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 |
|---|---|---|---|---|---|---|
| 2021-02-16 10:57:21 | C | 11 33 14.72 | +13 21 52.4 | – | V | T08 |
| 2021-02-16 11:00:00 | C | 11 33 14.65 | +13 21 52.4 | – | V | T08 |
| 2021-02-16 11:35:48 | C | 11 33 13.45 | +13 22 07.3 | – | V | T08 |
| 2021-02-16 11:41:11 | C | 11 33 13.29 | +13 22 10.0 | – | V | T08 |
| 2021-02-17 13:57:01 | C | 11 32 22.904 | +13 32 44.24 | – | U | F51 |
| 2021-02-17 14:13:13 | C | 11 32 22.364 | +13 32 50.73 | – | U | F51 |
| 2021-02-17 14:29:22 | C | 11 32 21.823 | +13 32 57.26 | – | U | F51 |
| 2021-02-17 14:45:36 | C | 11 32 21.284 | +13 33 03.78 | – | U | F51 |
| 2021-02-22 11:55:18 | C | 11 28 19.32 | +14 21 24.6 | – | V | T05 |
| 2021-02-22 12:13:51 | C | 11 28 18.57 | +14 21 31.8 | – | V | T05 |
| 2021-02-22 12:31:51 | C | 11 28 17.90 | +14 21 40.6 | – | V | T05 |
| 2021-02-22 12:54:32 | C | 11 28 17.10 | +14 21 49.1 | – | V | T05 |
| 2021-03-04 11:39:40 | C | 11 18 46.65 | +16 02 48.9 | – | V | T08 |
| 2021-03-04 11:47:11 | C | 11 18 46.33 | +16 02 52.3 | – | V | T08 |
| 2021-03-04 11:51:24 | C | 11 18 46.10 | +16 02 54.7 | – | V | T08 |
| 2021-03-04 13:07:38 | C | 11 18 42.62 | +16 03 26.2 | – | V | T08 |
| 2021-03-07 07:49:37 | C | 11 15 49.50 | +16 31 21.3 | – | V | 703 |
| 2021-03-07 07:57:09 | C | 11 15 49.12 | +16 31 24.3 | – | V | 703 |
| 2021-03-07 08:04:41 | C | 11 15 48.80 | +16 31 27.1 | – | V | 703 |
| 2021-03-07 08:12:12 | C | 11 15 48.39 | +16 31 30.4 | – | V | 703 |
| 2021-03-09 05:00:17 | C | 11 13 49.88 | +16 50 00.3 | – | V | G96 |
| 2021-03-09 05:07:59 | C | 11 13 49.53 | +16 50 03.0 | – | V | G96 |
| 2021-03-09 05:14:10 | C | 11 13 49.26 | +16 50 05.9 | – | V | G96 |
| 2021-03-09 05:20:20 | C | 11 13 48.97 | +16 50 08.6 | – | V | G96 |
| 2021-03-10 07:55:39 | C | 11 12 37.59 | +17 00 59.1 | – | V | 703 |
| 2021-03-10 08:03:11 | C | 11 12 37.31 | +17 01 02.9 | – | V | 703 |
| 2021-03-10 08:10:44 | C | 11 12 36.90 | +17 01 05.3 | – | V | 703 |
| 2021-03-10 08:18:16 | C | 11 12 36.52 | +17 01 09.4 | – | V | 703 |
| 2021-03-12 01:22:48 | C | 11 10 45.70 | +17 17 45.0 | – | V | 221 |
| 2021-03-12 01:45:54 | C | 11 10 44.64 | +17 17 54.5 | – | V | 221 |
| 2021-03-12 02:09:03 | C | 11 10 43.59 | +17 18 03.6 | – | V | 221 |
| 2021-03-18 05:53:33 | C | 11 04 02.69 | +18 14 38.1 | – | V | G96 |
| 2021-03-18 06:01:47 | C | 11 04 02.34 | +18 14 40.9 | – | V | G96 |
| 2021-03-18 06:10:02 | C | 11 04 01.94 | +18 14 43.9 | – | V | G96 |
| 2021-03-18 06:18:17 | C | 11 04 01.57 | +18 14 47.0 | – | V | G96 |
| 2021-03-19 06:30:34 | C | 11 02 56.17 | +18 23 33.1 | – | U | I41 |
| 2021-03-19 07:05:23 | C | 11 02 54.57 | +18 23 45.6 | – | U | I41 |
| 2021-03-19 08:08:46 | C | 11 02 51.64 | +18 24 08.3 | – | U | I41 |
| 2021-03-20 10:00:08 | C | 11 01 42.12 | +18 33 19.7 | – | V | T08 |
| 2021-03-20 10:37:09 | C | 11 01 40.44 | +18 33 32.7 | – | V | T08 |
| 2021-03-20 10:41:22 | C | 11 01 40.24 | +18 33 34.1 | – | V | T08 |
| 2021-03-20 10:49:02 | C | 11 01 39.88 | +18 33 36.6 | – | V | T08 |
| 2021-03-21 06:59:31 | C | 11 00 45.98 | +18 40 37.1 | – | U | I41 |
| 2021-03-21 07:05:14 | C | 11 00 45.74 | +18 40 39.0 | – | U | I41 |
| 2021-03-30 06:42:10 | C | 10 51 33.70 | +19 47 23.1 | – | U | I41 |
| 2021-03-30 07:12:49 | C | 10 51 32.43 | +19 47 31.6 | – | U | I41 |
| 2021-03-30 07:26:34 | C | 10 51 31.87 | +19 47 35.2 | – | U | I41 |
| 2021-04-03 05:29:17 | C | 10 47 52.23 | +20 11 28.1 | – | U | I41 |
| 2021-04-03 06:22:21 | C | 10 47 50.13 | +20 11 40.6 | – | V | 703 |
| 2021-04-03 06:29:57 | C | 10 47 49.81 | +20 11 42.5 | – | V | 703 |
| 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 |