Launched to the world's near-total indifference on May 9 2003, the little probe Hayabusa ("Falcon") is now on the brink of rendezvousing with a 630-metre (yard) asteroid on a mission that could prove historic.

If all goes well, Hayabusa will be the first spacecraft to bring home raw material from an asteroid, part of the primeval rubble left over from the making of the Solar System.

"It is an utterly remarkable project which has been given almost little coverage in the media," Patrick Michel, a French astrophysicist who is involved in the mission, told AFP on Monday at a meeting of astronomers here.

"Understanding the chemical composition of asteroids will help us to understand how the planets were made. But the only asteroids we see on Earth are as scorched remains, as meteorites, not the raw substance itself."

Hayabusa, driven by an ion engine, a slow-but-steady form of propulsion which leaves maximum volume for scientific instruments, is now just 750 kilometers (475 miles) from the asteroid Itokawa, the mission website (www.jaxa.jp) of the Japanese Aerospace Exploration Agency (JAXA), said on Monday

In November comes the white-knuckle part of the mission, said Michel, who works at the Cote d'Azur Observatory in southern France and with the French National Centre for Space Research (CNRS).

Hayabusa will gingerly manoeuvre itself to within a few metres (yards) of Itokawa and then fire a projectile weighing about five grammes (1/5th of an ounce) into the surface at a speed of 300 metres (325 feet) per second, or around 1,800 kms (1,125 miles) an hour.

If the arithmetic is right and luck is on Hayabusa's side, material will be kicked out of the asteroid and some of it will shoot up a slender funnel.

The pellets are scheduled to be shot at three different sites in the asteroid, with each tiny sample being carefully stowed away onboard.

The spacecraft will also deploy a little robot, about the size of a large beer can, called Minerva, which for a couple of days will "hop" around the asteroid's surface, taking pictures and measuring the temperature.

Then it will be time to head for home. In June 2007, Hayabusa's precious payload, of just 100 milligrammes, should land in the Australian Outback.

The United States and the European Space Agency (ESA) have deployed huge resources on media-friendly missions to analyse comets and other primitive phenomena.

They include ESA's Rosetta, a one-billion-euro (1.2-billion-dollar) mission, due to climax in 2014, to deploy a robot lab on a comet and analyse its soil and transmit the data back home.

In its Deep Impact mission, the United States fired a metal projectile into a comet last July, using remote sensors to analyse the gas and dust spewed out by the impact.

Another US craft, Stardust, is due to return next year with material scooped by flying through the wake of a comet.

And it sent a spacecraft, Genesis, to capture samples of the solar wind. The craft crashed into the Utah desert in September 2004, but some of its samples were saved.

"I'm going to be thrilled if the Japanese do this. I wish them all of the luck in the world," Carey Lisse, a senior scientist at Johns Hopkins University in Maryland and a member of the Deep Impact science team.

"With all these missions, we're going to have a revolution in our understanding of these first bodies that formed the Solar System."

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