IAU definition of planet

The definition of planet set in Prague, Czech Republic in August 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which: 1. * is in orbit around the Sun, 2. * has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and 3. * has "cleared the neighborhood" around its orbit.

IAU definition of planet

The definition of planet set in Prague, Czech Republic in August 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which: 1. * is in orbit around the Sun, 2. * has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and 3. * has "cleared the neighborhood" around its orbit.