NASA OSIRIS-REx Probe to Touch Down on Asteroid Bennu on October 20

NASA has chosen a site called Nightingale, a rocky area 16 metres in diameter, for the OSIRIS-REx's robotic arm to attempt to collect a sample.

By Agence France-Presse | Updated: 25 September 2020 13:33 IST

NASA OSIRIS-REx Probe to Touch Down on Asteroid Bennu on October 20

Photo Credit: NASA/ Goddard/ University of Arizona

This artist's rendering shows OSIRIS-REx spacecraft descending towards asteroid Bennu

Highlights

The spacecraft is about the size of a large van
Osiris-Rex and Bennu will be approximately 207 million miles from Earth
It will deliver its payload to Earth on September 24, 2023

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.

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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.

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Because the spacecraft and Bennu will be approximately 207 million miles (334 million kilometres) 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 programme.

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

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