# List of unnumbered trans-Neptunian objects: 1999

The following is a partial list of unnumbered trans-Neptunian objects for principal designations assigned within 1999. As of April 2022, it contains a total of 94 bodies. For more information see the description on the main page. Also see list for the previous and next year.

## 1999

| 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 |
| 1999 CA$_{119}$ | 10 February 1999 | Mauna Kea Obs. (568) | 99 | cubewano? | 45.2 | 0.00 | 0 | 45.2 | 45.2 | — | MPC · JPL |
| 1999 CA$_{132}$ | 11 February 1999 | Mauna Kea Obs. (568) | 114 | cubewano? | 44.0 | 0.10 | 12 | 39.7 | 48.3 | — | MPC · JPL |
| 1999 CB$_{119}$ | 10 February 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 204 | cubewano (hot) | 46.7 | 0.12 | 9 | 40.9 | 52.5 | BR-mag: 1.93; taxonomy: RR | MPC · JPL |
| 1999 CC$_{119}$ | 10 February 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 121 | cubewano (cold) | 44.6 | 0.07 | 1 | 41.3 | 47.9 | — | MPC · JPL |
| 1999 CD$_{119}$ | 10 February 1999 | Mauna Kea Obs. (568) | 119 | cubewano? | 44.0 | 0.03 | 2 | 42.8 | 45.2 | — | MPC · JPL |
| 1999 CG$_{154}$ | 11 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 110 | cubewano (cold) | 42.8 | 0.10 | 1 | 38.7 | 46.9 | — | MPC · JPL |
| 1999 CH$_{119}$ | 11 February 1999 | C. Trujillo D. C. Jewitt J. X. Luu (568) | 158 | other TNO | 43.1 | 0.09 | 20 | 39.3 | 46.8 | — | MPC · JPL |
| 1999 CH$_{154}$ | 12 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 98 | cubewano (cold) | 42.8 | 0.01 | 1 | 42.1 | 43.4 | — | MPC · JPL |
| 1999 CJ$_{119}$ | 11 February 1999 | C. Trujillo D. C. Jewitt J. X. Luu (568) | 110 | cubewano (cold) | 45.0 | 0.06 | 3 | 42.3 | 47.8 | BR-mag: 2.07 | MPC · JPL |
| 1999 CK$_{119}$ | 11 February 1999 | Mauna Kea Obs. (568) | 90 | cubewano? | 42.1 | 0.00 | 12 | 42.1 | 42.1 | — | MPC · JPL |
| 1999 CK$_{158}$ | 10 February 1999 | D. C. Jewitt J. X. Luu C. Trujillo (568) | 91 | other TNO | 40.6 | 0.07 | 17 | 37.7 | 43.5 | — | MPC · JPL |
| 1999 CM$_{119}$ | 11 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 87 | cubewano (cold) | 43.7 | 0.10 | 3 | 39.5 | 47.9 | BR-mag: 1.78 | MPC · JPL |
| 1999 CM$_{153}$ | 11 February 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 110 | cubewano (cold) | 45.4 | 0.14 | 0 | 39.2 | 51.6 | — | MPC · JPL |
| 1999 CN$_{119}$ | 11 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 80 | cubewano (cold) | 43.5 | 0.04 | 1 | 41.7 | 45.3 | — | MPC · JPL |
| 1999 CN$_{153}$ | 11 February 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 148 | cubewano (hot) | 43.6 | 0.11 | 7 | 38.6 | 48.6 | — | MPC · JPL |
| 1999 CP$_{153}$ | 10 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 99 | cubewano? | 44.8 | 0.16 | 3 | 37.4 | 52.2 | — | MPC · JPL |
| 1999 CQ$_{133}$ | 12 February 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 213 | cubewano (hot) | 41.1 | 0.10 | 13 | 37.1 | 45.1 | BR-mag: 1.35 | MPC · JPL |
| 1999 CQ$_{153}$ | 11 February 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 83 | cubewano (cold) | 46.1 | 0.06 | 0 | 43.5 | 48.7 | — | MPC · JPL |
| 1999 CR$_{133}$ | 12 February 1999 | Mauna Kea Obs. (568) | 82 | cubewano? | 42.2 | 0.00 | 2 | 42.2 | 42.2 | — | MPC · JPL |
| 1999 CR$_{153}$ | 11 February 1999 | Mauna Kea Obs. (568) | 79 | cubewano? | 43.1 | 0.05 | 1 | 40.9 | 45.3 | — | MPC · JPL |
| 1999 CS$_{153}$ | 11 February 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 82 | cubewano? | 44.2 | 0.12 | 1 | 39.0 | 49.4 | — | MPC · JPL |
| 1999 CT$_{153}$ | 11 February 1999 | Mauna Kea Obs. (568) | 82 | cubewano? | 45.1 | 0.09 | 5 | 40.9 | 49.3 | — | MPC · JPL |
| 1999 CW$_{118}$ | 10 February 1999 | Mauna Kea Obs. (568) | 95 | cubewano? | 43.5 | 0.00 | 1 | 43.5 | 43.5 | — | MPC · JPL |
| 1999 CW$_{131}$ | 10 February 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 90 | cubewano? | 43.2 | 0.01 | 8 | 42.5 | 43.9 | — | MPC · JPL |
| 1999 CX$_{118}$ | 10 February 1999 | Mauna Kea Obs. (568) | 130 | cubewano? | 43.7 | 0.03 | 2 | 42.5 | 44.9 | — | MPC · JPL |
| 1999 CY$_{118}$ | 10 February 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 70 | SDO | 89.4 | 0.61 | 26 | 34.6 | 144 | — | MPC · JPL |
| 1999 CY$_{131}$ | 11 February 1999 | Mauna Kea Obs. (568) | 100 | other TNO | 43.9 | 0.14 | 25 | 38.0 | 49.9 | — | MPC · JPL |
| 1999 CZ$_{118}$ | 10 February 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 99 | SDO | 116 | 0.68 | 28 | 37.5 | 194 | — | MPC · JPL |
| 1999 CZ$_{131}$ | 11 February 1999 | Mauna Kea Obs. (568) | 82 | cubewano? | 44.4 | 0.03 | 2 | 43.0 | 45.9 | — | MPC · JPL |
| 1999 DA | 16 February 1999 | B. Gladman J. J. Kavelaars A. Morbidelli M. J. Holman (568) | 87 | cubewano (cold) | 43.0 | 0.08 | 3 | 39.8 | 46.3 | — | MPC · JPL |
| 1999 DA$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 16 | plutino? | 39.3 | 0.33 | 40 | 26.4 | 52.2 | — | MPC · JPL |
| 1999 DB$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 42 | other TNO | 42.5 | 0.10 | 22 | 38.2 | 46.8 | — | MPC · JPL |
| 1999 DC$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 34 | cubewano? | 45.9 | 0.00 | 5 | 45.9 | 45.9 | — | MPC · JPL |
| 1999 DD$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 28 | plutino? | 39.4 | 0.23 | 6 | 30.3 | 48.5 | — | MPC · JPL |
| 1999 DE$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 41 | cubewano? | 45.6 | 0.00 | 4 | 45.6 | 45.6 | — | MPC · JPL |
| 1999 DF$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 36 | cubewano? | 44.2 | 0.00 | 3 | 44.2 | 44.2 | — | MPC · JPL |
| 1999 DG$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 91 | SDO | 82.2 | 0.60 | 40 | 33.0 | 131 | — | MPC · JPL |
| 1999 DH$_8$ | 16 February 1999 | B. Gladman J. J. Kavelaars A. Morbidelli M. J. Holman (568) | 60 | cubewano (cold) | 43.8 | 0.07 | 5 | 40.8 | 46.9 | — | MPC · JPL |
| 1999 DL$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 62 | cubewano (hot) | 42.5 | 0.00 | 6 | 42.5 | 42.5 | — | MPC · JPL |
| 1999 DM$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 39 | cubewano? | 42.9 | 0.00 | 4 | 42.9 | 42.9 | — | MPC · JPL |
| 1999 DN$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 38 | cubewano? | 44.3 | 0.00 | 3 | 44.3 | 44.3 | — | MPC · JPL |
| 1999 DO$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 34 | cubewano? | 41.8 | 0.00 | 3 | 41.8 | 41.8 | — | MPC · JPL |
| 1999 DP$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 63 | SDO | 116 | 0.70 | 38 | 34.7 | 197 | — | MPC · JPL |
| 1999 DQ$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 52 | cubewano? | 45.3 | 0.00 | 14 | 45.3 | 45.3 | — | MPC · JPL |
| 1999 DR$_8$ | 16 February 1999 | Mauna Kea Obs. (568) | 47 | cubewano? | 45.5 | 0.11 | 8 | 40.4 | 50.6 | — | MPC · JPL |
| 1999 DZ$_7$ | 16 February 1999 | Mauna Kea Obs. (568) | 82 | plutino? | 39.4 | 0.27 | 14 | 28.9 | 49.9 | — | MPC · JPL |
| 1999 GS$_{46}$ | 12 April 1999 | A. Delsanti O. R. Hainaut (809) | 214 | cubewano (hot) | 44.5 | 0.08 | 5 | 40.9 | 48.2 | BR-mag: 1.76 | MPC · JPL |
| 1999 HA$_{12}$ | 17 April 1999 | Kitt Peak Obs. (695) | 95 | cubewano? | 43.1 | 0.06 | 4 | 40.6 | 45.7 | — | MPC · JPL |
| 1999 HG$_{12}$ | 18 April 1999 | R. Millis M. W. Buie (695) | 131 | res · 4:7 | 43.6 | 0.16 | 1 | 36.7 | 50.5 | BR-mag: 1.61; taxonomy: IR-RR | MPC · JPL |
| 1999 HH$_{12}$ | 18 April 1999 | R. Millis M. W. Buie (695) | 132 | cubewano (cold) | 43.5 | 0.02 | 1 | 42.5 | 44.5 | — | MPC · JPL |
| 1999 HJ$_{12}$ | 18 April 1999 | R. Millis M. W. Buie (695) | 110 | cubewano (cold) | 43.1 | 0.05 | 5 | 40.9 | 45.4 | — | MPC · JPL |
| 1999 HS$_{11}$ | 17 April 1999 | M. W. Buie R. Millis (695) | 139 | cubewano (cold) | 44.1 | 0.02 | 3 | 43.2 | 45.0 | BR-mag: 1.76; taxonomy: RR | MPC · JPL |
| 1999 HY$_{11}$ | 17 April 1999 | Kitt Peak Obs. (695) | 75 | cubewano? | 42.2 | 0.06 | 6 | 39.6 | 44.7 | — | MPC · JPL |
| 1999 HZ$_{11}$ | 17 April 1999 | Kitt Peak Obs. (695) | 72 | cubewano? | 42.4 | 0.08 | 10 | 39.0 | 45.7 | — | MPC · JPL |
| 1999 JA$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 99 | cubewano? | 44.6 | 0.00 | 7 | 44.5 | 44.6 | — | MPC · JPL |
| 1999 JB$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 108 | plutino? | 39.5 | 0.28 | 13 | 28.7 | 50.4 | — | MPC · JPL |
| 1999 JC$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 86 | plutino? | 39.5 | 0.24 | 6 | 29.9 | 49.2 | — | MPC · JPL |
| 1999 JD$_{132}$ | 10 May 1999 | R. L. Allen G. Bernstein P. Guhathakurta (807) | 148 | cubewano (hot) | 43.3 | 0.06 | 11 | 40.5 | 46.0 | BR-mag: 1.59 | MPC · JPL |
| 1999 JE$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 90 | plutino? | 39.4 | 0.20 | 25 | 31.8 | 47.1 | — | MPC · JPL |
| 1999 JF$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 90 | cubewano? | 44.5 | 0.00 | 2 | 44.5 | 44.5 | — | MPC · JPL |
| 1999 JH$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 41 | cubewano? | 42.0 | 0.00 | 1 | 42.0 | 42.0 | — | MPC · JPL |
| 1999 JJ$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 45.8 | 0.10 | 3 | 41.1 | 50.5 | — | MPC · JPL |
| 1999 JK$_{132}$ | 10 May 1999 | Cerro Tololo Obs. (807) | 68 | plutino? | 39.3 | 0.17 | 16 | 32.8 | 45.9 | — | MPC · JPL |
| 1999 KK$_{17}$ | 18 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 45.5 | 0.00 | 4 | 45.5 | 45.5 | — | MPC · JPL |
| 1999 KL$_{17}$ | 18 May 1999 | Cerro Tololo Obs. (807) | 62 | cubewano? | 46.2 | 0.03 | 3 | 44.9 | 47.6 | — | MPC · JPL |
| 1999 KR$_{18}$ | 18 May 1999 | R. L. Allen G. Bernstein P. Guhathakurta (807) | 95 | res · 4:7 | 43.9 | 0.20 | 1 | 35.1 | 52.7 | — | MPC · JPL |
| 1999 KT$_{16}$ | 18 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 46.4 | 0.00 | 9 | 46.4 | 46.4 | — | MPC · JPL |
| 1999 LB$_{37}$ | 8 June 1999 | Palomar Obs. (675) | 57 | plutino? | 39.5 | 0.19 | 15 | 31.9 | 47.1 | — | MPC · JPL |
| 1999 OA$_4$ | 21 July 1999 | J. J. Kavelaars B. Gladman M. J. Holman J.-M. Petit (568) | 87 | cubewano (cold) | 44.8 | 0.06 | 3 | 42.0 | 47.5 | — | MPC · JPL |
| 1999 OC$_4$ | 18 July 1999 | Mauna Kea Obs. (568) | 73 | cubewano (cold) | 45.9 | 0.17 | 1 | 38.0 | 53.8 | — | MPC · JPL |
| 1999 OD$_4$ | 19 July 1999 | Mauna Kea Obs. (568) | 124 | cubewano? | 41.8 | 0.09 | 14 | 37.9 | 45.6 | — | MPC · JPL |
| 1999 OG$_4$ | 20 July 1999 | Mauna Kea Obs. (568) | 96 | cubewano (cold) | 47.4 | 0.13 | 1 | 41.3 | 53.5 | — | MPC · JPL |
| 1999 OH$_4$ | 18 July 1999 | Mauna Kea Obs. (568) | 91 | other TNO | 40.8 | 0.04 | 28 | 39.0 | 42.6 | BR-mag: 3.20 | MPC · JPL |
| 1999 OK$_4$ | 19 July 1999 | Mauna Kea Obs. (568) | 126 | other TNO | 43.5 | 0.15 | 30 | 36.9 | 50.2 | — | MPC · JPL |
| 1999 OZ$_3$ | 21 July 1999 | J. J. Kavelaars B. Gladman M. J. Holman J.-M. Petit (568) | 110 | cubewano (cold) | 44.4 | 0.08 | 3 | 40.7 | 48.1 | — | MPC · JPL |
| 1999 RB$_{215}$ | 6 September 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 48 | twotino | 47.9 | 0.34 | 8 | 31.4 | 64.5 | — | MPC · JPL |
| 1999 RC$_{216}$ | 8 September 1999 | Mauna Kea Obs. (568) | 119 | cubewano? | 44.4 | 0.08 | 1 | 40.8 | 48.0 | — | MPC · JPL |
| 1999 RF$_{215}$ | 7 September 1999 | Mauna Kea Obs. (568) | 114 | cubewano? | 44.0 | 0.00 | 4 | 44.0 | 44.0 | — | MPC · JPL |
| 1999 RG$_{215}$ | 7 September 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 120 | cubewano (cold) | 46.8 | 0.08 | 0 | 43.2 | 50.4 | — | MPC · JPL |
| 1999 RK$_{257}$ | 12 September 1999 | Mauna Kea Obs. (568) | 91 | other TNO | 43.2 | 0.05 | 18 | 41.0 | 45.4 | — | MPC · JPL |
| 1999 RR$_{215}$ | 7 September 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 80 | cubewano (cold) | 44.3 | 0.11 | 1 | 39.7 | 49.0 | — | MPC · JPL |
| 1999 RS$_{214}$ | 6 September 1999 | Mauna Kea Obs. (568) | 90 | cubewano? | 43.0 | 0.00 | 3 | 43.0 | 43.0 | — | MPC · JPL |
| 1999 RT$_{214}$ | 6 September 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 100 | cubewano (cold) | 42.9 | 0.06 | 3 | 40.6 | 45.3 | albedo: 0.210; binary: 69 km | MPC · JPL |
| 1999 RT$_{215}$ | 7 September 1999 | Mauna Kea Obs. (568) | 158 | other TNO | 43.1 | 0.00 | 22 | 43.1 | 43.1 | — | MPC · JPL |
| 1999 RU$_{214}$ | 6 September 1999 | C. Trujillo D. C. Jewitt J. X. Luu (568) | 146 | res · 2:5 | 56.2 | 0.34 | 4 | 37.0 | 75.4 | — | MPC · JPL |
| 1999 RV$_{214}$ | 6 September 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 87 | cubewano (cold) | 46.8 | 0.05 | 1 | 44.6 | 49.0 | — | MPC · JPL |
| 1999 RV$_{215}$ | 7 September 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 87 | other TNO | 44.8 | 0.19 | 22 | 36.4 | 53.2 | — | MPC · JPL |
| 1999 RW$_{214}$ | 6 September 1999 | J. X. Luu C. Trujillo D. C. Jewitt (568) | 115 | cubewano (cold) | 43.2 | 0.03 | 1 | 41.8 | 44.6 | — | MPC · JPL |
| 1999 RW$_{215}$ | 7 September 1999 | J. X. Luu D. C. Jewitt C. Trujillo (568) | 93 | res · 3:4 | 36.4 | 0.16 | 11 | 30.7 | 42.2 | — | MPC · JPL |
| 1999 RX$_{214}$ | 6 September 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 145 | cubewano (cold) | 46.4 | 0.17 | 5 | 38.4 | 54.4 | BR-mag: 1.63; taxonomy: IR | MPC · JPL |
| 1999 RX$_{215}$ | 8 September 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 100 | cubewano (cold) | 47.4 | 0.15 | 1 | 40.5 | 54.3 | — | MPC · JPL |
| 1999 RZ$_{214}$ | 6 September 1999 | C. Trujillo J. X. Luu D. C. Jewitt (568) | 104 | SDO | 86.1 | 0.57 | 21 | 36.7 | 136 | — | MPC · JPL |
| 1999 SA$_{28}$ | 16 September 1999 | Mauna Kea Obs. (568) | 164 | plutino? | 39.2 | 0.18 | 11 | 32.0 | 46.5 | — | MPC · JPL |
| 1999 TR11 | 9 October 1999 | S. S. Sheppard (568) | 99 | plutino | 39.3 | 0.25 | 17 | 29.7 | 49.0 | BR-mag: 1.77; taxonomy: RR | MPC · JPL |