NASA just landed on asteroid Bennu. What you need to know about the mission

NASA just landed on asteroid Bennu. What you need to know about the mission


Artistic performance of NASA’s Osiris Rex spacecraft collecting a sample from the asteroid Bennu.

NASA / Goddard / University of Arizona

Publisher’s Note: Osiris-Rex landed on Bennu. You can find our coverage of the event here. You can find our answers to all of your questions about the mission below.

NASA’s Osiris Rex spaceship short landed on a large asteroid Tuesday to brush some stones and dust from its surface and bring it back to earth for examination. The event is a major first for NASA and a potential boon to science, space exploration, and our understanding of the solar system.

The touch-and-go, or TAG, sample collection from asteroid 101955 Bennu sank around 3:12 p.m. PT. NASA streamed the TAG maneuver live on NASA television and on the agency’s website, and you can re-watch the livestream below. Read on to answer all of your Bennu questions.

When did the mission start?

Osiris-Rex as a concept has existed since at least 2004, when a team of NASA astronomers first proposed the idea. After more than a decade of development, the spaceship is Launch on September 8, 2016 in Cape Canaveral, Floridaon an Atlas V rocket from the United Launch Alliance, a joint venture between Lockheed Martin and Boeing. The spaceship spent the next 26 months cruising to Bennu and officially arrived on December 3, 2018.

Since then, the mission team has spent nearly two years orbiting the diamond-shaped space rock, surveying and mapping its surface in order to select the best sampling point. For the past few months, rehearsals have started ahead of the upcoming sampling attempt and now the team says it is ready to play TAG with Bennu.

Look at that:

NASA successfully lands the Osiris Rex spacecraft on an asteroid …


Why Bennu?

Bennu is what is known as a “debris pile” asteroid, which means that it was formed in the deep cosmic past when gravity slowly compressed the remains of an ancient collision. The result is a body in the shape of a top with a diameter of about 500 meters and a surface strewn with large stones and boulders.

Bennu is said to be a window into the solar system’s past: a flawless, carbon-rich body that carries the building blocks of planets and life. Some of these resources, like water and metals, could also be worth mining at some point in the future for use on Earth or in space exploration.

The asteroid has another property that makes it particularly interesting for scientists and humans in general – it has the chance to affect Earth in the distant future. Bennu ranks second on NASA’s list of impact risks. Current data shows dozens of potential impacts in the last quarter of the 22nd century, though all of them have a tiny chance of actually occurring.

How will TAG work?

For anyone who has ever looked into robots, or maybe even entered a robotics competition, the Osiris Rex mission seems to be the ultimate culmination of a young robot’s dreams. The touch-and-go sampling process is a complex, high-stakes task that has been developing into an important climatic moment for years. If it succeeds, it will play a role in history and our future in space.

The basic plan is for Osiris-Rex Bennu to land on a rock Landing site called Nightingale. The van-sized spacecraft must negotiate building-sized boulders around the landing area to land in a relatively free space that is only as large as a few parking spaces. However, a robotic sampling arm will be the only part of Osiris-Rex that will actually be deposited on the surface. One of the three pressurized nitrogen canisters is fired to stir up a sample of dust and small stones which can then be caught in the arm’s collection head for safe storage and return to earth.

The descent to Bennu’s surface takes about four hours, about as long as the asteroid needs a full revolution. Remarkably, after this slow approach, the actual TAG sampling process takes less than 16 seconds.

The preparation for the TAG did not go exactly as planned. The mission organizers initially hoped that Bennu’s surface would have many potential landing sites, mostly covered with fine materials comparable to sand or gravel. It turns out that Bennu’s surface is extremely rough and doesn’t have any really inviting landing pads.

After spending much of the time reevaluating the mission over the past two years, the team decided to “thread the needle” through the boulder-filled landscape in Nightingale and a few other sample backup locations. It is still possible that the surface will turn out to be too rocky to receive a good sample. If this turns out to be the case, the team can try again at a different location. Osiris-Rex is equipped with three nitrogen canisters to fire and destroy the surface. This means that the team will make up to three attempts to take a sample.

Then what?

Immediately after collecting the sample, Osiris-Rex will fire its engines to retreat from Bennu. The spaceship will hang around Bennu for the rest of 2020 before finally performing a takeoff maneuver next year and embarking on a two-year journey back to Earth.

On September 24, 2023, Osiris-Rex is expected to drop its sample recovery capsule, which will land in the Utah desert and be recovered for study purposes.

Hasn’t that been done yet?

Yes. Japan’s Hayabusa spacecraft successfully returned tiny grains of the asteroid 25143 Itokawa to Earth in 2010. His successor Hayabusa-2, fired a special copper bullet at the large asteroid Ryugu in 2019 and then took part of the splinter. This sample is on its way back to earth.

How can I watch?

Follow NASA’s livestream, which begins Tuesday at 2 p.m. You can also follow that Osiris-Rex Twitter feed to get the latest updates.

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