Objects formerly considered planets See also: List of former planets The table below lists Solar System bodies once generally considered to be planets but no longer considered as such by the IAU, as well as whether they would be considered planets under alternative definitions, such as Soter's 2006 definition[69] that favors dynamical dominance or Stern's 2002[73] and 2017 definitions[74] that favor having a shape dominated by gravity. Body IAU classification Dynamical dominance Gra...