List of unnumbered trans-Neptunian objects

For the list of numbered TNOs, see List of trans-Neptunian objects.
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

Distribution of 5,630 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 May 2026, there are 4,969 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
'26
TNOs by year of principle designation since 1992 (objects with a < 30.1 AU excluded). As of May 2026, there are    4,969 unnumbered TNOs and    1,049 numbered TNOs (Pluto from 1930 is not shown)[2][3][4][5]
  •   Numbered TNOs: 1,049 obj. (17.4%)
  •   Unnumbered TNOs: 4,969 obj. (82.6%)
Split-up of numbered and unnumbered trans-Neptunian objects[2][3][4][5]

List

See also: List of possible dwarf planets § list
See also: Minor-planet moon § Trans-Neptunian objects

1993

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1993 RP 15 September 1993 D. C. Jewitt, J. X. Luu (568) 50 res · 4:5 35.3 0.06 4 33.1 37.5 albedo: 0.126 MPC · JPL

1994

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1994 ES2 13 March 1994 J. X. Luu, D. C. Jewitt (568) 83 cubewano (cold) 45.8 0.11 1 40.6 50.9 albedo: 0.152; BRmag: 1.65 MPC · JPL
1994 TG 3 October 1994 Maunakea (568) 188 cubewano (hot) 42.3 0.00 7 42.3 42.3 albedo: 0.079 MPC · JPL
1994 TG2 8 October 1994 European Southern Observatory, La Silla (809) 136 cubewano (cold)? 42.4 0.00 2 42.4 42.4 albedo: 0.152 MPC · JPL
1994 TH 3 October 1994 Maunakea (568) 147 other TNO 40.9 0.00 16 40.9 40.9 albedo: 0.13 MPC · JPL

1995

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1995 DB2 24 February 1995 D. C. Jewitt, J. X. Luu (568) 96 cubewano (cold) 46.5 0.14 4 40.1 53.0 albedo: 0.152 MPC · JPL
1995 FB21 29 March 1995 Siding Spring Observatory (413) 108 cubewano (cold)? 42.4 0.00 1 42.4 42.4 albedo: 0.152 MPC · JPL
1995 GA7 3 April 1995 Maunakea (568) 154 plutino? 39.5 0.12 4 34.8 44.2 albedo: 0.074 MPC · JPL
1995 GJ 3 April 1995 Maunakea (568) 188 cubewano (hot)? 42.9 0.09 23 39.0 46.8 albedo: 0.079 MPC · JPL
1995 GY7 6 April 1995 European Southern Observatory, La Silla (809) 108 cubewano (cold)? 41.3 0.00 1 41.3 41.3 albedo: 0.152 MPC · JPL
1995 KJ1 30 May 1995 Maunakea (568) 171 cubewano (cold)? 43.5 0.00 3 43.5 43.5 albedo: 0.152 MPC · JPL
1995 KK1 30 May 1995 Maunakea (568) 74 other TNO 39.5 0.19 9 32.0 47.0 albedo: 0.13 MPC · JPL
1995 YY3 24 December 1995 Maunakea (568) 74 other TNO 39.6 0.22 0 30.8 48.4 albedo: 0.13 MPC · JPL

1996

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1996 AS20 14 January 1996 Spacewatch (691) 76 centaur 35.8 0.62 11 13.6 58.0 albedo: 0.058 MPC · JPL
1996 KV1 21 May 1996 C. A. Trujillo, D. C. Jewitt, J. X. Luu (568) 164 cubewano (hot) 45.0 0.11 8 40.2 49.9 albedo: 0.079 MPC · JPL
1996 KX1 22 May 1996 Maunakea (568) 97 plutino? 39.5 0.10 2 35.7 43.4 albedo: 0.074 MPC · JPL
1996 KY1 16 May 1996 Maunakea (568) 123 plutino? 39.5 0.10 31 35.7 43.3 albedo: 0.074 MPC · JPL
1996 PW 9 August 1996 NEAT (566) 10 damocloid 272.4 0.99 30 2.6 542.2 albedo: 0.048 MPC · JPL
1996 RQ20 6 September 1996 D. L. Rabinowitz (675) 185 cubewano (hot) 44.1 0.10 32 39.6 48.7 albedo: 0.079; BRmag: 1.57; taxonomy: IR MPC · JPL

1997

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1997 CW29 8 February 1997 Maunakea (568) 245 plutino? 39.4 0.08 19 36.3 42.5 albedo: 0.074 MPC · JPL
1997 GA45 3 April 1997 B. Gladman (568) 90 cubewano (hot)? 47.1 0.18 8 38.8 55.4 albedo: 0.079 MPC · JPL
1997 QH4 27 August 1997 D. C. Jewitt, C. A. Trujillo, J. X. Luu, K. Berney (568) 188 cubewano (hot) 42.9 0.09 13 39.1 46.7 albedo: 0.079; BRmag: 1.94; taxonomy: RR MPC · JPL
1997 RL13 5 September 1997 Palomar Mountain (675) 60 cubewano (hot)? 44.5 0.00 6 44.5 44.5 albedo: 0.079 MPC · JPL
1997 RX9 7 September 1997 B. Gladman (675) 103 cubewano (hot) 41.7 0.05 30 39.6 43.8 albedo: 0.079 MPC · JPL
1997 RY6 6 September 1997 La Palma (950) 150 cubewano (hot) 41.4 0.00 12 41.4 41.4 albedo: 0.079 MPC · JPL
1997 TX8 5 October 1997 Palomar Mountain (675) 94 cubewano (hot)? 39.3 0.19 9 32.0 46.6 albedo: 0.079 MPC · JPL
1997 UG25 26 October 1997 La Palma (950) 68 cubewano (cold)? 43.3 0.00 1 43.3 43.3 albedo: 0.152 MPC · JPL

1998

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
1998 FS144 23 March 1998 Northfield Mount Hermon School (807) 213 cubewano (hot) 41.7 0.02 10 40.7 42.7 albedo: 0.079; BRmag: 1.53; taxonomy: IR MPC · JPL
1998 HL151 29 April 1998 D. C. Jewitt, J. X. Luu, C. A. Trujillo, D. J. Tholen (568) 88 other TNO 40.6 0.09 28 36.9 44.3 albedo: 0.13; BRmag: 1.06 MPC · JPL
1998 HN151 21 April 1998 J. Kormendy, R. Wainscoat, D. J. Tholen, D. C. Jewitt (568) 83 other TNO 37.9 0.05 25 35.9 39.8 albedo: 0.13 MPC · JPL
1998 HO151 22 April 1998 R. Wainscoat, J. Kormendy, D. C. Jewitt, J. X. Luu (568) 108 cubewano (hot) 41.3 0.09 17 37.5 45.1 albedo: 0.079 MPC · JPL
1998 HR151 28 April 1998 Maunakea (568) 90 cubewano (hot)? 45.5 0.12 7 39.9 51.1 albedo: 0.079 MPC · JPL
1998 KD66 29 May 1998 Cerro Tololo Observatory, La Serena (807) 78 cubewano (hot)? 43.1 0.05 5 40.9 45.3 albedo: 0.079 MPC · JPL
1998 KE66 29 May 1998 Cerro Tololo Observatory, La Serena (807) 54 cubewano (cold)? 42.1 0.00 3 42.1 42.1 albedo: 0.152 MPC · JPL
1998 KF66 29 May 1998 Cerro Tololo Observatory, La Serena (807) 54 plutino? 39.5 0.21 6 31.1 47.9 albedo: 0.074 MPC · JPL
1998 KG66 29 May 1998 Cerro Tololo Observatory, La Serena (807) 57 cubewano (cold)? 45.2 0.00 4 45.2 45.2 albedo: 0.152 MPC · JPL
1998 KS65 29 May 1998 G. Bernstein (807) 101 cubewano (cold) 43.7 0.03 1 42.3 45.2 albedo: 0.152; BRmag: 1.73; taxonomy: RR-IR MPC · JPL
1998 KY61 29 May 1998 G. Bernstein (807) 119 cubewano (cold) 44.3 0.05 2 42.1 46.5 albedo: 0.152 MPC · JPL
1998 UR43 22 October 1998 M. W. Buie (695) 106 plutino 39.8 0.23 9 30.8 48.9 albedo: 0.074; BRmag: 1.27; taxonomy: BR MPC · JPL
1998 WS31 18 November 1998 M. W. Buie (695) 107 plutino 39.7 0.21 7 31.5 47.9 albedo: 0.074; BRmag: 1.32; taxonomy: IR-BR MPC · JPL
1998 WV24 18 November 1998 M. W. Buie (695) 162 plutino? 39.2 0.04 2 37.8 40.7 binary: 106 km; albedo: 0.074; BRmag: 1.27; taxonomy: BR MPC · JPL
1998 WV31 19 November 1998 M. W. Buie (695) 118 plutino 39.5 0.27 6 28.9 50.2 albedo: 0.074; BRmag: 1.34; taxonomy: BR MPC · JPL
1998 WW31 18 November 1998 M. W. Buie (695) 145 cubewano (hot) 44.9 0.08 7 41.3 48.5 binary: 121 km; albedo: 0.16 MPC · JPL
1998 WX24 18 November 1998 M. W. Buie (695) 156 cubewano (cold) 43.6 0.04 1 42.0 45.2 albedo: 0.152; BRmag: 1.79; taxonomy: RR MPC · JPL
1998 WY31 18 November 1998 M. W. Buie (695) 137 cubewano (cold) 45.5 0.12 2 40.0 51.0 albedo: 0.152 MPC · JPL
1998 WZ24 18 November 1998 Kitt Peak (695) 88 other TNO 39.5 0.18 5 32.4 46.6 albedo: 0.13 MPC · JPL
1998 WZ31 19 November 1998 M. W. Buie (695) 111 plutino 39.8 0.17 15 33.0 46.6 albedo: 0.074; BRmag: 1.26; taxonomy: IR-BR MPC · JPL

1999–2007

2008

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
2008 AP118 6 January 2008 P. A. Wiegert (568) 121 res · 4:7 43.9 0.16 1 37.0 50.8 albedo: 0.126 MPC · JPL
2008 AU138 8 January 2008 Maunakea (568) 256 centaur 32.5 0.37 43 20.4 44.5 albedo: 0.058 MPC · JPL
2008 BN18 30 January 2008 Spacewatch (291) 11 damocloid 35.2 0.93 29 2.6 67.8 albedo: 0.048 MPC · JPL
2008 JO41 11 May 2008 Maunakea (568) 79 SDO 86.7 0.54 49 39.9 133.4 albedo: 0.124 MPC · JPL
2008 LD18 7 June 2008 Maunakea (568) 81 other TNO 40.2 0.31 15 28.0 52.5 albedo: 0.13 MPC · JPL
2008 QQ53 — — — — 46.1 0.18 8 37.8 54.5 — MPC · JPL
2008 TA239 7 October 2008 D. J. Tholen (T14) 144 plutino 39.7 0.10 32 35.7 43.8 albedo: 0.074 MPC · JPL
2008 UA332 26 October 2008 L. H. Wasserman (807) 220 res · 1:4 76.4 0.51 31 37.1 115.6 albedo: 0.126; taxonomy: BR MPC · JPL

2009–2023

2024

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
2024 AW15 10 January 2024 WFST, Lenghu (O18) 164 plutino 39.7 0.30 4 27.9 51.5 albedo: 0.074 MPC · JPL
2024 CC30 7 February 2024 Cerro Tololo-DECam (W84) 152 other TNO 58.4 0.10 84 52.6 64.2 albedo: 0.13 MPC · JPL
2024 CE30 7 February 2024 Cerro Tololo-DECam (W84) 150 other TNO 37.3 0.10 26 33.7 40.9 albedo: 0.13 MPC · JPL
2024 DJ4 18 February 2024 Pan-STARRS 1 (F51) 4 unusual 38.7 0.92 25 3.2 74.3 albedo: 0.051 MPC · JPL
2024 EL7 4 March 2024 Korea Microlensing Telescope Network-CTIO (W93) 160 cubewano (cold)? 43.0 0.10 1 38.7 47.4 albedo: 0.152 MPC · JPL
2024 FA27 — — 209 centaur 74.8 0.75 8 18.7 130.8 albedo: 0.058 MPC · JPL
2024 FB27 16 March 2024 Cerro Tololo-DECam (W84) 201 other TNO 38.4 0.11 2 34.1 42.7 albedo: 0.13 MPC · JPL
2024 FV24 19 March 2024 Pan-STARRS 1 (F51) 10 centaur 61.7 0.89 31 6.6 116.8 albedo: 0.058 MPC · JPL
2024 FX26 16 March 2024 Cerro Tololo-DECam (W84) 152 SDO 251.2 0.84 16 40.9 461.5 albedo: 0.124 MPC · JPL
2024 FY26 16 March 2024 Cerro Tololo-DECam (W84) 107 SDO 80.6 0.59 6 32.9 128.3 albedo: 0.124 MPC · JPL
2024 FZ26 16 March 2024 Cerro Tololo-DECam (W84) 217 twotino 48.1 0.28 8 34.5 61.6 albedo: 0.126 MPC · JPL
2024 GF30 3 April 2024 Cerro Tololo-DECam (W84) 214 other TNO 41.6 0.17 37 34.7 48.5 albedo: 0.13 MPC · JPL
2024 GG30 3 April 2024 Cerro Tololo-DECam (W84) 163 centaur 46.9 0.41 31 27.9 66.0 albedo: 0.058 MPC · JPL
2024 GT4 4 April 2024 ATLAS South Africa, Sutherland (M22) 146 centaur 33.4 0.54 35 15.4 51.4 albedo: 0.058 MPC · JPL
2024 JD27 2 May 2024 Pan-STARRS 1 (F51) 3 damocloid 41.4 0.93 58 3.1 79.8 albedo: 0.048 MPC · JPL
2024 LY9 15 June 2024 Pan-STARRS 2 (F52) 35 centaur 60.2 0.84 146 9.7 110.7 albedo: 0.058 MPC · JPL
2024 OR4 30 July 2024 Purple Mountain Observatory, XuYi Station (D29) 107 centaur 35.8 0.52 19 17.2 54.4 albedo: 0.058 MPC · JPL
2024 PL17 15 August 2024 Pan-STARRS 1 (F51) 37 centaur 87.4 0.93 142 6.6 168.2 albedo: 0.058 MPC · JPL
2024 PP38 3 August 2024 Pan-STARRS 1 (F51) 44 centaur 187.3 0.97 153 6.3 368.4 albedo: 0.058 MPC · JPL
2024 PP8 15 August 2024 Calar Alto-Schmidt (Z84) 4 damocloid 92.4 0.97 136 2.9 181.8 albedo: 0.048 MPC · JPL
2024 QX1 27 August 2024 Pan-STARRS 1 (F51) 4 damocloid 255.8 0.99 144 3.1 508.5 albedo: 0.048 MPC · JPL
2024 RA22 11 September 2024 Pan-STARRS 2 (F52) 96 centaur 53.6 0.64 26 19.4 87.8 albedo: 0.058 MPC · JPL
2024 RQ11 1 September 2024 Pan-STARRS 2 (F52) 2.3 damocloid 58.2 0.95 133 2.7 113.7 albedo: 0.048 MPC · JPL
2024 TF3 3 October 2024 Pan-STARRS 2 (F52) 42 centaur 47.9 0.77 89 10.9 84.8 albedo: 0.058 MPC · JPL
2024 XN25 8 December 2024 Pan-STARRS 2 (F52) 2.7 damocloid 55.4 0.95 98 2.7 108.1 albedo: 0.048 MPC · JPL
2024 XR49 2 December 2024 Subaru Telescope, Maunakea (T09) 139 other TNO 48.2 0.24 19 36.4 59.9 albedo: 0.13 MPC · JPL
2024 XS15 2 December 2024 Kitt Peak-Bok (V00) 4 centaur 48.1 0.89 29 5.3 91.0 albedo: 0.058 MPC · JPL
2024 XS49 3 December 2024 Subaru Telescope, Maunakea (T09) 251 SDO 69.3 0.49 19 35.3 103.4 albedo: 0.124 MPC · JPL
2024 XT49 3 December 2024 Subaru Telescope, Maunakea (T09) 121 other TNO 47.9 0.29 9 34.2 61.6 albedo: 0.13 MPC · JPL
2024 XW49 4 December 2024 Subaru Telescope, Maunakea (T09) 92 other TNO 45.9 0.18 10 37.5 54.4 binary: 72 km; albedo: 0.13 MPC · JPL
2024 XX49 2 December 2024 Subaru Telescope, Maunakea (T09) 195 centaur 39.9 0.25 12 30.0 49.9 albedo: 0.058 MPC · JPL

2025

2026

Designation First Observed (discovered) D (km) Orbital description Remarks Refs
Date Observer
(Site) 		Class a
(AU) 		e i
(°) 		q
(AU) 		Q
(AU)
2026 AZ17 — — — — 64.6 0.96 36 2.5 126.7 — MPC · JPL
2026 HO5 — — — — 49.6 0.64 40 17.9 81.2 — MPC · JPL

See also

References

  1. ^ a b c d "List of Known Trans-Neptunian Objects". Johnston's Archive. 19 June 2025. Retrieved 19 October 2025.
  2. ^ a b c d "List Of Transneptunian Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  3. ^ a b c d "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  4. ^ a b c d "List Of Other Unusual Objects". Minor Planet Center. 19 October 2025. Retrieved 19 October 2025.
  5. ^ a b c d "MPC Database Search: a ≥ 30.1 AU". Minor Planet Center. Archived from the original on 2 November 2025. Retrieved 2 November 2025. 5561 trans-Neptunian objects
This article is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.