List of unnumbered trans-Neptunian objects

Last updated

Ecc wo c.png
TNOs: a vs. e (semi-log plot, 30–1000 AU): [1]

  Resonant plutinos (39  AU) and twotinos (48 AU)   Inner and outer classical objects (< 39 and > 49 AU)  Other resonant objects besides plutinos and twotinos   Classical Kuiper belt objects (cubewanos)   Scattered disc objects (SDO)  Other TNOs (dots) and centaurs (asterisk)   Sednoids, prominent ETNOs

Contents

Circle frame.svgplutinos (3∶2 res.): 438 objects (12.3%)Haumeids: 12 objects (0.3%)twotinos (2∶1 res.): 107 objects (3.0%)other resonances: 377 objects (10.6%)cold classical: 716 objects (20.1%)hot classical: 257 objects (7.2%)SDOs: 565 objects (15.9%)sednoids: 4 objects (0.1%)ESDOs: 10 objects (0.3%)EDDOs: 10 objects (0.3%)damocloids: 71 objects (2.0%)centaurs: 211 objects (5.9%)unclassified TNOs: 782 objects (22.0%)
Distribution of 3,590 listed TNO objects (with a > 30.1 AU, including candidates) by subclass from Johnston's Archive (hover) [1]

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, 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).

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.

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
TNOs by year of principle designation since 1992 (objects with a < 30.1 AU excluded). As of October 2025, there are    4,512 unnumbered TNOs and    1,030 numbered TNOs (Pluto from 1930 is not shown) [2] [3] [4]
Circle frame.svgNumbered TNOs: 1,030 obj. (18.6%)Unnumbered TNOs: 4,512 obj. (81.4%)
  •   Numbered TNOs: 1,030 obj. (18.6%)
  •   Unnumbered TNOs: 4,512 obj. (81.4%)
Split-up of numbered and unnumbered trans-Neptunian objects [2] [3] [4]

List

1993

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1993 RP 15 September 1993 Mauna Kea Obs. ( 568 )50 res  · 4:5 35.10.06433.237.0— MPC  · JPL

1994

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1994 ES213 March 1994 J. X. Luu
D. C. Jewitt ( 568 )		102 cubewano (cold)45.60.11140.450.8BR-mag: 1.65 MPC  · JPL
1994 TG3 October 1994 Mauna Kea Obs. (568)187cubewano (hot)42.30.00742.342.3— MPC  · JPL
1994 TG28 October 1994 La Silla Obs. ( 809 )135cubewano?42.40.00242.442.4— MPC  · JPL
1994 TH3 October 1994 Mauna Kea Obs. ( 568 )146other TNO40.90.001640.940.9— MPC  · JPL

1995

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1995 DB224 February 1995 D. C. Jewitt
J. X. Luu ( 568 )		102 cubewano (cold)46.20.13440.152.2— MPC  · JPL
1995 FB2129 March 1995Siding Spring Observatory ( 413 )107cubewano?42.40.00142.442.4— MPC  · JPL
1995 GA73 April 1995 Mauna Kea Obs. ( 568 )153 plutino?39.50.12434.844.2— MPC  · JPL
1995 GJ 3 April 1995Mauna Kea Obs. (568)187other TNO42.90.092339.046.8— MPC  · JPL
1995 GY76 April 1995 La Silla Obs. ( 809 )107 cubewano?41.30.00141.341.3— MPC  · JPL
1995 KJ130 May 1995 Mauna Kea Obs. ( 568 )170cubewano?43.50.00343.543.5— MPC  · JPL
1995 KK130 May 1995Mauna Kea Obs. (568)97 plutino?39.50.19932.047.0— MPC  · JPL
1995 YY324 December 1995Mauna Kea Obs. (568)97other TNO39.20.22030.647.7— MPC  · JPL

1996

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1996 AS2014 January 1996 Spacewatch ( 691 )76 centaur 35.80.621113.658.0— MPC  · JPL
1996 KV121 May 1996 C. Trujillo
D. C. Jewitt
J. X. Luu ( 568 )		163 cubewano (hot)45.50.12840.250.9— MPC  · JPL
1996 KX122 May 1996 Mauna Kea Obs. (568)97 plutino?39.50.10235.743.4— MPC  · JPL
1996 KY116 May 1996Mauna Kea Obs. (568)122plutino?39.50.103135.743.3— MPC  · JPL
1996 PW 9 August 1996 Haleakala-NEAT/GEODSS ( 566 )10 damocloid 269.670.930.092.4536.8— MPC  · JPL
1996 RQ206 September 1996 D. L. Rabinowitz ( 675 )196other TNO44.00.103239.448.7BR-mag: 1.56; taxonomy: IR MPC  · JPL

1997

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1997 CW298 February 1997 Mauna Kea Obs. ( 568 )243 plutino?39.40.081936.342.5— MPC  · JPL
1997 GA453 April 1997 B. Gladman (568)89 cubewano (hot)47.00.17838.955.0— MPC  · JPL
1997 QH427 August 1997 D. C. Jewitt
C. Trujillo
J. X. Luu
K. Berney (568)		187cubewano (hot)43.00.091339.246.7BR-mag: 1.68; taxonomy: RR MPC  · JPL
1997 RL135 September 1997 Palomar Obs. ( 675 )59cubewano?44.50.00644.544.5— MPC  · JPL
1997 RX97 September 1997 B. Gladman (675)103other TNO41.80.053039.744.0— MPC  · JPL
1997 RY66 September 1997 La Palma Obs. ( 950 )149 cubewano (hot)41.40.001241.441.4— MPC  · JPL
1997 TX85 October 1997 Palomar Obs. ( 675 )97 plutino?39.30.19932.046.6— MPC  · JPL
1997 UG2526 October 1997 La Palma Obs. ( 950 )68 cubewano?43.30.00143.343.3— MPC  · JPL

1998

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
1998 FS14423 March 1998Northfield Mount Hermon School ( 807 )212 cubewano (hot)41.60.021040.642.5BR-mag: 1.53; taxonomy: IR MPC  · JPL
1998 HL15129 April 1998 D. C. Jewitt
J. X. Luu
C. Trujillo
D. J. Tholen ( 568 )		88other TNO40.70.092837.244.3BR-mag: 1.06 MPC  · JPL
1998 HN15121 April 1998J. Kormendy
R. Wainscoat
D. J. Tholen
D. C. Jewitt (568)		80other TNO37.90.062535.840.0— MPC  · JPL
1998 HO15122 April 1998R. Wainscoat
J. Kormendy
D. C. Jewitt
J. X. Luu (568)		108other TNO41.30.101737.345.2— MPC  · JPL
1998 HR15128 April 1998 Mauna Kea Obs. (568)89 cubewano?45.50.12739.951.1— MPC  · JPL
1998 KD6629 May 1998 Cerro Tololo Obs. ( 807 )79cubewano?43.10.05540.945.3— MPC  · JPL
1998 KE6629 May 1998Cerro Tololo Obs. (807)54cubewano?42.10.00342.142.1— MPC  · JPL
1998 KF6629 May 1998Cerro Tololo Obs. (807)53 plutino?39.50.21631.147.9— MPC  · JPL
1998 KG6629 May 1998Cerro Tololo Obs. (807)56 cubewano?45.20.00445.245.2— MPC  · JPL
1998 KS6529 May 1998 G. Bernstein (807)100cubewano (cold)44.20.04142.346.0BR-mag: 1.73; taxonomy: RR-IR MPC  · JPL
1998 KY6129 May 1998G. Bernstein (807)118cubewano (cold)44.70.04243.046.5— MPC  · JPL
1998 UR4322 October 1998 M. W. Buie ( 695 )106 plutino 39.40.22930.848.1BR-mag: 1.27; taxonomy: BR MPC  · JPL
1998 WS3118 November 1998M. W. Buie (695)108plutino39.40.20731.447.3BR-mag: 1.32; taxonomy: IR-BR MPC  · JPL
1998 WV2418 November 1998M. W. Buie (695)85other TNO39.00.04237.440.6BR-mag: 1.27; taxonomy: BR; binary: 91 km MPC  · JPL
1998 WV3119 November 1998M. W. Buie (695)153 plutino 39.30.27628.650.1BR-mag: 1.31; taxonomy: BR MPC  · JPL
1998 WW31 18 November 1998M. W. Buie (695)148 cubewano (hot)44.70.09740.748.6albedo: 0.054; binary: 123 km MPC  · JPL
1998 WX2418 November 1998M. W. Buie (695)155cubewano (cold)43.30.04141.545.1BR-mag: 1.79; taxonomy: RR MPC  · JPL
1998 WY3118 November 1998M. W. Buie (695)136cubewano (cold)45.00.11239.950.2— MPC  · JPL
1998 WZ2418 November 1998 Kitt Peak Obs. (695)116 plutino?39.50.18532.446.6— MPC  · JPL
1998 WZ3119 November 1998 M. W. Buie (695)116plutino39.40.171532.846.1BR-mag: 1.26; taxonomy: BB-BR MPC  · JPL

1999–2007

2008

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2008 AP1186 January 2008 Mauna Kea Obs. ( 568 )95 cubewano?43.80.15036.950.7— MPC  · JPL
2008 AU1388 January 2008 Mauna Kea Obs. (568)251 centaur 32.40.374220.344.4— MPC  · JPL
2008 JO4111 May 2008Mauna Kea Obs. (568)78 SDO 86.70.544839.8133— MPC  · JPL
2008 LD187 June 2008Mauna Kea Obs. (568)80other TNO40.20.301427.952.4— MPC  · JPL
2008 TA2397 October 2008D. J. Tholen (T14)143 plutino 39.70.103235.743.8— MPC  · JPL
2008 UA33226 October 2008 L. H. Wasserman ( 807 )218 res  · 1:4 76.50.513037.0116— MPC  · JPL

2009–2018


2019

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2019 AC7711 January 2019 Cerro Tololo Obs. ( 807 )181 SDO 57.10.381235.378.9— MPC  · JPL
2019 EA56 March 2019Cerro Tololo Obs. (807)171SDO69.80.452838.2101— MPC  · JPL
2019 EB54 March 2019Cerro Tololo Obs. (807)155SDO52.30.32835.668.9— MPC  · JPL
2019 ET55 March 2019 Mauna Kea Obs. ( 568 )187SDO52.40.261238.966.0— MPC  · JPL
2019 EU5 6 January 2016Mauna Kea Obs. (568)198 EDDO 9730.951846.71900 ETNO MPC  · JPL
2019 EV55 March 2019Mauna Kea Obs. (568)117 SDO 55.70.43931.779.8— MPC  · JPL
2019 GJ235 April 2019 Korea Microlensing Telescope Network-CTIO ( W93 )130 cubewano (cold)43.70.08140.447.0— MPC  · JPL
2019 GZ1294 April 2019 Cerro Tololo Obs. ( 807 )146 SDO 61.80.36939.384.3— MPC  · JPL
2019 QQ828 August 2019 Pan-STARRS ( F51 )10 centaur 61.80.89246.8117— MPC  · JPL
2019 RO44 September 2019 Lowell Discovery Tel. ( G37 )164other TNO42.00.172034.749.3— MPC  · JPL
2019 SJ18726 September 2019 Cerro Tololo Obs. ( 807 )192 SDO 74.50.502136.9112— MPC  · JPL
2019 SS14924 September 2019Cerro Tololo Obs. (807)213SDO1190.701535.4203— MPC  · JPL
2019 TX77 October 2019 Pan-STARRS ( F51 )10 centaur 33.20.8056.659.9— MPC  · JPL
2019 UH1227 October 2019 Pan-STARRS 2 ( F52 )40centaur52.90.85477.998.0— MPC  · JPL

2020

2021

2022

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2022 FA712 April 2021 Korea Microlensing Telescope Network-CTIO ( W93 )202other TNO44.00.311530.557.5— MPC  · JPL
2022 FR61 March 2020Korea Microlensing Telescope Network-CTIO (W93)112 cubewano?44.10.08740.847.5— MPC  · JPL
2022 GP412 April 2021Korea Microlensing Telescope Network-CTIO (W93)81 cubewano?43.60.121038.548.8— MPC  · JPL
2022 GY316 April 2021Korea Microlensing Telescope Network-CTIO (W93)114 cubewano?42.70.14236.748.6— MPC  · JPL
2022 GZ316 April 2021Korea Microlensing Telescope Network-CTIO (W93)105 cubewano?41.60.071638.544.8— MPC  · JPL

2023

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2023 DP519 February 2023 Mount Lemmon Survey ( G96 ) damocloid 93.370.95118.44.8181.94— MPC  · JPL
2023 KQ14 Subaru Telescope sednoid 2520.7381166 [5]

2024

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2024 AW15— MPC  · JPL
2024 CC30— MPC  · JPL
2024 DJ4— MPC  · JPL
2024 EL7— MPC  · JPL
2024 FA27— MPC  · JPL
2024 FB27— MPC  · JPL
2024 FV24— MPC  · JPL
2024 FX26— MPC  · JPL
2024 FY26— MPC  · JPL
2024 FZ26— MPC  · JPL
2024 GF30— MPC  · JPL
2024 GG30— MPC  · JPL
2024 GT4— MPC  · JPL
2024 JD27— MPC  · JPL
2024 JL23— MPC  · JPL
2024 LY9— MPC  · JPL
2024 OR4— MPC  · JPL
2024 PL17— MPC  · JPL
2024 PP38— MPC  · JPL
2024 PP8— MPC  · JPL
2024 QX1— MPC  · JPL
2024 RA22— MPC  · JPL
2024 RQ11— MPC  · JPL
2024 TF3— MPC  · JPL
2024 XN25— MPC  · JPL
2024 XS15— MPC  · JPL

2025

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2025 BD4— MPC  · JPL
2025 BU10— MPC  · JPL
2025 DB51— MPC  · JPL
2025 DZ48— MPC  · JPL
2025 FU12— MPC  · JPL
2025 FX19— MPC  · JPL
2025 GG— MPC  · JPL
2025 ML58— MPC  · JPL
2025 MM66— MPC  · JPL
2025 MP35— MPC  · JPL
2025 MV13— MPC  · JPL
2025 MW47— MPC  · JPL
2025 OO1— MPC  · JPL
2025 PA2— MPC  · JPL
2025 QY2— MPC  · JPL
2025 RY11— MPC  · JPL

See also

References

  1. 1 2 3 "List of Known Trans-Neptunian Objects". Johnston's Archive. 2 January 2022. Retrieved 16 April 2022.
  2. 1 2 3 "List Of Transneptunian Objects". Minor Planet Center. 16 April 2022.
  3. 1 2 3 "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. 16 April 2022.
  4. 1 2 3 "MPC Database Search: a ≥ 30.1 AU". Minor Planet Center. Archived from the original on 2 October 2025. Retrieved 2 October 2025. 5542 trans-Neptunian objects
  5. ↑ Chen, Ying-Tung; Lykawka, Patryk Sofia; Huang, Yukun; Kavelaars, J. J.; Fraser, Wesley C.; Bannister, Michele T.; Wang, Shiang-Yu; Chang, Chan-Kao; Lehner, Matthew J.; Yoshida, Fumi; Gladman, Brett; Alexandersen, Mike; Ashton, Edward; Choi, Young-Jun; Granados Contreras, A. Paula (14 July 2025). "Discovery and dynamics of a Sedna-like object with a perihelion of 66 au". Nature Astronomy: 1–8. arXiv: 2508.02162 . doi: 10.1038/s41550-025-02595-7 . ISSN   2397-3366.
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