates JAXA's planned 2031 touchdown mission, though it offers an unprecedented opportunity to study an asteroid class never observed up close.

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