Endless shooting star marks successful Hayabusa-2 sample return

IN PICTURES – The Japanese probe, which passed close to Earth on Saturday, successfully delivered a small cosmic package containing asteroid dust in the Australian desert of Woomera.

In southern Australia, an endless shooting star crossed the sky right through the night from Saturday to Sunday (around 6.30 p.m. French time).

This unusual spectacle is that of the re-entry into the atmosphere of a small capsule dropped a few hours earlier by the Japanese probe Hayabusa-2 passing close to Earth. Inside the small package, a precious treasure: a pinch of dust collected on the asteroid Ryugu last year.

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The racing car going at 40,000 km / ha gave rise to a persistent “fireball”. Full video images are available on the Japanese Space Agency (Jaxa) website:

On board the International Space Station, the Japanese Soichi Noguchi was able to attend the show, unfortunately not bright enough to be photographed from space …

At about 10 km altitude, the small 40 cm diameter package deployed its parachute to land gently in the Woomera desert. It emitted small radio beeps which were immediately spotted by the antennas of the recovery teams, on site for several weeks. They went to the exact site by helicopter to pick up their cosmic delivery in the early morning.

The small re-entry capsule with its parachute. HANDOUT / AFP
The first on-site recuperators are equipped with protection in the event that the pyrotechnic devices used to trigger the parachute present a risk of explosion. HANDOUT / AFP
The atmospheric re-entry capsule is only 40 cm in diameter! HANDOUT / AFP
It is handled with great care: the Hayabusa-2 mission, of which it was the main objective, cost more than 200 million euros. HANDOUT / AFP
The precious load will now be repatriated to Japan before being opened in an ultra-clean environment to avoid any contamination. HANDOUT / AFP

“After six years of space travel, we were able to bring back a treasure box this morning,” project manager Yuichi Tsuda told a press conference after the operations. This will only be opened in facilities provided for this purpose in Japan. Researchers do not yet know how much grain was harvested. The goal was to bring back at least 100 mg (a tenth of a gram) but they hope to have captured a little more (maybe several grams). The mission having cost more than 200 million euros, this makes it probably the most valuable material in the world!

They were picked up in 2019 on Ryugu, a sort of tetrahedral mountain 900m high, blacker than carbon, rich in organic molecules (molecules whose spine is made up of carbon atoms). The collection operations there were particularly perilous because of its rugged profile (see below).

The asteroid Ryugu seen by the Hayabusa-2 probe. JAXA
Photo taken on the surface of Ryugu by the Franco-German Mascot lander dropped by Hayabusa-2. MASCOT / DLR / JAXA

Remember that apart from the Moon, scientists have almost no sample of matter taken elsewhere than on Earth. Only a few dust collected from the hair of a comet (by the StarDust mission) and micrometric grains – invisible to the naked eye – from the asteroid Itokawa have come back to us to this day …

With Ryugu, this is the first time that researchers will be able to analyze on Earth material taken from a so-called “primitive” asteroid formed at the beginning of the Solar System. As its size is relatively small, gravity and pressure did not play a large geological role there, unlike bodies like the Moon or the Earth. The researchers thus think of opening a window on the infancy of the Solar system.

The Hayabusa-2 probe has not completed its mission. After dropping her package, she indeed proceeded to an avoidance maneuver in order to continue her route around the Sun. It will pass near a new target in 2026: a small asteroid that it will only fly over briefly. Its next real target is a super rotator just a few tens of meters, an asteroid circling around in less than 10 minutes. Scientists have no idea what such an object might look like … But that’s another story.


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