IAA Minor Planet Database| Epoch (TDB) | 2025-11-21 (JD 2461000.5) |
|---|---|
| Eccentricity (e) | 0.6415366209 ± 2.36e-09 |
| Semi-major axis (a) | 2.7239591426 AU ± 3.38e-09 |
| Inclination (i) | 13.83939906° ± 7.44e-07 |
| Long. of Asc. Node (Ω) | 133.62545012° ± 1.75e-06 |
| Arg. of Perihelion (ω) | 166.78539540° ± 4.11e-06 |
| Mean Anomaly (M) | 316.52624905° ± 2.49e-06 |
| Mean Motion (n) | 0.2192357591°/day ± 4.08e-10 |
| Perihelion dist (q) | 0.97643960 AU ± 6.55e-09 |
| Aphelion dist (Q) | 4.47147869 AU ± 8.50e-09 |
| Orbital Period | 4.49573686 yr ± 8.37e-09 |
| H (abs. magnitude) | 15.35 |
|---|---|
| G (slope) | 0.15 |
1990 HD1
| Source | IAA |
|---|---|
| Solution Date | 2026-05-31 |
| RMS Residual | 0.109″ |
| Uncertainty | 0 |
| Orbit Type | Apollo |
| MOID | 0.026857 AU |
| Observations Used | 1289 |
| Radar Obs Used | 61 |
| Gaia Obs Used | 38 |
| Oppositions | 21 |
| Arc Total | 1990-2025 |
| First Observation Used | 1990-04-27 |
| Last Observation Used | 2025-12-10 |
| Date | Type | RA | Dec | Mag | Band | Observatory |
|---|---|---|---|---|---|---|
| 1999-07-19 20:27:57 | C | 12 15 05.62 | +60 55 10.8 | – | z | 151 |
| 1999-07-19 20:33:58 | C | 12 15 01.23 | +60 55 29.7 | – | z | 151 |
| 1999-07-19 20:38:23 | C | 12 14 57.96 | +60 55 44.0 | – | z | 151 |
| 1999-07-20 23:24:12 | C | 11 52 48.60 | +62 25 11.5 | – | – | 557 |
| 1999-07-20 23:25:11 | C | 11 52 47.69 | +62 25 14.7 | – | – | 557 |
| 1999-07-20 23:30:16 | C | 11 52 43.06 | +62 25 30.5 | – | – | 557 |
| 1999-07-20 23:31:18 | C | 11 52 42.12 | +62 25 33.6 | – | – | 557 |
| 1999-07-21 21:57:15 | C | 11 29 22.83 | +63 37 38.2 | – | – | 557 |
| 1999-07-21 21:59:16 | C | 11 29 20.54 | +63 37 43.8 | – | – | 557 |
| 1999-07-21 22:04:22 | C | 11 29 14.73 | +63 37 58.1 | – | – | 557 |
| 1999-07-22 20:50:20 | C | 11 00 12.28 | +64 40 43.3 | – | z | 151 |
| 1999-07-22 20:55:40 | C | 11 00 04.81 | +64 40 54.6 | – | z | 151 |
| 1999-07-22 20:58:50 | C | 11 00 00.36 | +64 41 01.3 | – | z | 151 |
| 1999-07-22 21:00:42 | C | 10 59 57.78 | +64 41 04.9 | – | z | 151 |
| 1999-07-23 05:24:28 | C | 10 47 43.12 | +64 59 37.3 | – | – | 848 |
| 1999-07-23 05:25:15 | C | 10 47 42.09 | +64 59 38.5 | – | – | 848 |
| 1999-07-23 05:25:59 | C | 10 47 40.94 | +64 59 39.8 | – | – | 848 |
| 1999-07-24 20:20:46 | C | 09 40 30.34 | +65 29 07.4 | – | z | 151 |
| 1999-07-24 20:28:32 | C | 09 40 15.42 | +65 28 58.9 | – | z | 151 |
| 1999-07-24 20:30:19 | C | 09 40 12.24 | +65 28 57.0 | – | z | 151 |
| 1999-07-24 20:37:06 | C | 09 39 59.21 | +65 28 48.6 | – | z | 151 |
| 1999-07-25 20:22:26 | C | 08 52 47.43 | +64 38 45.2 | – | z | 151 |
| 1999-07-25 20:24:51 | C | 08 52 42.54 | +64 38 34.7 | – | z | 151 |
| 1999-07-25 20:28:33 | C | 08 52 35.13 | +64 38 21.9 | – | z | 151 |
| 1999-07-25 20:30:47 | C | 08 52 30.78 | +64 38 13.0 | – | z | 151 |
| 1999-07-25 20:34:20 | C | 08 52 23.70 | +64 38 00.2 | – | z | 151 |
| 1999-08-03 00:49:26 | C | 04 53 43.19 | +25 47 51.0 | – | z | 151 |
| 1999-08-03 00:56:19 | C | 04 53 39.89 | +25 46 20.1 | – | z | 151 |
| 1999-08-03 01:07:51 | C | 04 53 34.33 | +25 43 50.0 | – | z | 151 |
| 1999-08-15 16:43:38 | C | 03 49 49.42 | -10 02 36.0 | – | – | 422 |
| 1999-08-15 16:44:34 | C | 03 49 49.33 | -10 02 39.0 | – | – | 422 |
| 1999-08-15 16:45:14 | C | 03 49 49.26 | -10 02 41.4 | – | – | 422 |
| 1999-08-16 00:47:30 | C | 03 49 04.90 | -10 29 41.2 | – | – | 121 |
| 1999-08-16 00:51:29 | C | 03 49 04.50 | -10 29 53.7 | – | – | 121 |
| 1999-08-16 00:55:29 | C | 03 49 04.11 | -10 30 06.4 | – | – | 121 |
| 1999-08-19 18:14:54 | C | 03 42 05.70 | -14 27 01.6 | – | z | 428 |
| 1999-08-19 18:16:24 | C | 03 42 05.55 | -14 27 05.2 | – | z | 428 |
| 1999-08-19 18:17:53 | C | 03 42 05.44 | -14 27 08.6 | – | z | 428 |
| 1999-08-19 18:19:29 | C | 03 42 05.33 | -14 27 12.2 | – | z | 428 |
| 1999-08-22 01:23:18 | C | 03 38 29.24 | -16 22 33.0 | – | z | 151 |
| 1999-08-22 01:28:33 | C | 03 38 28.72 | -16 22 43.6 | – | z | 151 |
| 1999-08-22 01:33:27 | C | 03 38 28.42 | -16 22 53.0 | – | z | 151 |
| 1999-08-22 18:22:24 | C | 03 37 25.76 | -16 54 00.0 | – | z | 402 |
| 1999-08-22 18:24:12 | C | 03 37 25.63 | -16 54 03.3 | – | z | 402 |
| 1999-08-22 18:26:01 | C | 03 37 25.50 | -16 54 06.7 | – | z | 402 |
| 1999-08-25 01:13:38 | C | 03 34 10.95 | -18 25 55.2 | – | – | 121 |
| 1999-08-25 01:18:07 | C | 03 34 10.66 | -18 26 02.3 | – | – | 121 |
| 1999-08-25 01:22:06 | C | 03 34 10.40 | -18 26 08.7 | – | – | 121 |
| 1999-09-03 11:01:57 | C | 03 21 39.157 | -22 53 51.70 | – | l | 673 |
| 1999-09-03 11:13:08 | C | 03 21 38.406 | -22 54 02.17 | – | l | 673 |
| Epoch (UTC) | Value | Sigma | Units | Freq (MHz) | Receiver | Transmitter |
|---|---|---|---|---|---|---|
| 1999-07-18 21:30:00 | 580912.511 | 0.25 | Hz | 8560 | -14 | -14 |
| 1999-07-19 02:00:00 | 566126.916 | 0.25 | Hz | 8560 | -14 | -14 |
| 1999-07-20 02:30:00 | 547776.718 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-20 02:50:00 | 546793.21 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-07-21 17:40:00 | 528308.379 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-21 18:20:00 | 83757463.53 | 1.5 | us | 8560 | -14 | -14 |
| 1999-07-21 18:20:00 | 527307.055 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-07-23 00:40:00 | 475428.166 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-23 01:20:00 | 473106.036 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-07-24 17:00:00 | 420950.68 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-24 18:30:00 | 69514032.67 | 1.5 | us | 8560 | -14 | -14 |
| 1999-07-24 18:30:00 | 415857.814 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-07-24 19:30:00 | 69339970.64 | 1.5 | us | 8560 | -14 | -14 |
| 1999-07-24 19:30:00 | 411834.668 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-07-27 01:30:00 | 264385.859 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-27 02:20:00 | 61419497.12 | 1 | us | 8560 | -14 | -14 |
| 1999-07-27 02:20:00 | 262192.676 | 0.25 | Hz | 8560 | -14 | -14 |
| 1999-07-28 17:10:00 | 150647.08 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-28 18:40:00 | 57849240.61 | 1 | us | 8560 | -14 | -14 |
| 1999-07-28 18:40:00 | 140398.678 | 0.25 | Hz | 8560 | -14 | -14 |
| 1999-07-31 17:00:00 | -115965.979 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-07-31 19:30:00 | 57566121.29 | 1 | us | 8560 | -14 | -14 |
| 1999-07-31 19:30:00 | -135124.045 | 0.25 | Hz | 8560 | -14 | -14 |
| 1999-08-01 12:00:00 | -163434.49 | 0.5 | Hz | 8560 | -14 | -14 |
| 1999-08-01 13:00:00 | 58699578.17 | 1 | us | 8560 | -14 | -14 |
| 1999-08-01 13:20:00 | 58716453.68 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-01 13:20:00 | -51647.361 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-01 13:50:00 | 58759820.31 | 1 | us | 8560 | -14 | -14 |
| 1999-08-02 13:30:00 | 60978578.03 | 1 | us | 2380 | -1 | -1 |
| 1999-08-02 13:30:00 | -73358.825 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-03 13:20:00 | 63910961.67 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-03 13:20:00 | -91544.639 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-04 13:30:00 | 67496417.05 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-04 13:30:00 | -107708.209 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-05 12:40:00 | 71416546.18 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-05 12:40:00 | -118977.568 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-06 12:50:00 | 75926730.74 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-06 12:50:00 | -130189.031 | 0.05 | Hz | 2380 | -1 | -1 |
| 1999-08-07 17:40:00 | 81769055.04 | 1.5 | us | 8560 | -14 | -14 |
| 1999-08-07 17:40:00 | -512022.813 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-08-08 14:00:00 | 86112562.88 | 1.5 | us | 8560 | -14 | -14 |
| 1999-08-08 14:00:00 | -513572.349 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-08-08 19:00:00 | 87225305.13 | 1.5 | us | 8560 | -14 | -14 |
| 1999-08-08 19:00:00 | -542275.126 | 0.3 | Hz | 8560 | -14 | -14 |
| 1999-08-09 11:20:00 | 90841551.93 | 0.5 | us | 2380 | -1 | -1 |
| 1999-08-09 11:20:00 | -148932.797 | 0.05 | Hz | 2380 | -1 | -1 |
| 2008-05-29 09:20:00 | 12594.078 | 0.1 | Hz | 2380 | -1 | -1 |
| 2008-05-29 10:30:00 | 315046630.94 | 1 | us | 2380 | -1 | -1 |
| 2008-05-29 10:30:00 | 10369.278 | 0.1 | Hz | 2380 | -1 | -1 |
| 2008-05-30 09:00:00 | 5551.355 | 0.2 | Hz | 2380 | -1 | -1 |
| 2008-05-30 10:20:00 | 314782127.18 | 1 | us | 2380 | -1 | -1 |
| 2008-05-30 10:20:00 | 3023.025 | 0.1 | Hz | 2380 | -1 | -1 |
| 2008-05-31 09:10:00 | -2381.041 | 0.2 | Hz | 2380 | -1 | -1 |
| 2008-05-31 10:20:00 | 314797235.75 | 1.5 | us | 2380 | -1 | -1 |
| 2008-05-31 10:20:00 | -4594.449 | 0.1 | Hz | 2380 | -1 | -1 |
| 2008-06-01 09:00:00 | -9636.645 | 0.2 | Hz | 2380 | -1 | -1 |
| 2008-06-01 10:20:00 | 315092662 | 1.5 | us | 2380 | -1 | -1 |
| 2008-06-01 10:20:00 | -12151.259 | 0.1 | Hz | 2380 | -1 | -1 |
| 2008-06-02 09:10:00 | -17431.599 | 0.2 | Hz | 2380 | -1 | -1 |
| 2008-06-02 10:30:00 | 315670902.49 | 1.5 | us | 2380 | -1 | -1 |
| 2008-06-02 10:30:00 | -19951.241 | 0.1 | Hz | 2380 | -1 | -1 |