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Asteroid (16) Psyche is notable for the largest M-type asteroid and has thehigh radar albedo among the main-belt asteroids. The object is likely a mixtureof metal and silicates because of its lower bulk density than metallicmaterials and observations inferring the existence of silicate materials on thesurface. Here, we numerically investigate the interior layout when thestructure of Psyche consists of a spherical iron core and two types ofsilicate-rich layers (compressed and uncompressed ones resulting from thecompaction process. We develop an inverse problem algorithm to determine thelayout distribution by combining a Finite Element Model approach that accountsfor density variations and constrains pressure-based crushing conditions. Theresults show that given the crushing limit of 10 MPa the smallest core sizelikely reaches 72 km in radius, and the silicate-rich layer, consisting of bothcompressed and uncompressed regions, has a thickness ranging up to 68 km. Tosupport the localized metal concentration at the crater-like region detected inthe recent radar observation, we give more constraints on the minimum core sizewhich takes up to 34 - 40 % of the entire size of Psyche. Our study alsoaddresses that the ferrovolcanic surface eruptions could still be a source ofmetal-rich materials. Finally, while the differentiated structure having aspherical core condition is just part of potential scenarios, the present studyinfers that the core and compressed layer conditions likely control the surfacecondition.

A numerical approach using a finite element model to constrain the possible interior layout of (16) Psyche