List of trans-Neptunian objects
This is a list of trans-Neptunian objects, which are minor planets in the Solar System that orbit the Sun at a greater distance on average than Neptune, which means all of their orbits have a semi-major axis greater than 30.1 astronomical units. The Kuiper belt, scattered disc, and Oort cloud are three conventional divisions of this volume of space., the catalog of minor planets contains [#List|1,037 numbered TNOs]. In addition, there are 4,518 unnumbered TNOs, which have been observed since 1993. This list consists of all types of TNO subgroups: classical Kuiper belt objects, also known as "cubewanos", the resonant trans-Neptunian objects with their main and higher-order resonant subgroups, the scattered disc objects, and the extreme trans-Neptunian objects including the ESDOs, EDDOs, and sednoids, which have a semi-major axis of at least 150 AU and a perihelion greater than that of Neptune. The list also contains several centaurs, if the object's orbit has a sufficiently large semi-major axis. Centaurs have unstable orbits in which the perihelion is well inside of Neptune's orbit but the farthest point is very distant. The first TNO to be discovered was Pluto in 1930. It became the namesake of a larger group of resonant objects called plutinos. It took more than 60 years to discover a second TNO, Albion, in 1992. The largest known trans-Neptunian objects are Pluto and, followed by,,,,, and, all of them being officially recognized as dwarf planets by the IAU except for Gonggong, Sedna, and Orcus. There are also many possible dwarf planets, such as, Máni,,, and. Most TNOs have low albedos typically around 0.09. Their color varies from blue-grey to very red. The following list also gives an object's full designation, mean-diameter, and discovery circumstances, as well as its orbital inclination and eccentricity. ListThis list includes all numbered trans-Neptunian objects with a semi-major axis greater than 30.1 astronomical units, Neptune's average orbital distance from the Sun. The data is sourced from MPC's "List of Trans Neptunian Objects", "List Of Centaurs and Scattered-Disk Objects", "List of Neptune Trojans", "List Of Other Unusual Objects", and "Database Search", completed with remarks and information from Johnston's Archive.Unnumbered TNOsThere are 4,518 unnumbered trans-Neptunian objects, defined here as minor planets with a semi-major axis larger than 30.1 AU. The data is sourced from MPC's "List of Trans Neptunian Objects", "List Of Centaurs and Scattered-Disk Objects", "List Of Other Unusual Objects", and "Database Search", completed with information from Johnston's Archive. For the list of numbered TNOs, see .Trans-Neptunian satellitesA growing number of TNOs are revealed to be binary systems with a minor-planet moon orbiting its primary. There are also several multiple systems with more than one satellite.Diagram: orbital classesTrans-Neptunian objects colorized by their orbital subclass and plotted in the orbital parameter space. The plot for the entire region contains 1418 objects including plutinos, twotinos, other resonant objects, cubewanos, inner and outer classical objects, SDOs, sednoids, centaurs and other TNOs. |