The following is a partial list of unnumbered trans-Neptunian objects for principal designations assigned within 2021. , it contains a total of 123 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) D (km) Orbital description Remarks Refs Date Observer(Site) Class a e i q Q 12 January 2021 Maunakea () 40 cubewano (cold)? 34.1 0.10 2 30.6 37.5 albedo: 0.152 18 January 2021 Las Campanas Observatory () 126 res2:5 55.5 0.38 12 34.6 76.3 albedo: 0.126 15 February 2021 Maunakea () 131 SDO 57.1 0.35 13 37.4 76.9 albedo: 0.124 15 February 2021 Maunakea () 265 cubewano (cold) 44.1 0.04 3 42.4 45.9 albedo: 0.152 15 February 2021 Maunakea () 266 res2:7 70.0 0.49 23 36.0 104.0 albedo: 0.126 15 February 2021 Maunakea () 169 SDO 56.8 0.40 9 34.1 79.5 albedo: 0.124 15 February 2021 Maunakea () 150 other TNO 55.0 0.12 38 48.5 61.4 albedo: 0.13 7 February 2021 Pan-STARRS 1 () 20 centaur 401.8 0.97 9 10.6 793.1 albedo: 0.058 17 February 2021 Subaru Telescope, Maunakea () 78 cubewano (cold)? 43.2 0.13 3 37.7 48.6 albedo: 0.152 17 February 2021 Maunakea () 372 SDO 62.3 0.23 30 48.0 76.6 albedo: 0.124 17 February 2021 Subaru Telescope, Maunakea () 133 other TNO 52.5 0.11 18 46.5 58.5 albedo: 0.13 17 February 2021 Maunakea () 233 cubewano (hot) 46.1 0.13 11 39.9 52.3 albedo: 0.079 17 February 2021 Maunakea () 167 res2:5? 55.3 0.25 25 41.4 69.2 albedo: 0.126 17 February 2021 Maunakea () 169 EDDO 837.3 0.95 15 44.6 1630.0 albedo: 0.124 17 February 2021 Mt. Lemmon Survey () 9 damocloid 34.4 0.89 149 3.9 64.9 albedo: 0.048 17 February 2021 Maunakea () 115 cubewano (cold) 45.9 0.04 2 43.9 47.9 binary: 72 km; albedo: 0.152 16 February 2021 Maunakea () 113 SDO 83.7 0.55 28 37.4 130.1 albedo: 0.124 17 February 2021 Maunakea () 154 cubewano (cold) 44.3 0.06 3 41.8 46.8 binary: 106 km; albedo: 0.152 17 February 2021 Maunakea () 172 cubewano (cold)? 47.2 0.11 3 41.9 52.5 albedo: 0.152 16 February 2021 Maunakea () 191 other TNO 51.1 0.16 23 42.7 59.4 albedo: 0.13 16 February 2021 Maunakea () 253 SDO 61.6 0.40 4 37.0 86.2 albedo: 0.124 16 February 2021 Maunakea () 217 res2:5 55.6 0.41 3 32.7 78.6 albedo: 0.126 17 February 2021 Maunakea () 716 SDO 67.7 0.43 30 38.6 96.8 albedo: 0.124 17 February 2021 Maunakea () 216 cubewano (cold) 43.7 0.05 3 41.5 45.9 binary: 138 km; albedo: 0.152 5 March 2021 Lowell Discovery Telescope () 277 centaur 42.8 0.34 8 28.2 57.3 albedo: 0.058 17 March 2021 Las Campanas Observatory () 97 SDO 67.9 0.44 18 37.9 97.9 albedo: 0.124 9 April 2021 Pan-STARRS 1 () 3 damocloid 84.5 0.96 125 3.4 165.7 albedo: 0.048 5 April 2021 Korea Microlensing Telescope Network-CTIO () 122 SDO 60.7 0.33 12 40.9 80.6 albedo: 0.124 12 April 2021 Korea Microlensing Telescope Network-CTIO () 100 cubewano (cold) 42.4 0.03 1 41.2 43.7 albedo: 0.152 9 June 2021 New Horizons KBO Search () 157 plutino 39.3 0.20 5 31.4 47.1 albedo: 0.074 9 June 2021 New Horizons KBO Search () 83 cubewano (cold)? 42.4 0.03 2 41.3 43.5 albedo: 0.152 9 June 2021 New Horizons KBO Search () 61 cubewano (cold)? 42.0 0.11 3 37.4 46.6 albedo: 0.152 9 June 2021 New Horizons KBO Search () 31 twotino 47.5 0.23 9 36.3 58.6 albedo: 0.126 9 June 2021 New Horizons KBO Search () 66 cubewano (cold)? 46.2 0.13 2 40.3 52.2 albedo: 0.152 9 June 2021 New Horizons KBO Search () 111 plutino 39.2 0.30 2 27.3 51.1 albedo: 0.074 — — — — 40.2 0.04 15 38.8 41.7 — 9 June 2021 New Horizons KBO Search () 71 cubewano (cold)? 44.1 0.08 3 40.5 47.6 albedo: 0.152 9 June 2021 New Horizons KBO Search () 48 cubewano (hot)? 41.4 0.10 18 37.3 45.6 albedo: 0.079 9 June 2021 New Horizons KBO Search () 37 cubewano (cold)? 43.5 0.05 1 41.3 45.6 albedo: 0.152 9 June 2021 New Horizons KBO Search () 52 cubewano (cold)? 43.9 0.04 2 42.2 45.6 albedo: 0.152 9 June 2021 New Horizons KBO Search () 67 cubewano (cold)? 44.0 0.05 4 41.8 46.2 albedo: 0.152 9 June 2021 New Horizons KBO Search () 76 SDO 85.9 0.57 16 37.0 134.8 albedo: 0.124 8 June 2021 Canada-France-Hawaii Telescope, Maunakea () 79 plutino 39.3 0.22 23 30.8 47.8 albedo: 0.074 12 June 2021 DECam () 574 SDO 55.6 0.36 10 35.7 75.6 albedo: 0.124 9 June 2021 New Horizons KBO Search () 43 cubewano (cold)? 42.6 0.01 2 42.0 43.1 albedo: 0.152 3 June 2021 Canada-France-Hawaii Telescope, Maunakea () 90 other TNO 39.4 0.02 19 38.7 40.2 albedo: 0.13 13 June 2021 Cerro Tololo Observatory, La Serena () 131 SDO 88.3 0.63 15 32.9 143.7 albedo: 0.124 9 June 2021 New Horizons KBO Search () 81 cubewano (cold)? 43.7 0.09 1 39.7 47.8 albedo: 0.152 6 June 2021 Cerro Tololo Observatory, La Serena () 295 twotino 47.6 0.23 8 36.6 58.6 albedo: 0.126 9 June 2021 New Horizons KBO Search () 54 plutino 39.2 0.20 5 31.3 47.2 albedo: 0.074 6 June 2021 Cerro Tololo Observatory, La Serena () 182 SDO 63.2 0.44 15 35.5 90.9 albedo: 0.124 9 June 2021 New Horizons KBO Search () 57 plutino 39.0 0.25 19 29.4 48.6 albedo: 0.074 7 June 2021 Cerro Tololo Observatory, La Serena () 215 SDO 169.1 0.77 9 39.4 298.8 albedo: 0.124 9 June 2021 New Horizons KBO Search () 52 res2:5 55.1 0.43 5 31.7 78.5 albedo: 0.126 6 June 2021 Cerro Tololo Observatory, La Serena () 224 res1:3 61.9 0.38 12 38.6 85.1 albedo: 0.126 9 June 2021 New Horizons KBO Search () 249 cubewano (hot)? 47.4 0.10 21 42.9 51.9 albedo: 0.079 11 June 2021 Cerro Tololo Observatory, La Serena () 162 SDO 76.3 0.49 33 38.9 113.7 albedo: 0.124 9 June 2021 New Horizons KBO Search () 96 plutino 39.3 0.18 7 32.4 46.2 albedo: 0.074 7 June 2021 Cerro Tololo Observatory, La Serena () 176 SDO 91.0 0.60 4 36.6 145.3 albedo: 0.124 9 June 2021 New Horizons KBO Search () 69 cubewano (cold)? 43.1 0.02 2 42.3 43.8 albedo: 0.152 9 June 2021 New Horizons KBO Search () 36 cubewano (cold)? 46.6 0.13 4 40.4 52.9 albedo: 0.152 9 June 2021 New Horizons KBO Search () 188 cubewano (cold) 42.6 0.02 3 41.8 43.4 albedo: 0.152 9 June 2021 New Horizons KBO Search () 37 twotino 47.2 0.30 2 32.9 61.4 albedo: 0.126 9 June 2021 New Horizons KBO Search () 54 plutino 39.3 0.18 7 32.3 46.4 albedo: 0.074 9 June 2021 New Horizons KBO Search () 39 SDO 61.9 0.29 24 43.7 80.1 albedo: 0.124 9 June 2021 New Horizons KBO Search () 102 cubewano (cold)? 43.8 0.07 2 40.9 46.7 albedo: 0.152 9 June 2021 New Horizons KBO Search () 55 cubewano (cold)? 43.2 0.02 2 42.3 44.2 albedo: 0.152 9 June 2021 New Horizons KBO Search () 198 plutino 39.4 0.14 3 34.0 44.8 albedo: 0.074 9 June 2021 New Horizons KBO Search () 72 cubewano (hot)? 45.8 0.13 5 40.0 51.5 albedo: 0.079 9 June 2021 New Horizons KBO Search () 75 SDO 58.2 0.39 4 35.7 80.7 albedo: 0.124 9 June 2021 New Horizons KBO Search () 97 cubewano (cold)? 43.3 0.11 2 38.6 48.1 albedo: 0.152 9 June 2021 New Horizons KBO Search () 74 cubewano (cold)? 43.6 0.04 2 42.1 45.1 albedo: 0.152 17 June 2021 New Horizons KBO Search () 60 cubewano (cold)? 45.3 0.08 2 41.8 48.9 albedo: 0.152 17 June 2021 New Horizons KBO Search () 79 plutino 39.3 0.24 8 29.9 48.7 albedo: 0.074 17 June 2021 New Horizons KBO Search () 87 plutino 39.3 0.22 7 30.6 48.0 albedo: 0.074 17 June 2021 New Horizons KBO Search () 45 plutino 39.3 0.24 3 30.0 48.5 albedo: 0.074 17 June 2021 New Horizons KBO Search () 55 cubewano (cold)? 44.5 0.09 4 40.6 48.4 albedo: 0.152 5 July 2021 New Horizons KBO Search () 141 unusual 37.3 0.91 21 3.4 71.2 albedo: 0.051 29 August 2021 Cerro Tololo Observatory, La Serena () 186 SDO 63.7 0.53 4 30.2 97.2 albedo: 0.124 29 August 2021 Cerro Tololo Observatory, La Serena () 158 centaur 33.7 0.29 18 23.8 43.7 albedo: 0.058 31 August 2021 Cerro Tololo Observatory, La Serena () 268 SDO 61.6 0.42 21 35.8 87.3 albedo: 0.124 29 August 2021 Cerro Tololo Observatory, La Serena () 159 cubewano (cold) 42.9 0.02 2 42.2 43.6 albedo: 0.152 29 August 2021 Cerro Tololo Observatory, La Serena () 211 res1:6 98.2 0.58 22 41.2 155.2 albedo: 0.126 5 September 2021 DECam () 55 SDO 53.8 0.36 2 34.4 73.2 albedo: 0.124 5 September 2021 DECam () 51 cubewano (cold) 42.9 0.04 2 41.4 44.5 albedo: 0.152 5 September 2021 DECam () 82 cubewano (cold) 45.8 0.08 1 41.9 49.7 albedo: 0.152 4 September 2021 DECam () 111 cubewano (hot) 41.7 0.13 33 36.2 47.3 albedo: 0.079 5 September 2021 DECam () 61 cubewano (cold) 45.6 0.12 2 40.0 51.1 albedo: 0.152 5 September 2021 DECam () 52 cubewano (cold) 44.1 0.09 4 40.2 48.0 albedo: 0.152 9 September 2021 DECam () 58 cubewano (cold) 43.2 0.07 2 40.0 46.3 albedo: 0.152 5 September 2021 DECam () 66 cubewano (cold) 44.5 0.05 2 42.2 46.8 albedo: 0.152 9 September 2021 DECam () 52 cubewano (cold) 43.9 0.03 2 42.7 45.1 albedo: 0.152 5 September 2021 DECam () 49 cubewano (cold) 42.9 0.06 4 40.5 45.4 albedo: 0.152 5 September 2021 DECam () 35 SDO 81.5 0.55 14 37.0 126.0 albedo: 0.124 13 September 2021 Pan-STARRS 1 () 2.7 damocloid 105.9 0.96 103 4.0 207.7 albedo: 0.048 9 September 2021 DECam () 116 plutino 39.4 0.19 12 31.9 46.9 albedo: 0.074 9 September 2021 DECam () 105 SDO 91.0 0.59 24 37.8 144.1 albedo: 0.124 9 September 2021 DECam () 55 cubewano (cold) 45.6 0.07 3 42.4 48.8 albedo: 0.152 6 September 2021 DECam () 66 cubewano (cold) 43.0 0.05 1 40.7 45.3 albedo: 0.152 5 September 2021 Maunakea () 169 EDDO 973.8 0.94 8 55.6 1891.9 albedo: 0.124 9 September 2021 DECam () 69 cubewano (hot) 43.3 0.09 21 39.5 47.0 albedo: 0.079 4 September 2021 DECam () 90 cubewano (cold) 43.1 0.01 1 42.6 43.7 albedo: 0.152 6 September 2021 DECam () 117 plutino 39.5 0.12 3 34.6 44.4 albedo: 0.074 6 September 2021 DECam () 93 cubewano (cold) 44.3 0.06 1 41.7 46.9 albedo: 0.152 6 September 2021 DECam () 71 cubewano (cold) 44.4 0.07 3 41.3 47.5 albedo: 0.152 3 September 2021 Cerro Tololo Observatory, La Serena () 248 SDO 61.0 0.44 14 34.2 87.9 albedo: 0.124 6 September 2021 DECam () 59 SDO 51.4 0.26 0 38.3 64.5 albedo: 0.124 9 September 2021 DECam () 66 SDO 81.2 0.52 29 39.3 123.0 albedo: 0.124 7 September 2021 Maunakea () 121 SDO 76.6 0.33 42 51.5 101.7 albedo: 0.124 4 September 2021 DECam () 118 cubewano (cold) 46.0 0.13 4 40.1 51.8 albedo: 0.152 7 September 2021 DECam () 217 SDO 77.1 0.51 21 37.6 116.6 albedo: 0.124 6 September 2021 DECam () 69 cubewano (cold) 44.2 0.07 1 41.2 47.2 albedo: 0.152 6 September 2021 DECam () 79 cubewano (cold) 42.7 0.04 3 41.0 44.3 albedo: 0.152 5 September 2021 DECam () 65 cubewano (cold) 43.1 0.03 2 42.0 44.1 albedo: 0.152 7 September 2021 DECam () 74 cubewano (hot) 43.6 0.08 15 39.9 47.3 albedo: 0.079 11 October 2021 Pan-STARRS 1 () 73 other TNO 39.8 0.46 155 21.6 57.9 albedo: 0.13 2 October 2021 DECam () 99 cubewano (cold) 43.0 0.04 2 41.3 44.7 albedo: 0.152 4 October 2021 DECam () 125 SDO 52.4 0.28 10 37.5 67.3 albedo: 0.124 6 October 2021 DECam () 97 cubewano (cold) 44.0 0.05 2 41.9 46.2 albedo: 0.152 4 October 2021 DECam () 48 cubewano (cold)? 45.8 0.08 3 42.1 49.6 albedo: 0.152 17 October 2021 Mt. Lemmon Survey () 1 damocloid 38.0 0.95 155 1.9 74.1 albedo: 0.048 3 December 2021 Mt. Graham-VATT () 153 other TNO 48.9 0.29 12 34.5 63.3 albedo: 0.13 3 December 2021 Mt. Lemmon Survey () 3 damocloid 39.1 0.90 97 3.9 74.3 albedo: 0.048
References