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 |
|---|---|---|---|---|---|---|
| 2017-11-27 05:07:43 | C | 03 27 44.64 | -05 36 00.9 | – | U | 703 |
| 2017-12-06 05:32:46 | C | 03 18 32.81 | -04 44 11.3 | – | u | H21 |
| 2017-12-06 05:35:15 | C | 03 18 32.72 | -04 44 10.7 | – | u | H21 |
| 2017-12-06 05:38:22 | C | 03 18 32.60 | -04 44 09.6 | – | u | H21 |
| 2017-12-06 05:41:28 | C | 03 18 32.47 | -04 44 08.8 | – | u | H21 |
| 2017-12-06 05:44:34 | C | 03 18 32.37 | -04 44 07.9 | – | u | H21 |
| 2017-12-06 05:47:39 | C | 03 18 32.25 | -04 44 07.0 | – | u | H21 |
| 2017-12-06 05:51:40 | C | 03 18 32.09 | -04 44 06.2 | – | u | H21 |
| 2017-12-07 04:51:34 | C | 03 17 42.93 | -04 37 36.2 | – | u | H21 |
| 2017-12-07 04:55:42 | C | 03 17 42.77 | -04 37 35.0 | – | u | H21 |
| 2017-12-07 04:58:48 | C | 03 17 42.67 | -04 37 33.8 | – | u | H21 |
| 2017-12-07 05:01:54 | C | 03 17 42.57 | -04 37 32.9 | – | u | H21 |
| 2017-12-07 05:04:59 | C | 03 17 42.45 | -04 37 31.9 | – | u | H21 |
| 2017-12-07 05:08:04 | C | 03 17 42.35 | -04 37 31.2 | – | u | H21 |
| 2017-12-07 05:09:55 | C | 03 17 42.29 | -04 37 30.6 | – | u | H21 |
| 2017-12-08 05:02:20 | C | 03 16 53.039 | -04 30 28.37 | – | U | 268 |
| 2017-12-08 05:14:47 | C | 03 16 52.586 | -04 30 24.71 | – | U | 268 |
| 2017-12-08 05:26:09 | C | 03 16 52.186 | -04 30 21.39 | – | U | 268 |
| 2017-12-08 05:38:13 | C | 03 16 51.773 | -04 30 17.77 | – | U | 268 |
| 2017-12-09 04:39:05 | C | 03 16 06.432 | -04 23 27.44 | – | U | 268 |
| 2017-12-09 04:56:17 | C | 03 16 05.864 | -04 23 22.22 | – | U | 268 |
| 2017-12-09 05:09:24 | C | 03 16 05.426 | -04 23 18.26 | – | U | 268 |
| 2017-12-09 05:23:36 | C | 03 16 04.934 | -04 23 13.98 | – | U | 268 |
| 2017-12-09 08:47:26 | C | 03 15 58.60 | -04 22 17.2 | – | U | T08 |
| 2017-12-09 08:57:51 | C | 03 15 58.29 | -04 22 14.4 | – | U | T08 |
| 2017-12-09 09:08:13 | C | 03 15 57.89 | -04 22 11.4 | – | U | T08 |
| 2017-12-09 09:18:34 | C | 03 15 57.54 | -04 22 07.8 | – | U | T08 |
| 2017-12-10 05:07:02 | C | 03 15 20.157 | -04 16 01.18 | – | U | 268 |
| 2017-12-10 05:20:29 | C | 03 15 19.723 | -04 15 57.06 | – | U | 268 |
| 2017-12-10 05:33:33 | C | 03 15 19.307 | -04 15 52.98 | – | U | 268 |
| 2017-12-10 05:46:53 | C | 03 15 18.883 | -04 15 48.90 | – | U | 268 |
| 2017-12-11 13:39:38 | C | 03 14 22.16 | -04 05 58.3 | – | q | D29 |
| 2017-12-11 14:00:01 | C | 03 14 21.53 | -04 05 51.9 | – | q | D29 |
| 2017-12-11 14:20:23 | C | 03 14 20.90 | -04 05 45.4 | – | q | D29 |
| 2017-12-12 03:25:44 | C | 03 13 58.541 | -04 01 29.93 | – | U | 268 |
| 2017-12-12 03:44:49 | C | 03 13 57.975 | -04 01 23.82 | – | U | 268 |
| 2017-12-12 03:58:50 | C | 03 13 57.565 | -04 01 19.30 | – | U | 268 |
| 2017-12-12 04:12:44 | C | 03 13 57.156 | -04 01 14.78 | – | U | 268 |
| 2017-12-12 07:50:48 | C | 03 13 51.260 | -04 00 09.94 | – | U | F51 |
| 2017-12-12 07:53:45 | C | 03 13 51.167 | -04 00 09.06 | – | U | F51 |
| 2017-12-12 08:07:42 | C | 03 13 50.760 | -04 00 04.54 | – | U | F51 |
| 2017-12-12 08:10:39 | C | 03 13 50.671 | -04 00 03.66 | – | U | F51 |
| 2017-12-12 08:24:38 | C | 03 13 50.265 | -03 59 59.13 | – | U | F51 |
| 2017-12-12 08:27:34 | C | 03 13 50.172 | -03 59 58.18 | – | U | F51 |
| 2017-12-12 08:41:31 | C | 03 13 49.765 | -03 59 53.70 | – | U | F51 |
| 2017-12-12 08:44:27 | C | 03 13 49.677 | -03 59 52.79 | – | U | F51 |
| 2017-12-13 04:28:30 | C | 03 13 17.392 | -03 53 25.08 | – | U | 268 |
| 2017-12-13 04:41:46 | C | 03 13 17.023 | -03 53 20.72 | – | U | 268 |
| 2017-12-13 04:54:10 | C | 03 13 16.680 | -03 53 16.65 | – | U | 268 |
| 2017-12-13 05:09:31 | C | 03 13 16.254 | -03 53 11.73 | – | U | 268 |
| 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 |