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Japan says Hayabusa brought back asteroid grains
Posted: 17 November 2010

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KODIAK, Alaska -- Japanese scientists have concluded the Hayabusa probe limped back to Earth with the first flakes of an asteroid ever returned to terrestrial labs from deep space.

Hayabusa captured this image of asteroid Itokawa in 2005. Credit: JAXA
Particles from one of two sample containers inside Hayabusa's return capsule were collected from the surface of Itokawa, the potato-shaped asteroid surveyed by the spacecraft in late 2005.

The Japan Aerospace Exploration Agency, or JAXA, publicly released the results Tuesday in a written statement.

Analysis with a scanning electron microscope identified about 1,500 grains from one sample catcher as rocky particles, according to the JAXA press release.

"Most of them were judged to be of extraterrestrial origin and definitely from asteroid Itokawa," the statement said.

According to researchers, the composition of Hayabusa's samples was more similar to primitive meteorites than known rocks from Earth. The material matches chemical maps of Itokawa from Hayabusa's remote sensing instruments.

JAXA found concentrations of olivine and pyroxene in the Hayabusa samples, the agency press release said.

The particles are also different from native soils at the mission's launch base in southern Japan and landing site in Woomera, Australia.

After Hayabusa's return to Earth in June, scientists opened up the craft's sample container and discovered rocky grains. But confirmation of the material's origin did not come until this week.

Officials retrieved the particles with a special spatula inside a curation facility at Sagamihara, Japan.

Scientists used a special spatula to retrieve particles from the sample canister. Credit: JAXA
Further study of the samples will wait until 2011 because officials are still developing special handling procedures to avoid contaminating the particles during the next phase of research.

Most of the particles are smaller than 10 micrometers.

Scientists have not analyzed samples inside the capsule's other collection chamber, but officials expect it to hold even more material because of its location on the spacecraft.

It lies on the side of the spacecraft that touched Itokawa with the most force during its time at the asteroid, possibly gathering more rock grains.

Hayabusa was designed to collect several hundred milligrams of material if the sampling procedure went as planned, but the craft's projectile gun did not activate when it approached the asteroid.

Scientists expect to learn much about asteroids from even a miniscule sample through powerful tools like scanning electron microscopes.

The Planets
From tiny Mercury to distant Neptune and Pluto, The Planets profiles each of the Solar System's members in depth, featuring the latest imagery from space missions. The tallest mountains, the deepest canyons, the strongest winds, raging atmospheric storms, terrain studded with craters and vast worlds of ice are just some of the sights you'll see on this 100-page tour of the planets.

Hubble Reborn
Hubble Reborn takes the reader on a journey through the Universe with spectacular full-colour pictures of galaxies, nebulae, planets and stars as seen through Hubble's eyes, along the way telling the dramatic story of the space telescope, including interviews with key scientists and astronauts.

3D Universe
Witness the most awesome sights of the Universe as they were meant to be seen in this 100-page extravaganza of planets, galaxies and star-scapes, all in 3D!


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