Barnouin: Most of Bennu's craters are on its ridge, so its ridge formed early. Best fit ellipsoid 505.6 +/-0.1; 492.4 +-0.2; 457.4 +/-0.3 m. #LPSC2019 but it's nonspherical, not only equatorial ridge but also with longitudinal deviations from spherical.

— Emily Lakdawalla (@elakdawalla) March 19, 2019