Dwarf Planets

Dwarf planet was a term originally defined by the Pre-Astro Terran International Astronomical Union in 2006 as In this original definition, unlike "dwarf stars" which are simply small stars, "dwarf planets" were not considered planets.
 * 1) is in orbit around the Sun (Sol),
 * 2) has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
 * 3) has not "cleared the neighborhood" around its orbit.

This definition prevailed until it was reexamined by the Science Council following Pluto successfully regained the status of Planet in 2299 by Assembly decision. Currently, only two criteria are used in determining if an object is a planet:

Different types of planets may receive one or more of several qualifiers based on the type of orbit, size, composition and surface conditions.
 * 1) Does the object have sufficient mass to assume hydrostatic equilibrium.
 * 2) Does the object have a true mass below the limiting mass for thermonuclear fusion of deuterium (currently calculated to be 13 Jupiter masses for objects of solar metallicity).