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US probe to touch down on asteroid Bennu on October 20
by Staff Writers
Washington (AFP) Sept 24, 2020

After a four-year journey, NASA's robotic spacecraft OSIRIS-REx will descend to asteroid Bennu's boulder-strewn surface on October 20, touching down for a few seconds to collect rock and dust samples, the agency said Thursday.

Scientists hope the mission will help deepen our understanding of how planets formed and life began and provide insight on asteroids that could impact Earth.

"Years of planning and hard work by this team are essentially coming down to putting the TAGSAM (Touch-And-Go Sample Acquisition Mechanism) into contact with the surface for just five to 10 seconds," said Mike Moreau, OSIRIS-REx deputy project manager.

NASA has chosen a site called Nightingale, a rocky area 52 feet (16 meters) in diameter, for the spacecraft's robotic arm to attempt to collect a sample, because it holds the greatest amount of unobstructed fine-grained material.

The spacecraft, about the size of a large van, will need to touch down in an area about the size of a few parking spots, taking care to avoid surrounding boulders.

Because the spacecraft and Bennu will be approximately 207 million miles (334 million kilometers) from Earth, it will take about 18.5 minutes for signals to travel between them.

This prevents the live commanding of flight activities, so the spacecraft will need to perform the sequence autonomously.

OSIRIS-REx is supposed to collect at least 2 ounces (57 grams) of Bennu's rocky material to bring back to Earth -- the largest sample return from space since the Apollo program.

It will deliver its payload to Earth on September 24, 2023.


Related Links
Asteroid and Comet Mission News, Science and Technology


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IRON AND ICE
OSIRIS-REx finds possible pieces of Vesta on Bennu
Greenbelt MD (SPX) Sep 22, 2020
In an interplanetary faux pas, it appears some pieces of asteroid Vesta ended up on asteroid Bennu, according to observations from NASA's OSIRIS-REx spacecraft. The new result sheds light on the intricate orbital dance of asteroids and on the violent origin of Bennu, which is a "rubble pile" asteroid that coalesced from the fragments of a massive collision. "We found six boulders ranging in size from 5 to 14 feet (about 1.5 to 4.3 meters) scattered across Bennu's southern hemisphere and near the e ... read more

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