Note the difference between plutoid andSmall bodies similar to the nether world（plutino）。
history
Announce
edit
Before being named, this new typeInternational Astronomical UnionIt was suggested in the general meeting that“plutonORplutonian object"（Plutonian Object ）, but these were rejected.The former was rejected because“pluton"Is an existing geological term, manygeologistThey all objected, so they were rejected in the middle of the editorial review and rejected in the final 6b bill;"Plutonian object"（Plutonian Object ）BecauseplutonianIt is an adjective that has existed before, so it failed to win the majority support in the vote of 183 to 186 in the General Assembly on August 24, 2008. Therefore, many astronomers call it“gas giant ”We continue to use the term "ice dwarf" to refer to such objects.
At the initial stage, the definition of this category is not clear.Initially (when called "pluton") IAUPlanetary definitionThe Committee proposed on August 16, 2006planetThe newly defined No. 5 motion, in which the concept of planet is proposed at the same time - it takes more than 200 hours to make one revolutionJulian yearAnd the orbits of the eight planets discovered in 1900 are inclined (with a larger angle to the ecliptic plane) and elliptical.This proposal will change (deprive) Pluto's status (qualification) as a planet. This classification type based on period, orbital inclination and eccentricity meetsExtraNeptune objectsA dwarf planet similar to Pluto in China was rejected during the internal review on August 24, and the final resolution deviated from the original definition, even the name was created later.
Following the general meeting of IAU, the Small Object Naming Committee (CSBN) accepted that the third branch wouldPlanetary systemThe proposal of the Working Group on Naming Principles (WGPSN) was adopted by the IAU Executive Committee at its meeting held in Oslo, Norway, on June 11, 2008Pluto like dwarf planet(plutoid)。The new name was announced after the meeting of the Executive Committee, which is a very simple definition: allExtraNeptune objectsThe dwarf planets in are all like pluto dwarf planets.
"Pluto like dwarf planet" will not collide with other stars during its operation.Conform to 2006International Astronomical Union12 newly definedSolar system planetsPluto, "Charon" and "2003UB313" are all "Pluto like dwarf planets".Astronomers believe that the orbits of "Pluto like dwarf planets" are usually not regular circles, but ellipses with large eccentricity.The origin of such planets may be different from other planets in the solar system.With the improvement of observation methods, astronomers may find more large objects at the edge of the solar system.In the future, if the list of planets in the solar system continues to expand, the new one will also be "Pluto like dwarf planets".
brief introduction
Announce
edit
yesPluto、Eris 、Bird God StarThe four dwarf planets and Triton are similar to Pluto dwarf planets recognized by the International Astronomical Union.
