In the excellent blog on the Rosetta Mission, Rosetta—First Mission to Orbit and Land on a Comet, examples of how to obtain 3D plots of both a massive cuboid and a massive ball are given. However, I am unable to determine how to modify these examples for the case of a massive ellipsoid. In the case of just an ellipsoid, one specifies the x,y,z positions and the ellipsoid dimensions. However, in the case of a massive ellipsoid the position coordinate trio appear to have dimensions of mass. Neither the massive cuboid nor the massive ball have this. Thus a simple application using Graphics3D doesn't work. I was attempting to modify the Rosetta Mission code to model an approach to 16 Psyche (i.e., the new NASA mission to an asteroid).