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 |
|---|---|---|---|---|---|---|
| 1999-07-14 21:22:27 | C | 13 10 23.39 | +54 56 17.8 | – | – | 557 |
| 1999-07-14 21:24:08 | C | 13 10 22.89 | +54 56 21.8 | – | – | 557 |
| 1999-07-14 21:25:51 | C | 13 10 22.39 | +54 56 25.8 | – | – | 557 |
| 1999-07-14 21:29:06 | C | 13 10 21.31 | +54 56 50.6 | – | – | 952 |
| 1999-07-14 21:31:14 | C | 13 10 20.65 | +54 56 55.6 | – | – | 952 |
| 1999-07-14 21:33:21 | C | 13 10 20.01 | +54 57 00.4 | – | – | 952 |
| 1999-07-15 11:37:52 | C | 13 06 06.63 | +55 33 44.2 | – | z | 402 |
| 1999-07-15 11:39:40 | C | 13 06 06.03 | +55 33 48.8 | – | z | 402 |
| 1999-07-15 11:41:29 | C | 13 06 05.41 | +55 33 53.3 | – | z | 402 |
| 1999-07-15 20:32:33 | C | 13 03 12.75 | +55 57 20.1 | – | – | 557 |
| 1999-07-15 20:34:09 | C | 13 03 12.21 | +55 57 24.1 | – | – | 557 |
| 1999-07-15 20:35:45 | C | 13 03 11.65 | +55 57 28.3 | – | – | 557 |
| 1999-07-15 21:45:59 | C | 13 02 47.68 | +56 00 33.8 | – | c | 636 |
| 1999-07-15 21:51:29 | C | 13 02 45.82 | +56 00 48.4 | – | c | 636 |
| 1999-07-15 21:55:45 | C | 13 02 44.35 | +56 00 59.4 | – | c | 636 |
| 1999-07-15 22:56:03 | C | 13 02 22.73 | +56 03 24.5 | 14.6 | z | 071 |
| 1999-07-15 22:59:33 | C | 13 02 21.55 | +56 03 33.2 | 14.5 | z | 071 |
| 1999-07-15 23:03:17 | C | 13 02 20.33 | +56 03 43.2 | 14.6 | z | 071 |
| 1999-07-15 23:05:00 | C | 13 02 19.72 | +56 03 47.4 | 14.5 | z | 071 |
| 1999-07-15 23:06:42 | C | 13 02 19.19 | +56 03 51.9 | 14.5 | z | 071 |
| 1999-07-16 00:00:00 | C | 13 02 01.73 | +56 06 19.3 | – | c | 636 |
| 1999-07-16 20:43:20 | C | 12 54 18.54 | +57 05 50.3 | – | z | 151 |
| 1999-07-16 20:46:30 | C | 12 54 17.18 | +57 05 59.1 | – | z | 151 |
| 1999-07-16 20:49:04 | C | 12 54 16.14 | +57 06 06.3 | – | z | 151 |
| 1999-07-16 22:18:14 | C | 12 53 39.81 | +57 10 12.0 | – | c | 636 |
| 1999-07-16 22:22:35 | C | 12 53 38.03 | +57 10 24.1 | – | c | 636 |
| 1999-07-16 22:26:44 | C | 12 53 36.36 | +57 10 35.5 | – | c | 636 |
| 1999-07-16 22:31:04 | C | 12 53 34.59 | +57 10 47.5 | – | c | 636 |
| 1999-07-16 22:33:59 | C | 12 53 33.17 | +57 10 49.3 | – | – | 557 |
| 1999-07-16 22:43:24 | C | 12 53 29.34 | +57 11 15.4 | – | – | 557 |
| 1999-07-16 22:49:08 | C | 12 53 27.01 | +57 11 31.2 | – | – | 557 |
| 1999-07-17 20:26:44 | C | 12 43 49.11 | +58 17 46.6 | – | z | 151 |
| 1999-07-17 20:30:00 | C | 12 43 47.26 | +58 17 49.2 | – | c | 118 |
| 1999-07-17 20:34:18 | C | 12 43 45.13 | +58 18 01.9 | – | c | 118 |
| 1999-07-17 20:35:05 | C | 12 43 44.97 | +58 18 05.0 | – | – | 557 |
| 1999-07-17 20:36:53 | C | 12 43 43.97 | +58 18 16.6 | – | z | 151 |
| 1999-07-17 20:39:20 | C | 12 43 41.53 | +58 18 15.0 | – | z | 071 |
| 1999-07-17 20:40:03 | C | 12 43 42.46 | +58 18 26.7 | – | z | 151 |
| 1999-07-17 20:41:59 | C | 12 43 41.32 | +58 18 24.3 | – | c | 118 |
| 1999-07-17 20:42:12 | C | 12 43 40.16 | +58 18 23.4 | – | z | 071 |
| 1999-07-17 20:43:56 | C | 12 43 39.37 | +58 18 28.1 | – | z | 071 |
| 1999-07-17 20:45:42 | C | 12 43 38.44 | +58 18 33.7 | – | z | 071 |
| 1999-07-17 20:46:16 | C | 12 43 39.18 | +58 18 37.0 | – | c | 118 |
| 1999-07-17 21:09:24 | C | 12 43 27.97 | +58 19 46.0 | – | – | 557 |
| 1999-07-17 22:09:40 | C | 12 42 58.20 | +58 22 43.0 | – | – | 557 |
| 1999-07-17 22:42:04 | C | 12 42 42.31 | +58 24 18.2 | – | – | 557 |
| 1999-07-18 20:37:34 | C | 12 30 49.50 | +59 35 18.4 | – | – | 557 |
| 1999-07-18 20:48:13 | C | 12 30 43.08 | +59 35 51.1 | – | – | 557 |
| 1999-07-18 22:00:33 | C | 12 29 59.63 | +59 39 34.1 | – | – | 557 |
| 1999-07-19 20:22:36 | C | 12 15 09.62 | +60 54 54.6 | – | z | 151 |
| 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 |