Editing 16 Psyche (section)

===Shape and spin pole===
The first published three-dimensional shape model for Psyche was derived from an analysis of numerous 
[[Lightcurve|light curves]].<ref name="Kaasalainen-etal-2002" /> Since then, additional refinements to the shape have been made based on the inversion of lightcurves, adaptive optics observations, radar observations, thermal imaging, and occultations.<ref name="Hanuš-Viikinksk-etal-2017" /><ref name="Shepard-Richardson-etal-2017" /><ref name = Drummond_etal_2018/><ref name="Viikinksk-Vernza-etal-2018" /><ref name="Ferrais-Vernazza-etal-2020" /><ref name="Shepard2021" /><ref name="Vernazza2021" /> The most recent models show that Psyche has a shape consistent with a [[Jacobi ellipsoid]] and dimensions within a few km of 278&nbsp;km x 238&nbsp;km x 171&nbsp;km.<ref name="Viikinksk-Vernza-etal-2018" /><ref name="Vernazza2021" /><ref name="Shepard2021" /><ref name="Ferrais-Vernazza-etal-2020" />

Each shape model provides an estimate of the direction of the north pole (spin axis). All recent models for Psyche suggest it rotates about a pole pointed towards the [[ecliptic coordinate system|ecliptic coordinates]] (long, lat) {{nowrap|''λ'' {{=}} 35°}}, {{nowrap|''β'' {{=}} −8°}},  with a 3° uncertainty.<ref name="Hanuš-Viikinksk-etal-2017"/><ref name="Shepard-Richardson-etal-2017" /><ref name="Drummond_etal_2018" /><ref name="Viikinksk-Vernza-etal-2018" /><ref name="Ferrais-Vernazza-etal-2020" /><ref name="Shepard2021" /> This means that it is essentially tilted toward the ecliptic, with an [[axial tilt]] of 98°.

{{multiple image
| align = left
| direction = vertical
| total_width = 220
 |image1 = Psyche_ellipsoid_shape.png | caption1 = View of Psyche from its south pole with a best fit ellipsoid overlain. Major deviations from the ellipsoid shape are referred to as Alpha, Bravo, and Charlie.
| image2 = 16PsycheNorthView.gif | caption2 = Animation of a Psyche shape model viewed from 20° north latitude. The red peg is at 0° longitude.
| image3 = 16PsycheSouthView.gif | caption3 = Animation of a Psyche shape model viewed from 20° south latitude. The red peg is at 0° longitude.
}}