 The NASA Infrared Telescope Facility at the Mauna Kea Observatories reported evidence (~3 μm absorption feature) of hydroxyl ions on the asteroid in October 2016 that may suggest water ice.Since Psyche is thought to have formed under dry conditions without the presence of water, the hydroxyl may have reached Psyche via past impacts from smaller carbonaceous asteroids.Psyche appears to be an exposed metallic core or a fragment of a metallic core from a larger differentiated parent body some 500 kilometers in diameter.