nine occasions. Four of these, 2004, 2010, 2014, and 2019, generated multi-chord data sets and have been used along with adaptive optics imaging and three-dimensional modeling to estimate Psyche's mean diameter, with recent models all converging to an equivalent-volume mean diameter of km.

Mass and bulk density

Psyche is massive enough that its gravity observably perturbs other asteroids' orbits, which can be used to calculate

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