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NASA has more than twice the asteroid Bennu samples it could have hoped for from OSIRIS-REx probe

February 17, 2024
in Science
NASA has more than twice the asteroid Bennu samples it could have hoped for from OSIRIS-REx probe
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a silver metal cannister containing dark grey pebbles

View of the OSIRIS-REx Touch-and-Go-Sample-Acquisition-Mechanism (TAGSAM) head with lid removed, unveiling the bulk of asteroid Bennu sample inside.
(Image credit: NASA/Erika Blumenfeld/Joseph Aebersold)

We now know exactly how much material OSIRIS-REx captured from its target asteroid Bennu — and, it’s a lot. 

In addition to the 2.48 ounces (70.3 grams) of sample already collected from the outside of the canister, NASA has finally managed to fully open OSIRIS-REx’s sample container to find another 1.81 ounces (51.2 grams) of asteroid Bennu within. In all, the probe collected more than twice what scientists had hoped for.

OSIRIS-REx completed its asteroid sample return mission when the probe parachuted a tightly-sealed container back to Earth on Sep. 24 before embarking on a secondary mission dubbed OSIRIS-APEX, named for its next space rock target, the asteroid Apophis. 

With this container came the first pieces of an asteroid NASA has ever captured and returned for further study. The mission launched in 2016, and the safe recovery of the capsule last year was the ceremonious end to an epic seven-year journey through space. However, once NASA technicians got a hold of the sample container, they stumbled upon some complications — it was too difficult to open. 

Related: Asteroid Bennu may ‘a fragment of an ancient ocean world,’ samples suggest

OSIRIS-REx’s original mission goal was to collect up to 2.12 ounces (60 grams) of material, which was actually met with even just bits of Bennu spotted across the container’s exterior. However, the team knew there had to be much more inside. 

So, in order to access the entirety of the Bennu sample, NASA teams started designing a new tool to open the sealed container.

To talk specifics, the container was actually secured inside a larger enclosure, built for protection during the probe’s arduous journey. As OSIRIS-REx collected its asteroid samples in space, a portion of the material wound up inside this protective enclosure but outside the designated sample container, gifting scientists some of the  Bennu sample before the main canister was unlocked.

Far exceeding their expectations, mission operators managed to collect 2.48 ounces (70.3 grams) before ever opening the inaccessible part of the OSIRIS-REx return capsule. Still, scientists and space enthusiasts everywhere remained waiting to see what OSIRIS-REx’s grand sample total would be. And now, the new tool having been derived, scientists have access to all of the probe’s asteroid sample, and the results are in.

Combined with the samples already collected, OSIRIS-REx returned a total of 4.29 ounces (121.6 grams) of material from asteroid Bennu — that’s more than double the mission’s goal and the largest asteroid sample ever collected, according to a recent NASA release. For comparison, the Japanese Aerospace Agency’s Hayabusa2 mission only brought back about 0.18 ounces (5 grams) of material from its asteroid target, Ryugu, in Dec. 2020. 

Examination of the samples has already begun, and scientists are finding “a whole realm of material” previously inaccessible using samples collected from meteorites, according to Dante Lauretta, principal investigator for OSIRIS-REx. Bennu is believed to be a remnant of the early solar system, and scientists think studying these samples could help unravel some mysteries of early planetary development.

About a quarter of the Bennu sample will remain with researchers on the OSIRIS-REx research team. NASA also plans to preserve at least 70 percent of the sample for study by scientists worldwide, as well as for future generations of researchers.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Breaking space news, the latest updates on rocket launches, skywatching events and more!

Josh Dinner is Space.com’s Content Manager. He is a writer and photographer with a passion for science and space exploration, and has been working the space beat since 2016. Josh has covered the evolution of NASA’s commercial spaceflight partnerships, from early Dragon and Cygnus cargo missions to the ongoing development and launches of crewed missions from the Space Coast, as well as NASA science missions and more. He also enjoys building 1:144 scale models of rockets and human-flown spacecraft. Find some of Josh’s launch photography on Instagram and his website, and follow him on Twitter, where he mostly posts in haiku.

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