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 |
|---|---|---|---|---|---|---|
| 2018-02-05 04:11:59 | C | 03 19 57.26 | +04 20 51.0 | – | U | G96 |
| 2018-02-05 04:19:25 | C | 03 19 57.49 | +04 20 53.9 | – | U | G96 |
| 2020-01-23 09:01:46 | C | 08 52 20.040 | +16 05 44.82 | – | U | F51 |
| 2020-01-23 09:17:21 | C | 08 52 19.494 | +16 05 47.61 | – | U | F51 |
| 2020-01-23 09:32:53 | C | 08 52 18.965 | +16 05 50.67 | – | U | F51 |
| 2020-01-23 09:48:25 | C | 08 52 18.421 | +16 05 53.51 | – | U | F51 |
| 2020-01-25 08:07:43 | C | 08 50 43.48 | +16 14 33.6 | – | V | G96 |
| 2020-01-25 08:15:05 | C | 08 50 43.21 | +16 14 35.2 | – | V | G96 |
| 2020-01-25 08:22:25 | C | 08 50 42.97 | +16 14 36.3 | – | V | G96 |
| 2020-01-25 08:29:47 | C | 08 50 42.71 | +16 14 37.9 | – | V | G96 |
| 2020-01-26 08:45:33 | C | 08 49 52.743 | +16 19 12.35 | – | U | F51 |
| 2020-01-26 09:21:02 | C | 08 49 51.500 | +16 19 19.07 | – | U | F51 |
| 2020-01-26 09:39:04 | C | 08 49 50.871 | +16 19 22.47 | – | U | F51 |
| 2020-01-28 06:36:39 | C | 08 48 17.44 | +16 27 51.1 | – | U | I41 |
| 2020-01-28 06:57:37 | C | 08 48 16.73 | +16 27 54.7 | – | U | I41 |
| 2020-01-28 07:41:07 | C | 08 48 15.15 | +16 28 03.4 | – | U | I41 |
| 2020-01-28 08:01:54 | C | 08 48 14.42 | +16 28 07.3 | – | U | I41 |
| 2020-02-02 05:52:41 | C | 08 44 08.02 | +16 50 21.8 | – | V | G96 |
| 2020-02-02 06:00:45 | C | 08 44 07.68 | +16 50 23.7 | – | V | G96 |
| 2020-02-02 06:08:47 | C | 08 44 07.42 | +16 50 25.2 | – | V | G96 |
| 2020-02-02 06:16:50 | C | 08 44 07.13 | +16 50 26.2 | – | V | G96 |
| 2020-03-22 08:37:33 | C | 08 13 43.403 | +19 41 18.00 | – | U | F51 |
| 2020-03-22 08:55:37 | C | 08 13 43.211 | +19 41 19.63 | – | U | F51 |
| 2020-03-22 09:31:48 | C | 08 13 42.801 | +19 41 22.55 | – | U | F51 |
| 2020-12-13 11:30:17 | C | 11 35 42.81 | +08 17 36.5 | – | V | V00 |
| 2020-12-13 11:37:58 | C | 11 35 42.96 | +08 17 36.2 | – | V | V00 |
| 2020-12-13 11:45:36 | C | 11 35 43.12 | +08 17 36.5 | – | V | V00 |
| 2020-12-13 11:53:16 | C | 11 35 43.35 | +08 17 36.1 | – | V | V00 |
| 2020-12-20 12:04:48 | C | 11 39 14.50 | +08 18 58.2 | – | V | G96 |
| 2020-12-20 12:12:13 | C | 11 39 14.64 | +08 18 58.6 | – | V | G96 |
| 2020-12-20 12:19:38 | C | 11 39 14.77 | +08 18 58.9 | – | V | G96 |
| 2020-12-20 12:27:03 | C | 11 39 14.87 | +08 18 59.4 | – | V | G96 |
| 2020-12-24 14:13:21 | C | 11 40 58.442 | +08 22 46.14 | – | U | F52 |
| 2020-12-24 14:29:57 | C | 11 40 58.698 | +08 22 46.92 | – | U | F52 |
| 2020-12-24 14:46:37 | C | 11 40 58.974 | +08 22 47.92 | – | U | F52 |
| 2021-01-15 15:15:41 | C | 11 45 23.422 | +09 26 52.59 | – | U | F52 |
| 2021-01-15 15:32:29 | C | 11 45 23.392 | +09 26 55.87 | – | U | F52 |
| 2021-01-15 15:49:14 | C | 11 45 23.369 | +09 26 59.23 | – | U | F52 |
| 2021-02-05 11:29:54 | C | 11 40 08.23 | +11 43 08.2 | – | V | G96 |
| 2021-02-05 11:37:20 | C | 11 40 08.05 | +11 43 10.7 | – | V | G96 |
| 2021-02-05 11:44:46 | C | 11 40 07.89 | +11 43 13.4 | – | V | G96 |
| 2021-02-05 11:52:13 | C | 11 40 07.72 | +11 43 16.0 | – | V | G96 |
| 2021-02-08 08:26:27 | C | 11 38 36.54 | +12 07 27.6 | – | U | I41 |
| 2021-02-08 09:05:22 | C | 11 38 35.58 | +12 07 41.7 | – | U | I41 |
| 2021-02-10 09:05:06 | C | 11 37 24.58 | +12 25 18.8 | – | U | I41 |
| 2021-02-10 09:37:36 | C | 11 37 23.70 | +12 25 31.1 | – | U | I41 |
| 2021-02-12 14:07:01 | C | 11 35 59.373 | +12 45 23.77 | – | U | F51 |
| 2021-02-12 14:23:58 | C | 11 35 58.886 | +12 45 30.24 | – | U | F51 |
| 2021-02-12 14:40:56 | C | 11 35 58.398 | +12 45 36.69 | – | U | F51 |
| 2021-02-12 14:57:50 | C | 11 35 57.912 | +12 45 43.23 | – | U | F51 |
| 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 |