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.svgcold 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]

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 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] [5]
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] [5]

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 35.30.06433.137.5— 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 )		83 cubewano (cold)45.80.11140.650.9— MPC  · JPL
1994 TG3 October 1994 Mauna Kea Obs. (568)188cubewano (hot)?42.30742.342.3— MPC  · JPL
1994 TG28 October 1994 La Silla Obs. ( 809 )136cubewano (cold)?42.40242.442.4— MPC  · JPL
1994 TH3 October 1994 Mauna Kea Obs. ( 568 )147other TNO40.901640.940.9— 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 )		96 cubewano (cold)46.50.14440.153— MPC  · JPL
1995 FB2129 March 1995 Siding Spring Obs. ( 413 )108cubewano (cold)?42.40142.442.4— MPC  · JPL
1995 GA73 April 1995 Mauna Kea Obs. ( 568 )154 plutino?39.50.12434.844.2— MPC  · JPL
1995 GJ 3 April 1995Mauna Kea Obs. (568)188 cubewano (hot)?42.90.09233946.8— MPC  · JPL
1995 GY76 April 1995 La Silla Obs. ( 809 )108cubewano (cold)?41.30141.341.3— MPC  · JPL
1995 KJ130 May 1995 Mauna Kea Obs. ( 568 )171cubewano (cold)?43.50343.543.5— MPC  · JPL
1995 KK130 May 1995Mauna Kea Obs. (568)97 plutino?39.50.1993247— MPC  · JPL
1995 YY324 December 1995Mauna Kea Obs. (568)97plutino?39.60.22030.848.4— 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— MPC  · JPL
1996 KV121 May 1996 C. Trujillo
D. C. Jewitt
J. X. Luu ( 568 )		164 cubewano (hot)450.11840.249.9— MPC  · JPL
1996 KX122 May 1996 Mauna Kea Obs. ( 568 )97 plutino?39.50.1235.743.4— MPC  · JPL
1996 KY116 May 1996Mauna Kea Obs. (568)123plutino?39.50.13135.743.3— MPC  · JPL
1996 PW 9 August 1996 Haleakala-NEAT/GEODSS ( 566 )10 damocloid 272.40.99302.6542.2— MPC  · JPL
1996 RQ206 September 1996 D. L. Rabinowitz ( 675 )197 cubewano (hot)44.10.13239.648.7— 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 )245 plutino?39.40.081936.342.5— MPC  · JPL
1997 GA453 April 1997 B. Gladman (568)90 cubewano (hot)?47.10.18838.855.4— MPC  · JPL
1997 QH427 August 1997 D. C. Jewitt
C. Trujillo
K. Berney (568)		188cubewano (hot)42.90.091339.146.7— MPC  · JPL
1997 RL135 September 1997 Palomar Obs. ( 675 )60cubewano (hot)?44.50644.544.5— MPC  · JPL
1997 RX97 September 1997 B. Gladman (675)103cubewano (hot)41.70.053039.643.8— MPC  · JPL
1997 RY66 September 1997 La Palma Obs. ( 950 )150cubewano (hot)?41.401241.441.4— MPC  · JPL
1997 TX85 October 1997 Palomar Obs. ( 675 )97 plutino?39.30.1993246.6— MPC  · JPL
1997 UG2526 October 1997 La Palma Obs. ( 950 )68 cubewano (cold)?43.30143.343.3— 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 1998 Northfield Mount Hermon School ( 807 )213 cubewano (hot)41.70.021040.742.7— MPC  · JPL
1998 HL15129 April 1998 D. C. Jewitt
J. X. Luu
C. Trujillo
D. J. Tholen ( 568 )		88other TNO40.60.092836.944.3— MPC  · JPL
1998 HN15121 April 1998 J. Kormendy
R. Wainscoat
D. J. Tholen
D. C. Jewitt ( 568 )		83other TNO37.90.052535.939.8— MPC  · JPL
1998 HO15122 April 1998R. Wainscoat
J. Kormendy
D. C. Jewitt
J. X. Luu (568)		108 cubewano (hot)41.30.091737.545.1— MPC  · JPL
1998 HR15128 April 1998 Mauna Kea Obs. (568)90cubewano (hot)?45.50.12739.951.1— MPC  · JPL
1998 KD6629 May 1998 Cerro Tololo Obs. ( 807 )78cubewano (hot)?43.10.05540.945.3— MPC  · JPL
1998 KE6629 May 1998Cerro Tololo Obs. (807)54cubewano (cold)?42.10342.142.1— MPC  · JPL
1998 KF6629 May 1998Cerro Tololo Obs. (807)54 plutino?39.50.21631.147.9— MPC  · JPL
1998 KG6629 May 1998Cerro Tololo Obs. (807)57 cubewano (cold)?45.20445.245.2— MPC  · JPL
1998 KS6529 May 1998 G. Bernstein (807)101cubewano (cold)43.70.03142.345.2— MPC  · JPL
1998 KY6129 May 1998G. Bernstein (807)119cubewano (cold)44.30.05242.146.5— MPC  · JPL
1998 UR4322 October 1998 M. W. Buie ( 695 )107 plutino 39.80.23930.848.9— MPC  · JPL
1998 WS3118 November 1998M. W. Buie (695)109plutino39.70.21731.547.9— MPC  · JPL
1998 WV2418 November 1998M. W. Buie (695)122plutino?39.20.04237.840.7— MPC  · JPL
1998 WV3119 November 1998M. W. Buie (695)118plutino39.50.27628.950.2— MPC  · JPL
1998 WW31 18 November 1998M. W. Buie (695)145 cubewano (hot)44.90.08741.348.5— MPC  · JPL
1998 WX2418 November 1998M. W. Buie (695)156cubewano (cold)43.60.0414245.2— MPC  · JPL
1998 WY3118 November 1998M. W. Buie (695)137cubewano (cold)45.50.1224051— MPC  · JPL
1998 WZ2418 November 1998 Kitt Peak Obs. (695)117 plutino?39.50.18532.446.6— MPC  · JPL
1998 WZ3119 November 1998 M. W. Buie (695)111plutino39.80.17153346.6— 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 P. A. Wiegert ( 568 )121 res  · 4:7 43.90.1613750.8— MPC  · JPL
2008 AU1388 January 2008 Mauna Kea Obs. (568)256 centaur 32.50.374320.444.5— MPC  · JPL
2008 BN1830 January 2008 Spacewatch ( 291 )11 damocloid 35.20.93292.667.8— MPC  · JPL
2008 JO4111 May 2008 Mauna Kea Obs. ( 568 )79 SDO 86.70.544939.9133.4— MPC  · JPL
2008 LD187 June 2008Mauna Kea Obs. (568)81other TNO40.20.31152852.5— MPC  · JPL
2008 TA2397 October 2008 D. J. Tholen ( T14 )144 plutino 39.70.13235.743.8— MPC  · JPL
2008 UA33226 October 2008L. H. Wasserman ( 807 )219 res  · 1:4 76.40.513137.1115.6— MPC  · JPL

2009–2023

2024

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2024 AW1510 January 2024 WFST ( O18 )164 plutino 39.70.3427.951.5— MPC  · JPL
2024 CC307 February 2024Cerro Tololo-DECam ( W84 )——58.40.18452.664.2— MPC  · JPL
2024 CE307 February 2024Cerro Tololo-DECam (W84)——37.30.12633.740.9— MPC  · JPL
2024 DJ418 February 2024 Pan-STARRS 1 ( F51 )4 unusual 38.70.92253.274.3— MPC  · JPL
2024 EL74 March 2024 KMTNet-CTIO ( W93 )160 cubewano (cold)?430.1138.747.4— MPC  · JPL
2024 FA2716 March 2024Cerro Tololo-DECam ( W84 )——88.50.8917.8159.1— MPC  · JPL
2024 FB2716 March 2024Cerro Tololo-DECam (W84)——38.40.11234.142.7— MPC  · JPL
2024 FV2419 March 2024 Pan-STARRS 1 ( F51 )7 SDO 61.70.89316.6116.8— MPC  · JPL
2024 FX2616 March 2024Cerro Tololo-DECam ( W84 )——251.20.841640.9461.5— MPC  · JPL
2024 FY2616 March 2024Cerro Tololo-DECam (W84)——80.60.59632.9128.3— MPC  · JPL
2024 FZ2616 March 2024Cerro Tololo-DECam (W84)——48.20.29834.461.9— MPC  · JPL
2024 GF303 April 2024Cerro Tololo-DECam (W84)——42.50.163735.649.3— MPC  · JPL
2024 GG303 April 2024Cerro Tololo-DECam (W84)——46.90.413127.966— MPC  · JPL
2024 GT44 April 2024ATLAS–SAAO ( M22 )146 centaur 33.40.543515.451.4— MPC  · JPL
2024 JD272 May 2024 Pan-STARRS 1 ( F51 )3 damocloid 41.40.93583.179.8— MPC  · JPL
2024 JL237 May 2024Pan-STARRS 2 ( F52 )19 SDO 76.50.852211.5141.4— MPC  · JPL
2024 LY915 June 2024Pan-STARRS 2 (F52)24SDO60.20.841469.7110.7— MPC  · JPL
2024 OR430 July 2024 Purple Mountain Observatory, XuYi Station ( D29 )102 centaur 35.80.521917.254.4— MPC  · JPL
2024 PL1715 August 2024 Pan-STARRS 1 ( F51 )24 SDO 87.40.931426.6168.2— MPC  · JPL
2024 PP383 August 2024Pan-STARRS 1 (F51)——187.30.971536.3368.4— MPC  · JPL
2024 PP815 August 2024 Calar Alto-Schmidt ( Z84 )4 damocloid 92.40.971362.9181.9— MPC  · JPL
2024 QX127 August 2024 Pan-STARRS 1 ( F51 )4damocloid255.80.991443.1508.5— MPC  · JPL
2024 RA2211 September 2024Pan-STARRS 2 ( F52 )92 centaur 53.60.642619.487.8— MPC  · JPL
2024 RQ111 September 2024Pan-STARRS 2 (F52)2.3 damocloid 58.20.951332.7113.7— MPC  · JPL
2024 TF33 October 2024Pan-STARRS 2 (F52)42 centaur 47.90.778910.984.8— MPC  · JPL
2024 XN258 December 2024Pan-STARRS 2 (F52)2.7 damocloid 55.40.95982.7108.1— MPC  · JPL
2024 XS152 December 2024 Kitt Peak Obs.-Bok ( V00 )4 centaur 48.10.89295.391— MPC  · JPL

2025

Designation First Observed (discovered) D (km)Orbital descriptionRemarksRefs
Date Observer
(Site)		Class a
(AU)		 e i
(°)		 q
(AU)		 Q
(AU)
2025 BD419 January 2025 Pan-STARRS 1 ( F51 )52 centaur 73.10.841011.7134.4— MPC  · JPL
2025 BU1027 January 2025 Mt. Lemmon Survey ( G96 )14centaur78.10.91547.3149— MPC  · JPL
2025 DB5125 February 2025 Kitt Peak Obs.-Bok ( V00 )48centaur500.60.9710513.7987.6— MPC  · JPL
2025 DZ4824 February 2025 Mt. Lemmon Survey ( G96 )19centaur33.90.81636.461.4— MPC  · JPL
2025 FU1222 March 2025 Pan-STARRS 2 ( F52 )30centaur42.90.7915976.9— MPC  · JPL
2025 FX1930 March 2025Pan-STARRS 1 ( F51 )75centaur38.70.664113.364.2— MPC  · JPL
2025 GG2 April 2025Pan-STARRS 1 (F51)54centaur540.812210.497.6— MPC  · JPL
2025 ML5822 April 2025Simonyi Survey Telescope Rubin Obs. ( X05 )——51.10.41630.771.5— MPC  · JPL
2025 MM662 May 2025Simonyi Survey Telescope Rubin Obs. (X05)——47.50.23936.858.2— MPC  · JPL
2025 MP3522 April 2025Simonyi Survey Telescope Rubin Obs. (X05)——46.10.191037.354.9— MPC  · JPL
2025 MV132 May 2025Simonyi Survey Telescope Rubin Obs. (X05)——39.20.252229.648.9— MPC  · JPL
2025 MW4728 April 2025Simonyi Survey Telescope Rubin Obs. (X05)——39.10.32726.851.5— MPC  · JPL
2025 OO122 July 2025 Pan-STARRS 2 ( F52 )——52.70.262038.966.6— MPC  · JPL
2025 PA215 August 2025Pan-STARRS 2 (F52)——42.80.2934.251.4— MPC  · JPL
2025 QY216 August 2025 WFST ( O18 )——54.40.491027.581.2— MPC  · JPL
2025 RY1115 September 2025Pan-STARRS 2 ( F52 )——34.90.82176.463.3— MPC  · JPL

See also

References

  1. 1 2 3 "List of Known Trans-Neptunian Objects". Johnston's Archive. 19 June 2025. Retrieved 19 October 2025.
  2. 1 2 3 "List Of Transneptunian Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  3. 1 2 3 "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  4. 1 2 3 "List Of Other Unusual Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  5. 1 2 3 "MPC Database Search: a ≥ 30.1 AU". Minor Planet Center. Archived from the original on 19 October 2025. Retrieved 19 October 2025. 5548 trans-Neptunian objects
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