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 |
|---|---|---|---|---|---|---|
| 2017-09-30 12:58:03 | C | 04 37 49.72 | -01 50 48.7 | – | L | T05 |
| 2017-10-02 12:04:39 | C | 04 36 54.62 | -02 10 29.3 | – | L | T08 |
| 2017-10-02 12:15:21 | C | 04 36 54.39 | -02 10 33.6 | – | L | T08 |
| 2017-10-02 12:26:12 | C | 04 36 54.13 | -02 10 38.1 | – | L | T08 |
| 2017-10-02 12:36:24 | C | 04 36 53.91 | -02 10 42.5 | – | L | T08 |
| 2017-10-02 13:48:44 | C | 04 36 52.170 | -02 11 12.42 | – | L | F51 |
| 2017-10-02 14:06:33 | C | 04 36 51.741 | -02 11 19.82 | – | L | F51 |
| 2017-10-06 12:06:54 | C | 04 34 29.07 | -02 49 41.3 | – | L | T08 |
| 2017-10-06 12:19:56 | C | 04 34 28.50 | -02 49 46.0 | – | L | T08 |
| 2017-10-06 12:31:57 | C | 04 34 28.15 | -02 49 51.8 | – | L | T08 |
| 2017-10-06 12:45:02 | C | 04 34 27.83 | -02 49 56.1 | – | L | T08 |
| 2017-10-07 11:04:11 | C | 04 33 47.85 | -02 58 49.8 | – | L | T08 |
| 2017-10-07 11:07:01 | C | 04 33 47.78 | -02 58 49.7 | – | L | T08 |
| 2017-10-07 11:13:50 | C | 04 33 47.55 | -02 58 53.1 | – | L | T08 |
| 2017-10-07 11:16:35 | C | 04 33 47.53 | -02 58 54.5 | – | L | T08 |
| 2017-10-07 11:22:39 | C | 04 33 47.26 | -02 58 57.1 | – | L | T08 |
| 2017-10-07 11:25:24 | C | 04 33 47.14 | -02 58 57.8 | – | L | T08 |
| 2017-10-07 11:32:08 | C | 04 33 47.00 | -02 59 00.7 | – | L | T08 |
| 2017-10-07 11:34:51 | C | 04 33 46.86 | -02 59 01.2 | – | L | T08 |
| 2017-10-10 12:04:58 | C | 04 31 20.50 | -03 27 08.8 | – | L | T08 |
| 2017-10-10 12:15:24 | C | 04 31 20.09 | -03 27 12.9 | – | L | T08 |
| 2017-10-10 12:25:52 | C | 04 31 19.68 | -03 27 17.1 | – | L | T08 |
| 2017-10-10 12:36:20 | C | 04 31 19.28 | -03 27 21.1 | – | L | T08 |
| 2017-10-11 09:59:10 | C | 04 30 31.59 | -03 35 25.8 | – | U | 703 |
| 2017-10-11 10:06:23 | C | 04 30 31.26 | -03 35 28.0 | – | U | 703 |
| 2017-10-11 10:13:34 | C | 04 30 30.98 | -03 35 31.1 | – | U | 703 |
| 2017-10-11 10:20:46 | C | 04 30 30.66 | -03 35 33.6 | – | U | 703 |
| 2017-10-11 11:59:47 | C | 04 30 27.12 | -03 36 08.8 | – | L | T08 |
| 2017-10-11 12:10:15 | C | 04 30 26.66 | -03 36 12.7 | – | L | T08 |
| 2017-10-11 12:20:41 | C | 04 30 26.25 | -03 36 16.8 | – | L | T08 |
| 2017-10-11 12:31:11 | C | 04 30 25.84 | -03 36 20.7 | – | L | T08 |
| 2017-10-14 10:07:42 | C | 04 27 36.28 | -04 01 38.7 | – | U | 703 |
| 2017-10-14 10:14:55 | C | 04 27 35.94 | -04 01 41.2 | – | U | 703 |
| 2017-10-14 10:22:08 | C | 04 27 35.60 | -04 01 43.6 | – | U | 703 |
| 2017-10-14 10:29:21 | C | 04 27 35.31 | -04 01 46.2 | – | U | 703 |
| 2017-10-17 09:54:52 | C | 04 24 20.99 | -04 26 04.4 | – | U | 703 |
| 2017-10-17 10:02:47 | C | 04 24 20.61 | -04 26 06.6 | – | U | 703 |
| 2017-10-17 10:18:32 | C | 04 24 19.85 | -04 26 11.8 | – | U | 703 |
| 2017-10-19 02:46:55 | C | 04 22 21.17 | -04 39 08.5 | – | q | 160 |
| 2017-10-19 02:48:58 | C | 04 22 21.08 | -04 39 09.6 | – | q | 160 |
| 2017-10-19 02:51:02 | C | 04 22 20.94 | -04 39 10.5 | – | q | 160 |
| 2017-10-21 17:45:43 | C | 04 19 05.82 | -04 57 54.1 | – | q | D29 |
| 2017-10-21 18:08:38 | C | 04 19 04.56 | -04 58 00.6 | – | q | D29 |
| 2017-10-21 18:31:32 | C | 04 19 03.28 | -04 58 07.1 | – | q | D29 |
| 2017-10-22 11:14:56 | C | 04 18 09.46 | -05 02 46.4 | – | – | T08 |
| 2017-10-22 11:25:16 | C | 04 18 08.89 | -05 02 49.4 | – | – | T08 |
| 2017-10-22 11:25:55 | C | 04 18 08.85 | -05 02 49.6 | – | – | T08 |
| 2017-10-22 11:35:38 | C | 04 18 08.29 | -05 02 52.4 | – | – | T08 |
| 2017-10-22 11:36:17 | C | 04 18 08.25 | -05 02 52.9 | – | – | T08 |
| 2017-10-22 11:46:02 | C | 04 18 07.72 | -05 02 55.1 | – | – | T08 |
| 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 |