Dec. 3, 2018: Japan's Hayabusa2 Probe Takes Its Place Beside the Asteroid Ryugu to Begin a Hunt for Buried Secrets of the Solar System
On Dec. 3, 2018, the Japan Aerospace Exploration Agency's Hayabusa2 spacecraft was in position at the asteroid Ryugu, a dark, spinning object roughly half a mile wide that orbits the Sun far from any ordinary neighborhood. It had launched in December 2014. The goal was to touch the surface, collect material, and bring it home.
The Rendezvous
Hayabusa2 was the successor to the original Hayabusa, which returned a tiny amount of dust from the asteroid Itokawa in 2010 after a famously troubled journey. This time JAXA aimed at a carbon-rich asteroid, a type thought to preserve material from the early solar system, including possible clues about water and organic compounds. The spacecraft had reached Ryugu's vicinity in June 2018, using ion engines to match the asteroid's path and to hover at a distance of about twelve miles. In the months that followed, its cameras revealed a surface far rockier than scientists had expected, strewn with boulders and lacking the smooth, sandy patches mission planners had hoped might make a safe landing zone. Controllers would have to rethink their choices. The mission team had picked a target the shape of a spinning top, then found it covered in obstacles.
The work of the following year went on to include small hopping rovers released onto the surface, a copper impactor that blasted an artificial crater, and two touchdowns to gather samples, including material from beneath the surface. Hayabusa2 left Ryugu in November 2019 and in December 2020 dropped a capsule over the Australian outback. The capsule held about 5.4 grams of dark grains, far more than the mission's target of 0.1 gram. Analysis later found organic molecules and amino acids in the samples. A probe built to fetch a pinch of dust returned with a heavy payload, from a rock that had spent billions of years drifting through the dark.
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