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List of unnumbered trans-Neptunian objects
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This is a list of unnumbered trans-Neptunian objects (TNOs) first observed since 1993 and grouped by the year of principal provisional designation. The data is sourced from the Minor Planet Center's (MPC) List of Trans Neptunian Objects, List Of Centaurs and Scattered-Disk Objects, and Database Search.[2][3][4] 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. As of October 2025[update], there are 4,512 unnumbered objects, defined here as minor planets with a semi-major axis larger than 30.1 AU (Neptune's average orbital distance from the Sun).
![]() | This article needs to be updated. (July 2024) |
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, spectral taxonomy and B–R color index.[1] Members of the extreme trans-Neptunian objects (ESDOs, EDDOs and sednoids) – with a semi-major axis greater than 150 AU and perihelion greater than 30 AU – are also identified.
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Statistics
250
500
750
1,000
1,250
1,500
'92
'94
'96
'98
'00
'02
'04
'06
'08
'10
'12
'14
'16
'18
'20
'22
'24
- Numbered TNOs: 1,030 obj. (18.6%)
- Unnumbered TNOs: 4,512 obj. (81.4%)
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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
2009–2018
- 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
- List of unnumbered trans-Neptunian objects: 2017
- List of unnumbered trans-Neptunian objects: 2018
2019
2020
2021
2022
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2023
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2024
2025
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See also
References
External links
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