Asteroid 16 Psyche might not be what scientists expected

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UArizona undergraduate student David Cantillo is lead author of a new paper published in The Planetary Science Journal that proposes 16 Psyche is 82.5% metal, 7% low-iron pyroxene and 10.5% carbonaceous chondrite that was likely delivered by impacts from other asteroids. Cantillo and his collaborators estimate that 16 Psyche’s bulk density — also known as porosity, which refers to how much empty space is found within its body — is around 35%. These estimates differ from past analyses of 16 Psyche’s composition that led researchers to estimate it could contain as much as 95% metal and be much denser.

“That drop in metallic content and bulk density is interesting because it shows that 16 Psyche is more modified than previously thought,” Cantillo said. “Having a lower metallic content than once thought means that the asteroid could have been exposed to collisions with asteroids containing the more common carbonaceous chondrites, which deposited a surface layer that we are observing,” Cantillo said. This was also observed on asteroid Vesta by the NASA Dawn spacecraft.

Asteroid 16 Psyche is about the size of Massachusetts, and scientists estimate it contains about 1% of all asteroid belt material. First spotted by an Italian astronomer in 1852, it was the 16th asteroid ever discovered. Asteroid 16 Psyche has been estimated to been worth $10,000 quadrillion (that’s $10,000 followed by 15 more zeroes), but the new findings could slightly devalue the iron-rich asteroid.

“Psyche as a rubble pile would be very unexpected, but our data continues to show low-density estimates despite its high metallic content,” Cantillo said. Rather than being an intact exposed core of an early planet, it might actually be closer to a rubble pile, similar to another thoroughly studied asteroid — Bennu. UArizona leads the science mission team for NASA’s OSIRIS-REx mission, which retrieved a sample from Bennu’s surface that is now making its way back to Earth.

The other well-studied asteroid, Bennu, contains a lot of carbonaceous chondrite material and has porosity of over 50%, which is a classic characteristic of a rubble pile. “This is the first paper to set some specific constraints on its surface content. Earlier estimates were a good start, but this refines those numbers a bit more,” Cantillo said.

Past estimates of 16 Psyche’s composition were done by analyzing the sunlight reflected off its surface. The pattern of light matched that of other metallic objects. Cantillo and his collaborators instead recreated 16 Psyche’s regolith — or loose rocky surface material — by mixing different materials in a lab and analyzing light patterns until they matched telescope observations of the asteroid. There are only a few labs in the world practicing this technique, including the UArizona Lunar and Planetary Laboratory and the Johns Hopkins Applied Physics Laboratory in Maryland, where Cantillo worked while in high school. Such high porosity is common for relatively small and low-mass objects such as Bennu — which is only as large as the Empire State Building — because a weak gravitational field prevents the object’s rocks and boulders from being packed together too tightly. But for an object the size of 16 Psyche to be so porous is unexpected. “The opportunity to study an exposed core of a planetesimal is extremely rare, which is why they’re sending the spacecraft mission there,” Cantillo said, “but our work shows that 16 Psyche is a lot more interesting than expected.”

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