SwRI-led team finds evidence of hydration on Asteroid Psyche | Science & Technology

At about 140 miles in diameter, Psyche is one of the most massive objects in the main asteroid belt. Previous observations indicate that Psyche is a dense, largely metallic object that could be a leftover core from a planet that experienced a catastrophic collision. On Oct. 13, 2023, NASA launched the Psyche spacecraft, which is traveling 2.2 billion miles to arrive at the asteroid in August 2029.

“Using telescopes at different wavelengths of infrared light, the SwRI-led research will provide different but complementary information to what the Psyche spacecraft is designed to study,” said SwRI’s Dr. Tracy Becker, second author of a new American Astronomical Society’s Planetary Science Journal paper discussing these findings.

“Our understanding of solar system evolution is closely tied to interpretations of asteroid composition, particularly the M-class asteroids that contain higher concentrations of metal,” said Center for Astrophysics | Harvard & Smithsonian’s Dr. Stephanie Jarmak, the paper’s lead author, who conducted much of this research while at SwRI. “These asteroids were initially thought to be the exposed cores of differentiated planetesimals, a hypothesis based on their spectral similarity to iron meteorites.”

The Webb data point to hydroxyl and perhaps water on Psyche’s surface. The hydrated minerals could result from external sources, including impactors. If the hydration is native or endogenous, then Psyche may have a different evolutionary history than current models suggest.

“Asteroids are leftovers from the planetary formation process, so their compositions vary depending on where they…