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 |
|---|---|---|---|---|---|---|
| 2025-02-05 06:40:10 | C | 09 53 28.342 | +16 00 59.08 | – | V | G96 |
| 2025-02-05 06:48:15 | C | 09 53 28.057 | +16 01 01.20 | – | V | G96 |
| 2025-02-05 06:56:21 | C | 09 53 27.769 | +16 01 02.96 | – | V | G96 |
| 2025-02-06 08:14:56 | C | 09 52 33.816 | +16 07 40.05 | – | X | F51 |
| 2025-02-06 08:54:24 | C | 09 52 32.382 | +16 07 50.30 | – | X | F51 |
| 2025-02-06 09:14:02 | C | 09 52 31.677 | +16 07 55.60 | – | X | F51 |
| 2025-02-16 10:25:43 | C | 09 43 38.248 | +17 10 36.34 | – | V | G96 |
| 2025-02-16 10:33:51 | C | 09 43 37.952 | +17 10 37.42 | – | V | G96 |
| 2025-02-16 10:41:19 | C | 09 43 37.686 | +17 10 39.83 | – | V | G96 |
| 2025-02-16 10:48:48 | C | 09 43 37.459 | +17 10 42.24 | – | V | G96 |
| 2025-02-18 07:59:09 | C | 09 41 55.853 | +17 22 10.85 | – | V | G96 |
| 2025-02-18 08:06:35 | C | 09 41 55.612 | +17 22 12.22 | – | V | G96 |
| 2025-02-18 08:14:01 | C | 09 41 55.316 | +17 22 14.23 | – | V | G96 |
| 2025-02-18 08:21:29 | C | 09 41 55.028 | +17 22 16.50 | – | V | G96 |
| 2025-02-20 07:33:54 | C | 09 40 09.111 | +17 34 06.30 | – | X | F52 |
| 2025-02-20 07:52:15 | C | 09 40 08.416 | +17 34 10.89 | – | X | F52 |
| 2025-02-20 08:10:42 | C | 09 40 07.707 | +17 34 15.50 | – | X | F52 |
| 2025-02-20 08:28:59 | C | 09 40 07.023 | +17 34 20.13 | – | X | F52 |
| 2025-02-25 06:57:36 | C | 09 35 43.545 | +18 03 05.16 | – | X | F52 |
| 2025-02-25 07:38:23 | C | 09 35 42.021 | +18 03 14.88 | – | X | F52 |
| 2025-02-25 07:58:54 | C | 09 35 41.271 | +18 03 19.88 | – | X | F52 |
| 2025-03-01 05:39:26 | C | 09 32 18.305 | +18 24 52.85 | – | V | G96 |
| 2025-03-01 05:47:33 | C | 09 32 18.049 | +18 24 54.25 | – | V | G96 |
| 2025-03-01 05:55:39 | C | 09 32 17.776 | +18 24 56.41 | – | V | G96 |
| 2025-03-01 06:03:46 | C | 09 32 17.466 | +18 24 58.46 | – | V | G96 |
| 2025-03-01 07:08:28 | C | 09 32 15.263 | +18 25 13.26 | – | X | F52 |
| 2025-03-01 07:09:22 | C | 09 32 15.210 | +18 25 13.47 | – | X | F52 |
| 2025-03-01 07:25:49 | C | 09 32 14.617 | +18 25 17.05 | – | X | F52 |
| 2025-03-01 07:26:43 | C | 09 32 14.601 | +18 25 17.43 | – | X | F52 |
| 2025-03-01 07:44:06 | C | 09 32 13.961 | +18 25 21.44 | – | X | F52 |
| 2025-03-01 08:00:42 | C | 09 32 13.362 | +18 25 25.06 | – | X | F52 |
| 2025-03-01 08:01:37 | C | 09 32 13.324 | +18 25 25.27 | – | X | F52 |
| 2025-03-19 06:16:53 | C | 09 18 51.433 | +19 46 21.90 | – | V | V00 |
| 2025-03-19 06:17:47 | C | 09 18 51.426 | +19 46 22.26 | – | V | V00 |
| 2025-03-19 06:25:00 | C | 09 18 51.214 | +19 46 23.02 | – | V | V00 |
| 2025-03-19 06:25:53 | C | 09 18 51.188 | +19 46 23.34 | – | V | V00 |
| 2025-03-19 06:33:04 | C | 09 18 51.001 | +19 46 24.31 | – | V | V00 |
| 2025-03-19 06:33:58 | C | 09 18 50.976 | +19 46 24.35 | – | V | V00 |
| 2025-03-19 06:41:09 | C | 09 18 50.796 | +19 46 25.54 | – | V | V00 |
| 2025-03-19 06:42:02 | C | 09 18 50.782 | +19 46 25.72 | – | V | V00 |
| 2025-03-22 04:12:46 | C | 09 17 08.779 | +19 56 21.55 | – | V | G96 |
| 2025-03-22 04:21:06 | C | 09 17 08.545 | +19 56 22.45 | – | V | G96 |
| 2025-03-22 04:29:23 | C | 09 17 08.351 | +19 56 24.00 | – | V | G96 |
| 2025-03-22 05:48:01 | C | 09 17 06.603 | +19 56 34.96 | – | X | F52 |
| 2025-03-22 06:05:32 | C | 09 17 06.174 | +19 56 37.33 | – | X | F52 |
| 2025-03-22 06:22:58 | C | 09 17 05.756 | +19 56 39.77 | – | X | F52 |
| 2025-03-22 06:40:33 | C | 09 17 05.337 | +19 56 41.98 | – | X | F52 |
| 2025-03-30 08:38:27 | C | 09 13 10.815 | +20 19 25.72 | – | X | F51 |
| 2025-03-30 08:57:21 | C | 09 13 10.462 | +20 19 27.52 | – | X | F51 |
| 2025-03-30 09:16:08 | C | 09 13 10.149 | +20 19 29.34 | – | X | 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 |