what is iau?
The International Astronomical Union
IAU definition of planet
The International Astronomical Union (IAU)
in 1930 what name was not on the short-list of potential names for the planet pluto "Zeus" who discovered it initially? Percival Lowell when was it? March 19 and April 7, 1915 how is it classified? Dwarf planet or Minor Planet
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IAU definition of planet [SEP] Introduction
The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, a planet is a celestial body which: Among other things, this definition caused Pluto to no longer be classified as a planet, a change from how it had been widely considered until that point. A non-satellite body fulfilling only the first two of these criteria (such as Pluto) is classified as a "dwarf planet". According to the IAU, "planets and dwarf planets are two distinct classes of objects". In other words, "dwarf planets" are not planets. A non-satellite body fulfilling only the first criterion is termed a "small Solar System body" (SSSB).