# List of unnumbered trans-Neptunian objects: 2021

This is a list of unnumbered trans-Neptunian objects for objects with provisional designations assigned within 2021. As of February 2025, it contains a total of 113 bodies. For more information see the description on the main page. Also see list for the previous and next year.

## 2021

| Designation | First Observed (discovered) | First Observed (discovered) | D (km) | Orbital description | Orbital description | Orbital description | Orbital description | Orbital description | Orbital description | Remarks | Refs |
| Designation | Date | Observer (Site) | D (km) | Class | a (AU) | e | i (°) | q (AU) | Q (AU) | Remarks | Refs |
| 2021 AN$_{28}$ | 12 January 2021 | Mauna Kea Obs. (568) | 44 | cubewano? | 34.0 | 0.09 | 1 | 30.6 | 37.4 | — | MPC · JPL |
| 2021 BK$_{15}$ | 18 January 2021 | Las Campanas Obs. (304) | 125 | res · 2:5 | 55.3 | 0.37 | 11 | 34.5 | 76.1 | — | MPC · JPL |
| 2021 CG$_{56}$ | 15 February 2021 | Mauna Kea Obs. (568) | | | 57.0 | 0.34 | 13 | 37.2 | 76.9 | not in Johnston's Archive | MPC · JPL |
| 2021 CJ$_{46}$ | 15 February 2021 | Mauna Kea Obs. (568) | 263 | cubewano (cold) | 44.1 | 0.03 | 3 | 42.3 | 45.8 | — | MPC · JPL |
| 2021 CK$_{46}$ | 15 February 2021 | Mauna Kea Obs. (568) | 243 | res · 2:7 | 69.8 | 0.48 | 22 | 36.0 | 103 | — | MPC · JPL |
| 2021 CL$_{46}$ | 15 February 2021 | Mauna Kea Obs. (568) | 167 | SDO | 69.8 | 0.39 | 9 | 34.1 | 76.3 | — | MPC · JPL |
| 2021 CP$_{40}$ | 15 February 2021 | Mauna Kea Obs. (568) | 153 | SDO | 54.9 | 0.11 | 38 | 48.4 | 61.4 | — | MPC · JPL |
| 2021 CP$_5$ | 7 February 2021 | Pan-STARRS (F51) | 20 | centaur | 332 | 0.97 | 9 | 10.6 | 654 | — | MPC · JPL |
| 2021 DM$_{15}$ | 17 February 2021 | Mauna Kea Obs. (568) | 87 | cubewano? | 45.4 | 0.03 | 2 | 43.9 | 47.0 | binary: 70 km | MPC · JPL |
| 2021 DN$_{15}$ | 17 February 2021 | Mauna Kea Obs. (568) | 98 | cubewano? | 43.8 | 0.04 | 3 | 41.9 | 45.7 | binary: 93 km | MPC · JPL |
| 2021 DO$_{15}$ | 16 February 2021 | Mauna Kea Obs. (568) | 208 | other TNO | 50.9 | 0.18 | 23 | 41.6 | 60.2 | — | MPC · JPL |
| 2021 DP$_{15}$ | 16 February 2021 | Mauna Kea Obs. (568) | 214 | SDO | 90.0 | 0.66 | 4 | 30.8 | 149 | — | MPC · JPL |
| 2021 DQ$_{15}$ | 16 February 2021 | Mauna Kea Obs. (568) | 307 | centaur | 79.4 | 0.65 | 3 | 27.9 | 131 | — | MPC · JPL |
| 2021 DR15 | 10 March 2005 | Apache Point-Sloan Digital Sky Survey (645) | 713 | SDO | 67.2 | 0.44 | 31 | 37.8 | 96.5 | — | MPC · JPL |
| 2021 DS$_{15}$ | 17 February 2021 | Mauna Kea Obs. (568) | 144 | cubewano? | 43.3 | 0.05 | 3 | 41.2 | 45.4 | binary: 119 km | MPC · JPL |
| 2021 DG$_{17}$ | 17 February 2021 | Mauna Kea Obs. (568) | 370 | SDO | 62.2 | 0.23 | 30 | 47.8 | 76.5 | — | MPC · JPL |
| 2021 DH$_{17}$ | 17 February 2021 | Mauna Kea Obs. (568) | 231 | cubewano (cold) | 46.0 | 0.13 | 10 | 41.3 | 52.2 | — | MPC · JPL |
| 2021 DJ$_{17}$ | 17 February 2021 | Mauna Kea Obs. (568) | 166 | res · 2:5 | 55.2 | 0.25 | 24 | 47.8 | 61.4 | — | MPC · JPL |
| 2021 DK$_{18}$ | 17 February 2021 | Mauna Kea Obs. (568) | 140 | EDDO | 811 | 0.94 | 15 | 44.5 | 1578 | — | MPC · JPL |
| 2021 DM$_{19}$ | 17 February 2021 | Mauna Kea Obs. (568) | 113 | SDO | 83.7 | 0.55 | 27 | 37.1 | 130 | — | MPC · JPL |
| 2021 DN$_{19}$ | 17 February 2021 | Mauna Kea Obs. (568) | 171 | cubewano? | 47.1 | 0.11 | 3 | 41.8 | 52.4 | — | MPC · JPL |
| 2021 EE$_{44}$ | 5 March 2021 | Lowell Discovery Tel. (G37) | 279 | centaur? | 42.4 | 0.34 | 8 | 27.9 | 56.9 | — | MPC · JPL |
| 2021 GU$_{122}$ | 5 April 2021 | Korea Microlensing Telescope Network-CTIO (W93) | 90 | cubewano? | 60.5 | 0.33 | 12 | 40.9 | 80.1 | — | MPC · JPL |
| 2021 GW$_{122}$ | 12 April 2021 | Korea Microlensing Telescope Network-CTIO (W93) | 82 | cubewano? | 42.6 | 0.07 | 1 | 39.5 | 45.8 | — | MPC · JPL |
| 2021 RR205 | 5 September 2021 | Mauna Kea Obs. | 200 | sednoid | 990.9 | 0.943 | 7.644 | 55.541 | 1926 | — | MPC · JPL |