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 |
|---|---|---|---|---|---|---|
| 2021-04-03 06:37:31 | C | 10 47 49.52 | +20 11 44.2 | – | V | 703 |
| 2021-04-03 06:43:35 | C | 10 47 49.35 | +20 11 45.7 | – | U | I41 |
| 2021-04-03 06:45:06 | C | 10 47 49.30 | +20 11 45.9 | – | V | 703 |
| 2021-04-05 04:20:18 | C | 10 46 09.02 | +20 22 06.3 | – | V | G96 |
| 2021-04-05 04:28:37 | C | 10 46 08.73 | +20 22 08.4 | – | V | G96 |
| 2021-04-05 04:36:56 | C | 10 46 08.42 | +20 22 09.8 | – | V | G96 |
| 2021-04-05 04:46:25 | C | 10 46 08.07 | +20 22 11.9 | – | V | G96 |
| 2021-04-09 08:19:41 | C | 10 42 44.50 | +20 41 57.0 | – | V | T08 |
| 2021-04-09 08:33:07 | C | 10 42 44.00 | +20 41 58.9 | – | V | T08 |
| 2021-04-09 08:37:45 | C | 10 42 43.91 | +20 42 00.3 | – | V | T08 |
| 2021-04-09 09:00:15 | C | 10 42 43.13 | +20 42 04.2 | – | V | T08 |
| 2021-04-29 13:28:13 | C | 10 32 29.42 | +21 23 18.6 | – | q | D29 |
| 2021-04-29 13:52:49 | C | 10 32 29.13 | +21 23 18.9 | – | q | D29 |
| 2021-04-29 14:13:11 | C | 10 32 28.97 | +21 23 18.8 | – | q | D29 |
| 2021-05-04 04:39:05 | C | 10 31 45.05 | +21 21 00.0 | – | U | I41 |
| 2021-05-04 05:09:41 | C | 10 31 44.88 | +21 20 58.7 | – | U | I41 |
| 2021-05-06 04:38:23 | C | 10 31 37.21 | +21 18 46.5 | – | U | I41 |
| 2021-05-06 05:37:47 | C | 10 31 37.05 | +21 18 43.2 | – | U | I41 |
| 2023-01-22 05:28:40 | C | 05 26 20.222 | +11 11 36.51 | – | U | F52 |
| 2023-01-22 05:38:39 | C | 05 26 19.973 | +11 11 38.09 | – | U | F52 |
| 2023-01-22 05:48:39 | C | 05 26 19.718 | +11 11 39.39 | – | U | F52 |
| 2023-01-22 05:58:39 | C | 05 26 19.472 | +11 11 40.93 | – | U | F52 |
| 2023-12-16 10:49:27 | C | 08 19 53.018 | +14 07 49.41 | – | X | F51 |
| 2023-12-16 11:07:07 | C | 08 19 52.593 | +14 07 50.72 | – | X | F51 |
| 2023-12-16 11:25:10 | C | 08 19 52.152 | +14 07 52.27 | – | X | F51 |
| 2023-12-16 11:53:55 | C | 08 19 51.483 | +14 07 54.85 | – | X | F51 |
| 2024-01-11 07:07:31 | C | 08 01 26.166 | +15 20 10.10 | – | V | G96 |
| 2024-01-11 07:14:57 | C | 08 01 25.878 | +15 20 11.22 | – | V | G96 |
| 2024-01-11 07:22:23 | C | 08 01 25.572 | +15 20 13.13 | – | V | G96 |
| 2024-01-11 07:29:48 | C | 08 01 25.320 | +15 20 13.88 | – | V | G96 |
| 2024-01-30 05:10:49 | C | 07 45 43.506 | +16 26 30.41 | – | V | G96 |
| 2024-01-30 05:18:58 | C | 07 45 43.297 | +16 26 30.77 | – | V | G96 |
| 2024-01-30 05:27:06 | C | 07 45 43.031 | +16 26 31.49 | – | V | G96 |
| 2024-01-30 05:35:14 | C | 07 45 42.710 | +16 26 33.65 | – | V | G96 |
| 2024-02-03 07:28:25 | C | 07 42 30.407 | +16 40 50.11 | – | X | F52 |
| 2024-02-03 07:45:16 | C | 07 42 29.819 | +16 40 52.87 | – | X | F52 |
| 2024-02-03 08:02:09 | C | 07 42 29.289 | +16 40 55.39 | – | X | F52 |
| 2024-02-03 08:19:09 | C | 07 42 28.727 | +16 40 58.02 | – | X | F52 |
| 2024-12-25 12:13:32 | C | 10 16 40.702 | +12 34 39.57 | – | X | F52 |
| 2024-12-25 12:30:05 | C | 10 16 40.573 | +12 34 41.72 | – | X | F52 |
| 2024-12-25 13:03:12 | C | 10 16 40.264 | +12 34 45.86 | – | X | F52 |
| 2024-12-29 11:54:27 | C | 10 15 45.780 | +12 47 09.87 | – | X | F51 |
| 2024-12-29 12:09:10 | C | 10 15 45.605 | +12 47 12.00 | – | X | F51 |
| 2024-12-29 12:23:52 | C | 10 15 45.428 | +12 47 14.00 | – | X | F51 |
| 2024-12-29 12:38:39 | C | 10 15 45.256 | +12 47 16.26 | – | X | F51 |
| 2025-02-02 08:28:47 | C | 09 55 55.110 | +15 42 44.75 | – | V | G96 |
| 2025-02-02 08:36:12 | C | 09 55 54.854 | +15 42 46.76 | – | V | G96 |
| 2025-02-02 08:43:37 | C | 09 55 54.592 | +15 42 48.74 | – | V | G96 |
| 2025-02-02 08:51:02 | C | 09 55 54.322 | +15 42 50.54 | – | V | G96 |
| 2025-02-05 06:32:06 | C | 09 53 28.622 | +16 00 56.99 | – | V | G96 |
| 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 |