This is a list of unnumbered
trans-Neptunian object
A trans-Neptunian object (TNO), also written transneptunian object, is any minor planet in the Solar System that orbits the Sun at a greater average distance than Neptune, which has a semi-major axis of 30.1 astronomical units (au).
Typically, ...
s (TNOs) first observed since 1993 and grouped by the year of
principal provisional designation. The data is sourced from the
Minor Planet Center
The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory.
Function
...
's (MPC) ''List of Trans Neptunian Objects'' and ''List Of Centaurs and Scattered-Disk Objects''.
These objects will eventually be
numbered as secured discoveries with an official
discoverer determined by the MPC. Until then, additional observations are needed to sufficiently decrease an object's
orbital uncertainty. , there are
3,141 unnumbered objects, defined here as
minor planet
According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...
s with a
semi-major axis
In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the two most widely separated points of the perimeter. The semi-major axis (major semiaxis) is the long ...
larger than 30.1
AU (Neptune's average orbital distance from the Sun).
The list also contains information from "Johnston's Archive", such as an object's diameter, its dynamical class and
binary status with the satellite's diameter, as well as its
albedo
Albedo (; ) is the measure of the diffuse reflection of sunlight, solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body ...
,
spectral taxonomy and
B–R color index.
Members of the
extreme trans-Neptunian object
An extreme trans-Neptunian object (ETNO) is a trans-Neptunian object orbiting the Sun well beyond Neptune (30 AU) in the outermost region of the Solar System. An ETNO has a large semi-major axis of at least 150–250 AU. Its orbit is m ...
s (
ESDOs,
EDDOs and
sednoid
A sednoid is a trans-Neptunian object with a perihelion well beyond the Kuiper cliff at . Only four objects are known from this population: 90377 Sedna, , 541132 Leleākūhonua (), and , but it is suspected that there are many more. All four ha ...
s) – with a semi-major axis greater than 150 AU and
perihelion
An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. For example, the apsides of the Earth are called the aphelion and perihelion.
General description
There are two apsides in any ellip ...
greater than 30 AU – are also identified.
Statistics
List
1993
1994
1995
1996
1997
1998
1999–2007
*
List of unnumbered trans-Neptunian objects: 1999
*
List of unnumbered trans-Neptunian objects: 2000
*
List of unnumbered trans-Neptunian objects: 2001
*
List of unnumbered trans-Neptunian objects: 2002
*
List of unnumbered trans-Neptunian objects: 2003
*
List of unnumbered trans-Neptunian objects: 2004
*
List of unnumbered trans-Neptunian objects: 2005
*
List of unnumbered trans-Neptunian objects: 2006
*
List of unnumbered trans-Neptunian objects: 2007
2008
2009–2016
*
List of unnumbered trans-Neptunian objects: 2009
*
List of unnumbered trans-Neptunian objects: 2010
*
List of unnumbered trans-Neptunian objects: 2011
*
List of unnumbered trans-Neptunian objects: 2012
*
List of unnumbered trans-Neptunian objects: 2013
*
List of unnumbered trans-Neptunian objects: 2014
*
List of unnumbered trans-Neptunian objects: 2015
*
List of unnumbered trans-Neptunian objects: 2016
2017
2018
2019
2020
2021
2022
Ignored objects
The Minor Planet Center does not include the following 111 objects with a semi-major axis larger than that of Neptune in its respective lists ''(see )''.
The data is sourced from the ''List of Known Trans-Neptunian Objects'' at Johnston's Archive.
See also
*
List of unnumbered minor planets
*
List of the brightest Kuiper belt objects
Since the year 2000, a number of Kuiper belt objects (KBOs) with diameters of between 500 and 1500 km (more than half that of Pluto) have been discovered. 50000 Quaoar, a classical KBO discovered in 2002, is over 1000 km across. and , ...
*
List of Solar System objects by greatest aphelion
This is a list of Solar System objects by greatest aphelion or the greatest distance from the Sun that the orbit could take it if the Sun and object were the only objects in the universe. It is implied that the object is orbiting the Sun in a t ...
*
List of Solar System objects most distant from the Sun
These Solar System minor planets are the furthest from the Sun . The objects have been categorized by their approximate current distance from the Sun, and not by the calculated aphelion of their orbit. The list changes over time because the ob ...
Notes
References
External links
How many dwarf planets are there in the outer solar system? ''
Michael Brown'', Caltech
OSSOS TNODBby the ''
Outer Solar System Origins Survey
The Outer Solar System Origins Survey (OSSOS) is an astronomical survey and observing program aimed at discovering and tracking trans-Neptunian objects located in the outermost regions of the Solar System beyond the orbit of Neptune. OSSOS is d ...
''
Known extreme outer solar system objects Scott Sheppard, ''
Carnegie Science Center
The Carnegie Science Center is one of the four Carnegie Museums of Pittsburgh, Pennsylvania. It is located in the Chateau neighborhood. It is located across the street from Heinz Field.
Overview
The Carnegie Science Center is the most visited mu ...
''
{{DEFAULTSORT:List Of Unnumbered Trans-Neptunian Objects
Lists of trans-Neptunian objects
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