Japan · JAXAfirstrobotic
December 6, 2020
Hayabusa 2 returns asteroid Ryugu sample
Before dawn on 6 December 2020, a fireball streaked across the black sky over Woomera, South Australia. Inside that man-made meteor was a 16-inch capsule holding fragments of another world. Hayabusa2 had just completed a six-year, 5.24-billion-kilometer round trip to asteroid Ryugu, and recovery teams with helicopters, radio beacons and drones fanned out across the outback to find the prize. They had it within hours, sitting intact on the red desert floor.
Getting that capsule filled had tested JAXA to its limits. When Hayabusa2 arrived at Ryugu in June 2018, the asteroid turned out to be a treacherous rubble pile strewn with boulders, forcing months of replanning. The spacecraft threaded its first touchdown on 22 February 2019, then did something audacious: it fired a copper projectile into Ryugu to blast open an artificial crater, and on 11 July 2019 touched down again to grab freshly exposed subsurface material, the first ever collected from an asteroid.
Along the way it dropped a small fleet of hopping robots onto the surface, including the German-French MASCOT lander, turning a sample-return mission into a full expedition. When scientists opened the capsule in Japan, they found 5.4 grams of jet-black grains, fifty-four times the mission's official goal of a tenth of a gram, and the freshest carbonaceous asteroid material humanity had ever held.
The samples have kept delivering ever since, yielding water-bearing minerals, amino acids and even uracil, one of the building blocks of RNA. And the story is not over: the mothership skipped reentry entirely and is still flying an extended mission, with an asteroid flyby in 2026 and a rendezvous with the tiny, fast-spinning asteroid 1998 KY26 scheduled for 2031.
“Hayabusa2 is home. It has finished six years of voyage and we landed in the Woomera and we could collect the treasure box.”
Mission Data
Launch
3 Dec 2014, Tanegashima Space Center
Arrival at Ryugu
27 Jun 2018
Touchdowns
22 Feb 2019 and 11 Jul 2019
Capsule return
6 Dec 2020, Woomera, Australia
Sample returned
5.4 g (goal was 0.1 g)
Total journey
5.24 billion km over 6 years
Key Facts
The mission returned 54 times more material than its official 0.1-gram goal.
Hayabusa2 fired a copper projectile into Ryugu to excavate a crater, then collected the first subsurface asteroid sample in history from the debris.
It deployed multiple hopping rovers onto Ryugu's surface, including the German-French MASCOT lander, the first rovers ever to operate on an asteroid.
Analysis of the grains revealed amino acids, water-bearing minerals and uracil, a component of RNA, inside material older than the planets.
The spacecraft never came home: it released the capsule during an Earth flyby and is still flying, bound for a rendezvous with 30-meter asteroid 1998 KY26 in 2031.
Why It Mattered
Hayabusa2 transformed asteroid sample return from a heroic near-miss, as the original Hayabusa had been, into a reliable scientific pipeline. Its pristine carbonaceous grains gave laboratories their first untainted look at the water- and carbon-rich material that seeded the early Earth, and its sample exchange with NASA's OSIRIS-REx created the comparative asteroid science that now anchors origin-of-life research. The mission also proved precision operations around a hazardous rubble-pile body, knowledge that informs every small-body and planetary-defense mission since.
JAXA, University of Tokyo & collaborators / IAU, CC BY 4.0
Official source
