List of unnumbered trans-Neptunian objects: 1999
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The following is a partial list of unnumbered trans-Neptunian objects for principal designations assigned within 1999. As of October 2025[update], it contains a total of 93 bodies.[1][2][3][4] For more information see the description on the main page. Also see list for the previous and next year.
1999
| Designation | First Observed (discovered) | D (km) | Orbital description | Remarks | Refs | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Date | Observer (Site) |
Class | a (AU) |
e | i (°) |
q (AU) |
Q (AU) | ||||
| 1999 CA119 | 10 February 1999 | Mauna Kea Obs. (568) | 99 | cubewano? | 45.2 | 0.00 | 0 | 45.2 | 45.2 | — | MPC · JPL |
| 1999 CA132 | 11 February 1999 | Mauna Kea Obs. (568) | 114 | cubewano? | 44.0 | 0.10 | 12 | 39.7 | 48.3 | — | MPC · JPL |
| 1999 CB119 | 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 CC119 | 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 CD119 | 10 February 1999 | Mauna Kea Obs. (568) | 119 | cubewano? | 44.0 | 0.03 | 2 | 42.8 | 45.2 | — | MPC · JPL |
| 1999 CG154 | 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 CH119 | 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 CH154 | 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 CJ119 | 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 CK119 | 11 February 1999 | Mauna Kea Obs. (568) | 90 | cubewano? | 42.1 | 0.00 | 12 | 42.1 | 42.1 | — | MPC · JPL |
| 1999 CK158 | 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 CM119 | 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 CM153 | 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 CN119 | 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 CN153 | 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 CP153 | 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 CQ133 | 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 CQ153 | 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 CR133 | 12 February 1999 | Mauna Kea Obs. (568) | 82 | cubewano? | 42.2 | 0.00 | 2 | 42.2 | 42.2 | — | MPC · JPL |
| 1999 CR153 | 11 February 1999 | Mauna Kea Obs. (568) | 79 | cubewano? | 43.1 | 0.05 | 1 | 40.9 | 45.3 | — | MPC · JPL |
| 1999 CS153 | 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 CT153 | 11 February 1999 | Mauna Kea Obs. (568) | 82 | cubewano? | 45.1 | 0.09 | 5 | 40.9 | 49.3 | — | MPC · JPL |
| 1999 CW118 | 10 February 1999 | Mauna Kea Obs. (568) | 95 | cubewano? | 43.5 | 0.00 | 1 | 43.5 | 43.5 | — | MPC · JPL |
| 1999 CW131 | 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 CX118 | 10 February 1999 | Mauna Kea Obs. (568) | 130 | cubewano? | 43.7 | 0.03 | 2 | 42.5 | 44.9 | — | MPC · JPL |
| 1999 CY118 | 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 CY131 | 11 February 1999 | Mauna Kea Obs. (568) | 100 | other TNO | 43.9 | 0.14 | 25 | 38.0 | 49.9 | — | MPC · JPL |
| 1999 CZ118 | 10 February 1999 | D. C. Jewitt C. Trujillo J. X. Luu (568) | 99 | SDO | 116 | 0.68 | 28 | 37.5 | 194 | — | MPC · JPL |
| 1999 CZ131 | 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 DB8 | 16 February 1999 | Mauna Kea Obs. (568) | 42 | other TNO | 42.5 | 0.10 | 22 | 38.2 | 46.8 | — | MPC · JPL |
| 1999 DC8 | 16 February 1999 | Mauna Kea Obs. (568) | 34 | cubewano? | 45.9 | 0.00 | 5 | 45.9 | 45.9 | — | MPC · JPL |
| 1999 DD8 | 16 February 1999 | Mauna Kea Obs. (568) | 28 | plutino? | 39.4 | 0.23 | 6 | 30.3 | 48.5 | — | MPC · JPL |
| 1999 DE8 | 16 February 1999 | Mauna Kea Obs. (568) | 41 | cubewano? | 45.6 | 0.00 | 4 | 45.6 | 45.6 | — | MPC · JPL |
| 1999 DF8 | 16 February 1999 | Mauna Kea Obs. (568) | 36 | cubewano? | 44.2 | 0.00 | 3 | 44.2 | 44.2 | — | MPC · JPL |
| 1999 DG8 | 16 February 1999 | Mauna Kea Obs. (568) | 91 | SDO | 82.2 | 0.60 | 40 | 33.0 | 131 | — | MPC · JPL |
| 1999 DH8 | 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 DL8 | 16 February 1999 | Mauna Kea Obs. (568) | 62 | cubewano (hot) | 42.5 | 0.00 | 6 | 42.5 | 42.5 | — | MPC · JPL |
| 1999 DM8 | 16 February 1999 | Mauna Kea Obs. (568) | 39 | cubewano? | 42.9 | 0.00 | 4 | 42.9 | 42.9 | — | MPC · JPL |
| 1999 DN8 | 16 February 1999 | Mauna Kea Obs. (568) | 38 | cubewano? | 44.3 | 0.00 | 3 | 44.3 | 44.3 | — | MPC · JPL |
| 1999 DO8 | 16 February 1999 | Mauna Kea Obs. (568) | 34 | cubewano? | 41.8 | 0.00 | 3 | 41.8 | 41.8 | — | MPC · JPL |
| 1999 DP8 | 16 February 1999 | Mauna Kea Obs. (568) | 63 | SDO | 116 | 0.70 | 38 | 34.7 | 197 | — | MPC · JPL |
| 1999 DQ8 | 16 February 1999 | Mauna Kea Obs. (568) | 52 | cubewano? | 45.3 | 0.00 | 14 | 45.3 | 45.3 | — | MPC · JPL |
| 1999 DR8 | 16 February 1999 | Mauna Kea Obs. (568) | 47 | cubewano? | 45.5 | 0.11 | 8 | 40.4 | 50.6 | — | MPC · JPL |
| 1999 DZ7 | 16 February 1999 | Mauna Kea Obs. (568) | 82 | plutino? | 39.4 | 0.27 | 14 | 28.9 | 49.9 | — | MPC · JPL |
| 1999 GS46 | 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 HA12 | 17 April 1999 | Kitt Peak Obs. (695) | 95 | cubewano? | 43.1 | 0.06 | 4 | 40.6 | 45.7 | — | MPC · JPL |
| 1999 HG12 | 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 HH12 | 18 April 1999 | R. Millis M. W. Buie (695) | 132 | cubewano (cold) | 43.5 | 0.02 | 1 | 42.5 | 44.5 | — | MPC · JPL |
| 1999 HJ12 | 18 April 1999 | R. Millis M. W. Buie (695) | 110 | cubewano (cold) | 43.1 | 0.05 | 5 | 40.9 | 45.4 | — | MPC · JPL |
| 1999 HS11 | 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 HY11 | 17 April 1999 | Kitt Peak Obs. (695) | 75 | cubewano? | 42.2 | 0.06 | 6 | 39.6 | 44.7 | — | MPC · JPL |
| 1999 HZ11 | 17 April 1999 | Kitt Peak Obs. (695) | 72 | cubewano? | 42.4 | 0.08 | 10 | 39.0 | 45.7 | — | MPC · JPL |
| 1999 JA132 | 10 May 1999 | Cerro Tololo Obs. (807) | 99 | cubewano? | 44.6 | 0.00 | 7 | 44.5 | 44.6 | — | MPC · JPL |
| 1999 JB132 | 10 May 1999 | Cerro Tololo Obs. (807) | 108 | plutino? | 39.5 | 0.28 | 13 | 28.7 | 50.4 | — | MPC · JPL |
| 1999 JC132 | 10 May 1999 | Cerro Tololo Obs. (807) | 86 | plutino? | 39.5 | 0.24 | 6 | 29.9 | 49.2 | — | MPC · JPL |
| 1999 JD132 | 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 JE132 | 10 May 1999 | Cerro Tololo Obs. (807) | 90 | plutino? | 39.4 | 0.20 | 25 | 31.8 | 47.1 | — | MPC · JPL |
| 1999 JF132 | 10 May 1999 | Cerro Tololo Obs. (807) | 90 | cubewano? | 44.5 | 0.00 | 2 | 44.5 | 44.5 | — | MPC · JPL |
| 1999 JH132 | 10 May 1999 | Cerro Tololo Obs. (807) | 41 | cubewano? | 42.0 | 0.00 | 1 | 42.0 | 42.0 | — | MPC · JPL |
| 1999 JJ132 | 10 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 45.8 | 0.10 | 3 | 41.1 | 50.5 | — | MPC · JPL |
| 1999 JK132 | 10 May 1999 | Cerro Tololo Obs. (807) | 68 | plutino? | 39.3 | 0.17 | 16 | 32.8 | 45.9 | — | MPC · JPL |
| 1999 KK17 | 18 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 45.5 | 0.00 | 4 | 45.5 | 45.5 | — | MPC · JPL |
| 1999 KL17 | 18 May 1999 | Cerro Tololo Obs. (807) | 62 | cubewano? | 46.2 | 0.03 | 3 | 44.9 | 47.6 | — | MPC · JPL |
| 1999 KR18 | 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 KT16 | 18 May 1999 | Cerro Tololo Obs. (807) | 60 | cubewano? | 46.4 | 0.00 | 9 | 46.4 | 46.4 | — | MPC · JPL |
| 1999 LB37 | 8 June 1999 | Palomar Obs. (675) | 57 | plutino? | 39.5 | 0.19 | 15 | 31.9 | 47.1 | — | MPC · JPL |
| 1999 OA4 | 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 OC4 | 18 July 1999 | Mauna Kea Obs. (568) | 73 | cubewano (cold) | 45.9 | 0.17 | 1 | 38.0 | 53.8 | — | MPC · JPL |
| 1999 OD4 | 19 July 1999 | Mauna Kea Obs. (568) | 124 | cubewano? | 41.8 | 0.09 | 14 | 37.9 | 45.6 | — | MPC · JPL |
| 1999 OG4 | 20 July 1999 | Mauna Kea Obs. (568) | 96 | cubewano (cold) | 47.4 | 0.13 | 1 | 41.3 | 53.5 | — | MPC · JPL |
| 1999 OH4 | 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 OK4 | 19 July 1999 | Mauna Kea Obs. (568) | 126 | other TNO | 43.5 | 0.15 | 30 | 36.9 | 50.2 | — | MPC · JPL |
| 1999 OZ3 | 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 RB215 | 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 RC216 | 8 September 1999 | Mauna Kea Obs. (568) | 119 | cubewano? | 44.4 | 0.08 | 1 | 40.8 | 48.0 | — | MPC · JPL |
| 1999 RF215 | 7 September 1999 | Mauna Kea Obs. (568) | 114 | cubewano? | 44.0 | 0.00 | 4 | 44.0 | 44.0 | — | MPC · JPL |
| 1999 RG215 | 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 RK257 | 12 September 1999 | Mauna Kea Obs. (568) | 91 | other TNO | 43.2 | 0.05 | 18 | 41.0 | 45.4 | — | MPC · JPL |
| 1999 RR215 | 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 RS214 | 6 September 1999 | Mauna Kea Obs. (568) | 90 | cubewano? | 43.0 | 0.00 | 3 | 43.0 | 43.0 | — | MPC · JPL |
| 1999 RT214 | 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 RT215 | 7 September 1999 | Mauna Kea Obs. (568) | 158 | other TNO | 43.1 | 0.00 | 22 | 43.1 | 43.1 | — | MPC · JPL |
| 1999 RU214 | 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 RV214 | 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 RV215 | 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 RW214 | 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 RW215 | 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 RX214 | 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 RX215 | 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 RZ214 | 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 SA28 | 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 |
