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Euler diagram showing the IAU Executive Committee conception of the types of bodies in the Solar System. The International Astronomical Union (IAU) defined in August 2006 that, in the Solar System, [1] a planet is a celestial body that: is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
The term 'dwarf planet' arguably contains two words, a noun (planet) and an adjective (dwarf). Thus, the term could suggest that a dwarf planet is a type of planet, even though the IAU explicitly defines a dwarf planet as not so being. By this formulation therefore, 'dwarf planet' and 'minor planet' are best considered compound nouns.
The following is a list of planet types by ... The IAU defines that a planet in the Solar System ... "Regarding the criteria for planethood and proposed planetary ...
According to IAU definition of planet, a planet is an astronomical body orbiting the Sun that is massive enough to be rounded by its own gravity, and has cleared the neighbourhood around its orbit. [4] Another widely accepted geophysical definition of a planet includes that which was put forth by planetary scientists Alan Stern and Harold ...
"Clearing the neighbourhood" is one of three necessary criteria for a celestial body to be considered a planet in the Solar System, according to the definition adopted in 2006 by the International Astronomical Union (IAU). [1] In 2015, a proposal was made to extend the definition to exoplanets. [2]
For instance, IAU does not disapprove of astronomers discussing Jupiter in Arabic using the traditional Arabic name for the planet, المشتري Al-Mushtarīy. Some sixty years after the discovery of Pluto, a large number of large trans-Neptunian objects began to be discovered.
The assessments of the IAU, Tancredi et al., Brown, and Grundy et al. for some of potential dwarf planets are as follows. For the IAU, the acceptance criteria were for naming purposes; Quaoar was called a dwarf planet in a 2022–2023 IAU annual report. [24]
To found an authority on planetary nomenclature, the International Astronomical Union (IAU) was organized in 1919 to designate and standardize names for features on Solar System bodies. [2] The heart-shaped Tombaugh Regio, on Pluto, is named after the planet's discoverer Clyde Tombaugh.