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Definition of planet
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Source: "IAU 2006 General Assembly: Resolutions 5 and 6". IAU. August 24, 2006. Archived from the original on June 20, 2009. Retrieved June 23, 2009.
Sketch of the heliocentric model of the Solar System by Copernicus
Sketch of the heliocentric model of the Solar System by Copernicus
Proteus, a moon of Neptune, is irregular, despite being larger than the spheroidal Mimas.
Proteus, a moon of Neptune, is irregular, despite being larger than the spheroidal Mimas.
The brown dwarf Gliese 229B in orbit around its star, later found to be binary
The brown dwarf Gliese 229B in orbit around its star, later found to be binary
The solitary Cha 110913-773444 (middle), a possible sub-brown dwarf, set to scale against the Sun (left) and the planet Jupiter (right)
The solitary Cha 110913-773444 (middle), a possible sub-brown dwarf, set to scale against the Sun (left) and the planet Jupiter (right)
IAU definition of planet
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The International Astronomical Union adopted in August 2006 the definition made by Uruguayan astronomers Julio Ángel Fernández and Gonzalo Tancredi which stated that, in the Solar System, a planet is
Definition of planet
…its vicinity) or it is defined to be in hydrostatic equilibrium (it has become gravitationally rounded and compacted). These may be characterized as the dynamical dominance definition and the geophysical definition. The issue of a clear definition for planet came to a head in January 2005 with the discovery of the trans-Neptunian…
The original proposal would have immediately added three planets, shown here in a size comparison to Earth. Leftmost is Pluto (shown in lieu of Eris,
The original proposal would have immediately added three planets, shown here in a size comparison to Earth. Leftmost is Pluto (shown in lieu of Eris, which is about the same size), then Charon, Ceres, and Earth
The twelve "candidate planets" that were possibilities for inclusion under the originally proposed definition. Note that all but the last three are tr
The twelve "candidate planets" that were possibilities for inclusion under the originally proposed definition. Note that all but the last three are trans-Neptunian objects. The smallest three (Vesta, Pallas, Hygiea) are in the asteroid belt.
Plenary session of the IAU General Assembly on August 24, 2006. Votes were cast by raising yellow cards.
Plenary session of the IAU General Assembly on August 24, 2006. Votes were cast by raising yellow cards.