Hayabusa Returned 1,500 Itokawa Grains, Completing First Asteroid Sample Return After 7-Year Ordeal
Updated
Updated · spacedaily.com · Jun 1
Hayabusa Returned 1,500 Itokawa Grains, Completing First Asteroid Sample Return After 7-Year Ordeal
3 articles · Updated · spacedaily.com · Jun 1
A 40-centimetre capsule from Japan’s Hayabusa landed in South Australia on 13 June 2010, carrying the first samples ever returned from an asteroid after the spacecraft broke up on reentry.
Seven years of failures nearly killed the mission: fuel leaks, communications outages, ion-engine trouble and a lost MINERVA lander delayed the return by about three years, while the sampling projectiles failed to fire on two 2005 touchdowns.
Roughly 1,500 dust grains still reached the catcher because contact with Itokawa’s weak-gravity surface kicked regolith into the collection horn; JAXA later confirmed the particles were extraterrestrial and traceable to the 550-metre asteroid.
Science papers in 2011 showed the grains matched LL chondrites, directly linking a common meteorite class to an S-type asteroid and helping explain the spectral mismatch through space weathering.
That hard-won success shaped later missions: Hayabusa2 returned Ryugu samples in 2020 with a redesigned system, and NASA’s OSIRIS-REx added Bennu material in 2023 as direct asteroid sampling expands.
As China's asteroid mission returns samples next year, how will this accelerate the global race for space resources?
How did Hayabusa's 'successful failure' pave the way for the advanced technology used in today's asteroid-sampling missions?
Asteroids held life's building blocks. What unique secrets will samples from Mars' moon Phobos reveal about our origins?
1,500 Grains from Itokawa: The Hayabusa Mission’s Lasting Impact on Asteroid Science and Exploration
Overview
The Hayabusa spacecraft’s return in 2010 marked a turning point in asteroid science, as its re-entry capsule was delivered to JAXA’s curation facility and began a new era of detailed analysis. Scientists collected about 1,500 tiny particles from asteroid Itokawa, using specialized tools developed for precise handling. These samples were shared internationally, enabling global collaboration. Advanced analysis revealed key insights into Itokawa’s composition and history, confirming its link to meteorites found on Earth and its structure as a rubble-pile asteroid. The mission’s achievements set the stage for future exploration and deepened our understanding of the solar system.