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We develop a shape model of asteroid 16 Psyche using observations acquired ina wide range of wavelengths: Arecibo S-band delay-Doppler imaging, AtacamaLarge Millimeter Array (ALMA) plane-of-sky imaging, adaptive optics (AO) imagesfrom Keck and the Very Large Telescope (VLT), and a recent stellar occultation.Our shape model has dimensions 278 (-4/+8) km x 238 (-4/+6) km x 171 (-1/+5)km, an effective spherical diameter Deff = 222 -1/+4 km, and a spin axis(ecliptic lon, lat) of (36 deg, -8 deg) +/- 2 deg. We survey all the featurespreviously reported to exist, tentatively identify several new features, andproduce a global map of Psyche. Using 30 calibrated radar echoes, we findPsyche's overall radar albedo to be 0.34 +/- 0.08 suggesting that the uppermeter of regolith has a significant metal (i.e., Fe-Ni) content. We find fourregions of enhanced or complex radar albedo, one of which correlates well witha previously identified feature on Psyche, and all of which appear to correlatewith patches of relatively high optical albedo. Based on these findings, wecannot rule out a model of Psyche as a remnant core, but our preferredinterpretation is that Psyche is a differentiated world with a regolithcomposition analogous to enstatite or CH/CB chondrites and peppered withlocalized regions of high metal concentrations. The most credible formationmechanism for these regions is ferrovolcanism as proposed by Johnson et al.(Nature Astronomy vol 4, January 2020, 41-44).

Asteroid 16 Psyche: Shape, Features, and Global Map