Touchdown: Japan probe Hayabusa2 lands on distant asteroid

The Ryugu asteroid is thought to contain clues about the origins of life
The Ryugu asteroid is thought to contain clues about the origins of life

A Japanese probe sent to collect samples from an asteroid 300 million kilometres away for clues about the origin of life and the solar system landed successfully on Friday, scientists said.

Hayabusa2 touched down briefly on the Ryugu asteroid, fired a bullet into the surface to puff up dust for collection and blasted back to its holding position, said officials from the Japan Aerospace Exploration Agency (JAXA).

A live webcast of the control room showed dozens of JAXA staff members nervously monitoring data ahead of the touchdown before exploding into applause after receiving a signal from Hayabusa2 that it had landed.

"We made a successful touchdown, including firing a bullet" into the Ryugu asteroid, Yuichi Tsuda, Hayabusa2 project manager, told reporters.

"We made the ideal touchdown in the best conditions," he said.

The complicated procedure took less time than expected and appeared to go without a hitch, said Hayabusa2 mission manager Makoto Yoshikawa.

"I'm really relieved now. It felt very long until the moment the touchdown happened," he said.

He said the firing of the bullet—the first of three planned in this mission—"will lead to a leap, or new discoveries, in planetary science."

The asteroid is thought to contain relatively large amounts of organic matter and water from some 4.6 billion years ago when the solar system was born.

The stages of the Hayabusa2 space mission
Main stages of Japan's Hayabusa2 space mission which is due to land on the asteroid Ryugu on Friday, February 22.

During a later mission, Hayabusa2 will eventually fire an "impactor" to blast out material from underneath Ryugu's surface, allowing the collection of "fresh" materials unexposed to millennia of wind and radiation.

Scientists hope those samples may provide answers to some fundamental questions about life and the universe, including whether elements from space helped give rise to life on Earth.

Queen rocker and space fan Brian May tweeted: "Hurrah. Brilliant success in touchdown on Ryugu."

Spinning-top shape

Communication with Hayabusa2 is cut off at times because its antennas are not always pointed towards Earth and it could take several more days to confirm the bullet was actually fired to allow the collection of samples.

The mission has not been completely plain sailing and the probe's landing was originally scheduled for last year.

But it was pushed back after surveys found the asteroid's surface was more rugged than initially thought, forcing JAXA to take more time to find a suitable landing site.

Scientists are now poring over the data sent 300 million kilometres back to Earth
Scientists are now poring over the data sent 300 million kilometres back to Earth

The Hayabusa2 mission, with a price tag of around 30 billion yen ($270 million), was launched in December 2014 and is scheduled to return to Earth with its samples in 2020.

Photos of Ryugu—which means "Dragon Palace" in Japanese and refers to a castle at the bottom of the ocean in an ancient Japanese tale—show an asteroid shaped a bit like a spinning top with a rough surface.

Hayabusa2 observes the surface of the asteroid with its camera and sensing equipment but has also dispatched two tiny MINERVA-II rover robots as well as the French-German robot MASCOT to help surface observation.

Scientists have already received data from these probes deployed on the surface of the asteroid.

At about the size of a large fridge, Hayabusa2 is equipped with solar panels and is the successor to JAXA's first asteroid explorer, Hayabusa—Japanese for falcon.

That probe returned from a smaller, potato-shaped, asteroid in 2010 with dust samples despite various setbacks during its epic seven-year odyssey and was hailed as a scientific triumph.


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Feb 22, 2019
First Conquer the Earth, then the Universe; We still do not have enough light on the Roads, but are trying to collect dust from Asteroids. Even though we have a century old renewable energy technology in our hands, we are still sticking to Coal & Fossil Fuels. This Planet is covered 3/4 of it with Sea Water and We are laying Solar Panels over our Residences. Why not use Floating panels over there? We live at the most for 80 yrs and want to safeguard the lives of animals. What is for Evolution? Let them move away from them ! We just need Plants, not dumb animals. The Roads in the Nights should be almost like day time, at least in big cities !

Feb 22, 2019
I've got to say that the moderators on the phys.org site have been doing a poor job removing bad posts. I've reported a number of bad posts, like these 2 spam posts, only to come back later and see that they are still being shown. MODERATORS: please have quicker turnaround when people report posts and do your job to delete them quickly. And if necessary close these bad accounts. THANKS!

Feb 25, 2019
F.. The Roads in the Nights should be almost like day time, at least in big cities !


Maybe you are joking. ... I happen to live in one of those dreaded lit up cities, and I do not like not being able to see the stars at night anymore. It is the reason I'm looking forward to moving away to a better place.

After having removed the stars from above, I am guess cutting down all the trees is next.

Feb 25, 2019
If you want your streets fully lit, enclose em so the rest of us can enjoy the night, stars, insects & bats, and the like. Light pollution is a real thing.

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