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 |
|---|---|---|---|---|---|---|
| 2017-12-14 04:57:04 | C | 03 12 39.368 | -03 45 22.51 | – | U | 268 |
| 2017-12-14 05:10:32 | C | 03 12 39.009 | -03 45 18.01 | – | U | 268 |
| 2017-12-14 05:26:24 | C | 03 12 38.597 | -03 45 12.72 | – | U | 268 |
| 2017-12-14 05:39:11 | C | 03 12 38.266 | -03 45 08.47 | – | U | 268 |
| 2017-12-15 05:39:42 | C | 03 12 03.31 | -03 37 13.2 | – | U | 703 |
| 2017-12-15 05:47:21 | C | 03 12 03.11 | -03 37 10.2 | – | U | 703 |
| 2017-12-15 05:55:00 | C | 03 12 02.93 | -03 37 07.8 | – | U | 703 |
| 2017-12-15 06:02:38 | C | 03 12 02.82 | -03 37 05.3 | – | U | 703 |
| 2017-12-16 06:13:35 | C | 03 11 29.38 | -03 28 53.3 | – | U | 703 |
| 2017-12-16 06:21:27 | C | 03 11 29.20 | -03 28 50.0 | – | U | 703 |
| 2017-12-16 06:29:18 | C | 03 11 29.04 | -03 28 48.6 | – | U | 703 |
| 2017-12-16 06:37:09 | C | 03 11 28.87 | -03 28 44.8 | – | U | 703 |
| 2017-12-17 03:29:15 | C | 03 11 02.03 | -03 21 33.9 | – | U | I41 |
| 2017-12-17 04:45:27 | C | 03 11 00.34 | -03 21 07.3 | – | U | I41 |
| 2017-12-18 02:50:15 | C | 03 10 33.56 | -03 13 25.5 | – | U | I41 |
| 2017-12-18 04:05:27 | C | 03 10 32.00 | -03 12 59.2 | – | U | I41 |
| 2017-12-18 05:51:48 | C | 03 10 29.78 | -03 12 22.0 | – | U | I41 |
| 2017-12-18 05:53:21 | C | 03 10 29.74 | -03 12 21.4 | – | U | I41 |
| 2017-12-22 05:40:56 | C | 03 08 53.36 | -02 37 57.0 | – | U | 703 |
| 2017-12-22 05:48:27 | C | 03 08 53.15 | -02 37 53.2 | – | U | 703 |
| 2017-12-22 05:56:00 | C | 03 08 53.13 | -02 37 51.4 | – | U | 703 |
| 2017-12-22 06:03:33 | C | 03 08 53.01 | -02 37 48.4 | – | U | 703 |
| 2017-12-23 04:41:21 | C | 03 08 34.89 | -02 29 28.2 | – | U | 703 |
| 2017-12-23 04:48:56 | C | 03 08 34.77 | -02 29 25.4 | – | U | 703 |
| 2017-12-23 04:56:30 | C | 03 08 34.71 | -02 29 22.7 | – | U | 703 |
| 2017-12-23 05:04:05 | C | 03 08 34.58 | -02 29 20.5 | – | U | 703 |
| 2017-12-23 05:20:34 | C | 03 08 34.36 | -02 29 14.0 | – | U | G96 |
| 2017-12-23 05:28:10 | C | 03 08 34.25 | -02 29 11.2 | – | U | G96 |
| 2017-12-23 05:35:46 | C | 03 08 34.14 | -02 29 08.4 | – | U | G96 |
| 2017-12-23 05:43:22 | C | 03 08 34.05 | -02 29 05.4 | – | U | G96 |
| 2017-12-26 03:16:44 | C | 03 07 49.04 | -02 03 04.6 | – | U | 703 |
| 2017-12-26 03:24:22 | C | 03 07 48.99 | -02 03 01.2 | – | U | 703 |
| 2017-12-26 03:31:58 | C | 03 07 48.82 | -02 02 58.5 | – | U | 703 |
| 2017-12-26 03:39:36 | C | 03 07 48.81 | -02 02 55.7 | – | U | 703 |
| 2018-01-01 07:59:07 | C | 03 07 03.311 | -01 05 51.57 | – | U | F51 |
| 2018-01-01 08:18:27 | C | 03 07 03.258 | -01 05 44.05 | – | U | F51 |
| 2018-01-13 04:02:53 | C | 03 08 29.80 | +00 46 16.8 | – | U | 703 |
| 2018-01-13 04:10:31 | C | 03 08 29.85 | +00 46 19.6 | – | U | 703 |
| 2018-01-13 04:18:07 | C | 03 08 29.89 | +00 46 24.3 | – | U | 703 |
| 2018-01-13 04:25:44 | C | 03 08 30.00 | +00 46 26.5 | – | U | 703 |
| 2018-01-16 04:16:37 | C | 03 09 24.19 | +01 14 56.7 | – | U | G96 |
| 2018-01-16 04:24:10 | C | 03 09 24.30 | +01 14 59.7 | – | U | G96 |
| 2018-01-16 04:31:41 | C | 03 09 24.38 | +01 15 02.6 | – | U | G96 |
| 2018-01-16 04:39:15 | C | 03 09 24.47 | +01 15 05.5 | – | U | G96 |
| 2018-01-19 03:55:00 | C | 03 10 29.97 | +01 43 17.0 | – | U | 703 |
| 2018-01-19 04:02:29 | C | 03 10 30.09 | +01 43 19.2 | – | U | 703 |
| 2018-01-19 04:09:59 | C | 03 10 30.14 | +01 43 23.0 | – | U | 703 |
| 2018-01-19 04:17:30 | C | 03 10 30.28 | +01 43 25.6 | – | U | 703 |
| 2018-02-05 03:57:04 | C | 03 19 56.85 | +04 20 45.2 | – | U | G96 |
| 2018-02-05 04:04:31 | C | 03 19 57.07 | +04 20 48.4 | – | U | 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 |