List of unnumbered trans-Neptunian objects

From Wikipedia, the free encyclopedia

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, List Of Other Unusual Objects, and Database Search.[2][3][4][5] 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 April 2026, there are 4,977 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).

Quick facts
Full region – by eccentricity
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

cold classical: 1,226 objects (23.0%)hot classical: 1,119 objects (20.9%)SDOs: 770 objects (14.4%)plutinos (3∶2 res.): 577 objects (10.8%)other resonances: 504 objects (9.4%)centaurs: 314 objects (5.9%)twotinos (2∶1 res.): 142 objects (2.7%)damocloids: 85 objects (1.6%)neptune trojans: 28 objects (0.5%)EDDOs: 15 objects (0.3%)ESDOs: 13 objects (0.2%)haumeids: 12 objects (0.2%)unusual: 6 objects (0.1%)sednoids: 3 objects (0.1%)amors: 3 objects (0.1%)unclassified TNOs: 525 objects (9.8%)
Distribution of 5,342 listed TNO objects (with a > 30.1 AU) by subclass from Johnston's Archive (hover)[1]
Close

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
'26
TNOs by year of principle designation since 1992 (objects with a < 30.1 AU excluded). As of April 2026, there are    4,977 unnumbered TNOs and    1,044 numbered TNOs (Pluto from 1930 is not shown)[2][3][4][5]
Numbered TNOs: 1,044 obj. (17.3%)Unnumbered TNOs: 4,977 obj. (82.7%)
  •   Numbered TNOs: 1,044 obj. (17.3%)
  •   Unnumbered TNOs: 4,977 obj. (82.7%)
Split-up of numbered and unnumbered trans-Neptunian objects[2][3][4][5]

List

1993

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1993 RP15 September 1993Mauna Kea Obs. (568)50res · 4:535.30.06433.137.5MPC · JPL
Close

1994

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1994 ES213 March 1994J. X. Luu
D. C. Jewitt (568)
83cubewano (cold)45.80.11140.650.9MPC · JPL
1994 TG3 October 1994Mauna Kea Obs. (568)188cubewano (hot)?42.30742.342.3MPC · JPL
1994 TG28 October 1994La Silla Obs. (809)136cubewano (cold)?42.40242.442.4MPC · JPL
1994 TH3 October 1994Mauna Kea Obs. (568)147other TNO40.901640.940.9MPC · JPL
Close

1995

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1995 DB224 February 1995D. C. Jewitt
J. X. Luu (568)
96cubewano (cold)46.50.14440.153MPC · JPL
1995 FB2129 March 1995Siding Spring Obs. (413)108cubewano (cold)?42.40142.442.4MPC · JPL
1995 GA73 April 1995Mauna Kea Obs. (568)154plutino?39.50.12434.844.2MPC · JPL
1995 GJ3 April 1995Mauna Kea Obs. (568)188cubewano (hot)?42.90.09233946.8MPC · JPL
1995 GY76 April 1995La Silla Obs. (809)108cubewano (cold)?41.30141.341.3MPC · JPL
1995 KJ130 May 1995Mauna Kea Obs. (568)171cubewano (cold)?43.50343.543.5MPC · JPL
1995 KK130 May 1995Mauna Kea Obs. (568)97plutino?39.50.1993247MPC · JPL
1995 YY324 December 1995Mauna Kea Obs. (568)97plutino?39.60.22030.848.4MPC · JPL
Close

1996

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1996 AS2014 January 1996Spacewatch (691)76centaur35.80.621113.658MPC · JPL
1996 KV121 May 1996C. Trujillo
D. C. Jewitt
J. X. Luu (568)
164cubewano (hot)450.11840.249.9MPC · JPL
1996 KX122 May 1996Mauna Kea Obs. (568)97plutino?39.50.1235.743.4MPC · JPL
1996 KY116 May 1996Mauna Kea Obs. (568)123plutino?39.50.13135.743.3MPC · JPL
1996 PW9 August 1996Haleakala-NEAT/GEODSS (566)10damocloid272.40.99302.6542.2MPC · JPL
1996 RQ206 September 1996D. L. Rabinowitz (675)197cubewano (hot)44.10.13239.648.7MPC · JPL
Close

1997

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1997 CW298 February 1997Mauna Kea Obs. (568)245plutino?39.40.081936.342.5MPC · JPL
1997 GA453 April 1997B. Gladman (568)90cubewano (hot)?47.10.18838.855.4MPC · JPL
1997 QH427 August 1997D. C. Jewitt
C. Trujillo
K. Berney (568)
188cubewano (hot)42.90.091339.146.7MPC · JPL
1997 RL135 September 1997Palomar Obs. (675)60cubewano (hot)?44.50644.544.5MPC · JPL
1997 RX97 September 1997B. Gladman (675)103cubewano (hot)41.70.053039.643.8MPC · JPL
1997 RY66 September 1997La Palma Obs. (950)150cubewano (hot)?41.401241.441.4MPC · JPL
1997 TX85 October 1997Palomar Obs. (675)97plutino?39.30.1993246.6MPC · JPL
1997 UG2526 October 1997La Palma Obs. (950)68cubewano (cold)?43.30143.343.3MPC · JPL
Close

1998

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
1998 FS14423 March 1998 Northfield Mount Hermon School (807)213cubewano (hot)41.70.021040.742.7MPC · JPL
1998 HL15129 April 1998D. C. Jewitt
J. X. Luu
C. Trujillo
D. J. Tholen (568)
88other TNO40.60.092836.944.3MPC · JPL
1998 HN15121 April 1998J. Kormendy
R. Wainscoat
D. J. Tholen
D. C. Jewitt (568)
83other TNO37.90.052535.939.8MPC · JPL
1998 HO15122 April 1998R. Wainscoat
J. Kormendy
D. C. Jewitt
J. X. Luu (568)
108cubewano (hot)41.30.091737.545.1MPC · JPL
1998 HR15128 April 1998Mauna Kea Obs. (568)90cubewano (hot)?45.50.12739.951.1MPC · JPL
1998 KD6629 May 1998Cerro Tololo Obs. (807)78cubewano (hot)?43.10.05540.945.3MPC · JPL
1998 KE6629 May 1998Cerro Tololo Obs. (807)54cubewano (cold)?42.10342.142.1MPC · JPL
1998 KF6629 May 1998Cerro Tololo Obs. (807)54plutino?39.50.21631.147.9MPC · JPL
1998 KG6629 May 1998Cerro Tololo Obs. (807)57cubewano (cold)?45.20445.245.2MPC · JPL
1998 KS6529 May 1998G. Bernstein (807)101cubewano (cold)43.70.03142.345.2MPC · JPL
1998 KY6129 May 1998G. Bernstein (807)119cubewano (cold)44.30.05242.146.5MPC · JPL
1998 UR4322 October 1998M. W. Buie (695)107plutino39.80.23930.848.9MPC · JPL
1998 WS3118 November 1998M. W. Buie (695)109plutino39.70.21731.547.9MPC · JPL
1998 WV2418 November 1998M. W. Buie (695)122plutino?39.20.04237.840.7MPC · JPL
1998 WV3119 November 1998M. W. Buie (695)118plutino39.50.27628.950.2MPC · JPL
1998 WW3118 November 1998M. W. Buie (695)145cubewano (hot)44.90.08741.348.5MPC · JPL
1998 WX2418 November 1998M. W. Buie (695)156cubewano (cold)43.60.0414245.2MPC · JPL
1998 WY3118 November 1998M. W. Buie (695)137cubewano (cold)45.50.1224051MPC · JPL
1998 WZ2418 November 1998Kitt Peak Obs. (695)117plutino?39.50.18532.446.6MPC · JPL
1998 WZ3119 November 1998M. W. Buie (695)111plutino39.80.17153346.6MPC · JPL
Close

1999–2007

2008

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
2008 AP1186 January 2008P. A. Wiegert (568)121res · 4:743.90.1613750.8MPC · JPL
2008 AU1388 January 2008Mauna Kea Obs. (568)256centaur32.50.374320.444.5MPC · JPL
2008 BN1830 January 2008Spacewatch (291)11damocloid35.20.93292.667.8MPC · JPL
2008 JO4111 May 2008Mauna Kea Obs. (568)79SDO86.70.544939.9133.4MPC · JPL
2008 LD187 June 2008Mauna Kea Obs. (568)81other TNO40.20.31152852.5MPC · JPL
2008 QQ53MPC · JPL
2008 TA2397 October 2008D. J. Tholen (T14)144plutino39.70.13235.743.8MPC · JPL
2008 UA33226 October 2008L. H. Wasserman (807)219res · 1:476.40.513137.1115.6MPC · JPL
Close

2009–2023

2024

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
2024 AW1510 January 2024 WFST (O18)164plutino39.70.3427.951.5MPC · JPL
2024 CC307 February 2024Cerro Tololo-DECam (W84)58.40.18452.664.2MPC · JPL
2024 CE307 February 2024Cerro Tololo-DECam (W84)37.30.12633.740.9MPC · JPL
2024 DJ418 February 2024Pan-STARRS 1 (F51)4unusual38.70.92253.274.3MPC · JPL
2024 EL74 March 2024KMTNet-CTIO (W93)160cubewano (cold)?430.1138.747.4MPC · JPL
2024 FA2716 March 2024Cerro Tololo-DECam (W84)88.50.8917.8159.1MPC · JPL
2024 FB2716 March 2024Cerro Tololo-DECam (W84)38.40.11234.142.7MPC · JPL
2024 FV2419 March 2024Pan-STARRS 1 (F51)7SDO61.70.89316.6116.8MPC · JPL
2024 FX2616 March 2024Cerro Tololo-DECam (W84)251.20.841640.9461.5MPC · JPL
2024 FY2616 March 2024Cerro Tololo-DECam (W84)80.60.59632.9128.3MPC · JPL
2024 FZ2616 March 2024Cerro Tololo-DECam (W84)48.20.29834.461.9MPC · JPL
2024 GF303 April 2024Cerro Tololo-DECam (W84)42.50.163735.649.3MPC · JPL
2024 GG303 April 2024Cerro Tololo-DECam (W84)46.90.413127.966MPC · JPL
2024 GT44 April 2024ATLAS–SAAO (M22)146centaur33.40.543515.451.4MPC · JPL
2024 JD272 May 2024Pan-STARRS 1 (F51)3damocloid41.40.93583.179.8MPC · JPL
2024 JL237 May 2024Pan-STARRS 2 (F52)19SDO76.50.852211.5141.4MPC · JPL
2024 LY915 June 2024Pan-STARRS 2 (F52)24SDO60.20.841469.7110.7MPC · JPL
2024 OR430 July 2024Purple Mountain Observatory, XuYi Station (D29)102centaur35.80.521917.254.4MPC · JPL
2024 PL1715 August 2024Pan-STARRS 1 (F51)24SDO87.40.931426.6168.2MPC · JPL
2024 PP383 August 2024Pan-STARRS 1 (F51)187.30.971536.3368.4MPC · JPL
2024 PP815 August 2024Calar Alto-Schmidt (Z84)4damocloid92.40.971362.9181.9MPC · JPL
2024 QX127 August 2024Pan-STARRS 1 (F51)4damocloid255.80.991443.1508.5MPC · JPL
2024 RA2211 September 2024Pan-STARRS 2 (F52)92centaur53.60.642619.487.8MPC · JPL
2024 RQ111 September 2024Pan-STARRS 2 (F52)2.3damocloid58.20.951332.7113.7MPC · JPL
2024 TF33 October 2024Pan-STARRS 2 (F52)42centaur47.90.778910.984.8MPC · JPL
2024 XN258 December 2024Pan-STARRS 2 (F52)2.7damocloid55.40.95982.7108.1MPC · JPL
2024 XS152 December 2024Kitt Peak Obs.-Bok (V00)4centaur48.10.89295.391MPC · JPL
Close

2025

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
2025 BD419 January 2025Pan-STARRS 1 (F51)52centaur73.10.841011.7134.4MPC · JPL
2025 BU1027 January 2025Mt. Lemmon Survey (G96)14centaur78.10.91547.3149MPC · JPL
2025 DB5125 February 2025Kitt Peak Obs.-Bok (V00)48centaur500.60.9710513.7987.6MPC · JPL
2025 DZ4824 February 2025Mt. Lemmon Survey (G96)19centaur33.90.81636.461.4MPC · JPL
2025 FU1222 March 2025Pan-STARRS 2 (F52)30centaur42.90.7915976.9MPC · JPL
2025 FX1930 March 2025Pan-STARRS 1 (F51)75centaur38.70.664113.364.2MPC · JPL
2025 GG2 April 2025Pan-STARRS 1 (F51)54centaur540.812210.497.6MPC · JPL
2025 LS22025Simonyi Survey Telescope Rubin Obs.538.60.921343.01034MPC · JPL
2025 ML5822 April 2025Simonyi Survey Telescope Rubin Obs. (X05)51.10.41630.771.5MPC · JPL
2025 MM662 May 2025Simonyi Survey Telescope Rubin Obs. (X05)47.50.23936.858.2MPC · JPL
2025 MP3522 April 2025Simonyi Survey Telescope Rubin Obs. (X05)46.10.191037.354.9MPC · JPL
2025 MV132 May 2025Simonyi Survey Telescope Rubin Obs. (X05)39.20.252229.648.9MPC · JPL
2025 MW4728 April 2025Simonyi Survey Telescope Rubin Obs. (X05)39.10.32726.851.5MPC · JPL
2025 MX3482025Simonyi Survey Telescope Rubin Obs. (X05)514.90.971.817.81012MPC · JPL
2025 MZ34830 June 202547.70.241136.159.2MPC · JPL
2025 OO122 July 2025Pan-STARRS 2 (F52)52.70.262038.966.6MPC · JPL
2025 PA215 August 2025Pan-STARRS 2 (F52)42.80.2934.251.4MPC · JPL
2025 QY216 August 2025WFST (O18)54.40.491027.581.2MPC · JPL
2025 RY1115 September 2025Pan-STARRS 2 (F52)34.90.82176.463.3MPC · JPL
2025 TS1312 October 2025WFST (O18)47.10.9495391.3MPC · JPL
2025 TT131 October 2025Kitt Peak Obs.-Bok (V00)39.30.921533.275.4MPC · JPL
2025 VR3314 November 2025Magellan-Baade Telescope800.501840121MPC · JPL
Close

2026

More information Designation, First Observed (discovered) ...
Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site)
Class a
(AU)
e i
(°)
q
(AU)
Q
(AU)
2026 AZ17MPC · JPL
2026 BK13MPC · JPL
Close

See also

References

Related Articles

Wikiwand AI