How does the new planet definition affect the other “planets” that were being considered?
Pluto and Ceres are both dwarf planets. Charon is a satellite of a dwarf planet. Xena’s status is undetermined until someone makes a convincing argument (or resolves its disk with an image; this might have been done. I don’t know) that it is spherical. It should be, given how bright it is (which implies a certain size and thus mass) but it is an IAU comission that needs to be convinced. Here is the text of the adopted IAU resolutions 5A and 6A. You can read them and also 5B and 6B (which did not pass) at the link below. ——- RESOLUTION 5A The IAU therefore resolves that planets and other bodies in our Solar System be defined into three distinct categories in the following way: (1) A planet1 is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. (2) A dwarf planet is a celestial body tha
