NASA's asteroid-sampling mission will bid farewell to asteroid Bennu today

Catastrophe

"There never was a good war, or a bad peace."

rod

Oct 22, 2019
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As the space.com article says "NASA launched the $800-million mission in 2016 as the first U.S. asteroid sample-collection mission. The probe, which follows two successful Japanese missions to sample asteroids, collected 2.1 ounces (60 grams) of samples from Bennu in the fall of 2020. OSIRIS-REx will deliver that material in 2023."

This should be plenty of material to test for various ages found on Bennu. Bennu is in an orbit that does not last billions of years or many millions of years, see Studying craters on asteroid Bennu shows how long it has been orbiting near Earth, https://phys.org/news/2020-10-craters-asteroid-bennu-orbiting-earth.html, "...And because Bennu moved into a near-Earth orbit, those smaller craters represent the timeline of its move to the new orbit. By studying the size and depth of those craters using data from OSIRIS-Rex, the researchers were able to estimate their age—approximately 1.75 million years—which also shows how long Bennu has been in a near-Earth orbit."

So very young CRE ages will likely be found and very old radiometric ages as well as present orbit dynamics indicating a young orbital history in the heliocentric solar system. If reported with different ages found, that would be interesting to read about. Reconciling with Clair Patterson fixed age for the Earth and solar system may be needed. OSIRIS-REX FINDS SOME OF SOLAR SYSTEM'S OLDEST ROCKS ON BENNU, https://skyandtelescope.org/astronomy-news/osiris-rex-oldest-rocks/, “The results are convincing.” "MAKING SOLAR SYSTEM HISTORY Half-kilometer Bennu is likely a chip off that planetesimal block, formed from the debris in a catastrophic collision that happened some 0.8 to 1.5 billion years ago. It probably belongs to one of either the Eulalia or Polona asteroid families, both of which originated in collisions at about that time, says Daniella DellaGiustina (University of Arizona). Then, sometime between a few million and a few tens of millions of years ago, gravitational interactions with the giant planets and long-term interactions of solar radiation with spinning bodies shifted Bennu to its current near-Earth orbit..."

Care will be needed to reconcile different ages if found on the material returned with dating reports for Bennu already published too.
 

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