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 |
|---|---|---|---|---|---|---|
| 2008-12-22 05:54:10 | C | 02 46 56.626 | -04 37 53.45 | – | – | 645 |
| 2008-12-22 05:56:34 | C | 02 46 56.626 | -04 37 52.35 | – | – | 645 |
| 2008-12-22 05:57:45 | C | 02 46 56.615 | -04 37 51.74 | – | – | 645 |
| 2008-12-30 03:22:01 | C | 02 47 21.08 | -03 09 52.7 | – | r | 703 |
| 2008-12-30 03:32:25 | C | 02 47 21.22 | -03 09 47.7 | – | r | 703 |
| 2008-12-30 03:42:37 | C | 02 47 21.26 | -03 09 43.2 | – | r | 703 |
| 2008-12-30 03:53:03 | C | 02 47 21.33 | -03 09 38.0 | – | r | 703 |
| 2008-12-30 06:07:33 | C | 02 47 22.034 | -03 08 36.59 | – | – | 645 |
| 2008-12-30 06:08:45 | C | 02 47 22.040 | -03 08 35.93 | – | – | 645 |
| 2008-12-30 06:11:08 | C | 02 47 22.053 | -03 08 34.95 | – | – | 645 |
| 2008-12-30 06:12:20 | C | 02 47 22.065 | -03 08 34.60 | – | – | 645 |
| 2008-12-30 20:04:24 | C | 02 47 28.19 | -03 02 07.0 | – | r | 130 |
| 2008-12-30 20:09:21 | C | 02 47 28.22 | -03 02 04.1 | – | r | 130 |
| 2011-01-24 04:08:07 | C | 08 46 18.87 | +16 07 40.8 | – | o | 691 |
| 2011-01-24 04:33:41 | C | 08 46 18.08 | +16 07 45.7 | – | o | 691 |
| 2012-01-23 08:56:59 | C | 11 36 22.35 | +10 27 06.9 | – | r | 703 |
| 2012-01-23 09:11:38 | C | 11 36 22.10 | +10 27 10.7 | – | r | 703 |
| 2012-01-23 09:26:26 | C | 11 36 21.99 | +10 27 13.3 | – | r | 703 |
| 2012-01-23 09:41:05 | C | 11 36 21.96 | +10 27 17.6 | – | r | 703 |
| 2012-01-25 11:16:47 | C | 11 35 49.84 | +10 40 18.6 | – | o | 691 |
| 2012-01-25 11:42:22 | C | 11 35 49.49 | +10 40 25.8 | – | o | 691 |
| 2012-01-25 12:07:58 | C | 11 35 49.17 | +10 40 32.6 | – | o | 691 |
| 2012-01-29 11:06:19 | C | 11 34 30.83 | +11 07 31.2 | – | o | 691 |
| 2012-01-29 11:31:56 | C | 11 34 30.40 | +11 07 39.1 | – | o | 691 |
| 2012-01-29 11:57:32 | C | 11 34 29.94 | +11 07 46.6 | – | o | 691 |
| 2012-02-02 11:04:05 | C | 11 32 49.00 | +11 37 21.3 | – | o | 691 |
| 2012-02-02 11:29:43 | C | 11 32 48.43 | +11 37 29.7 | – | o | 691 |
| 2012-02-02 11:55:18 | C | 11 32 48.08 | +11 37 37.1 | – | o | 691 |
| 2012-02-25 08:42:46 | C | 11 16 08.14 | +15 06 32.9 | – | r | 703 |
| 2012-02-25 08:50:03 | C | 11 16 07.86 | +15 06 35.0 | – | r | 703 |
| 2012-02-25 08:57:22 | C | 11 16 07.50 | +15 06 39.2 | – | r | 703 |
| 2012-02-25 09:04:45 | C | 11 16 07.28 | +15 06 41.9 | – | r | 703 |
| 2012-02-29 07:43:13 | C | 11 12 14.65 | +15 46 04.3 | – | r | 703 |
| 2012-02-29 07:51:04 | C | 11 12 14.32 | +15 46 06.8 | – | r | 703 |
| 2012-02-29 07:58:58 | C | 11 12 13.93 | +15 46 10.3 | – | r | 703 |
| 2012-02-29 08:06:46 | C | 11 12 13.71 | +15 46 14.1 | – | r | 703 |
| 2012-03-13 05:20:50 | C | 10 58 32.19 | +17 50 09.5 | – | r | 703 |
| 2012-03-13 05:28:05 | C | 10 58 31.87 | +17 50 12.4 | – | r | 703 |
| 2012-03-13 05:35:21 | C | 10 58 31.54 | +17 50 15.5 | – | r | 703 |
| 2012-03-13 05:42:40 | C | 10 58 31.18 | +17 50 18.3 | – | r | 703 |
| 2012-03-14 05:35:29 | C | 10 57 26.24 | +17 59 14.0 | – | r | G96 |
| 2012-03-14 05:46:16 | C | 10 57 25.74 | +17 59 18.0 | – | r | G96 |
| 2012-03-14 05:57:14 | C | 10 57 25.27 | +17 59 22.0 | – | r | G96 |
| 2012-03-14 06:08:09 | C | 10 57 24.73 | +17 59 26.2 | – | r | G96 |
| 2012-03-20 06:53:21 | C | 10 50 54.816 | +18 50 32.65 | – | L | F51 |
| 2012-03-20 07:08:57 | C | 10 50 54.104 | +18 50 37.87 | – | L | F51 |
| 2012-03-20 07:25:26 | C | 10 50 53.381 | +18 50 43.52 | – | L | F51 |
| 2012-03-20 07:41:54 | C | 10 50 52.626 | +18 50 48.99 | – | L | F51 |
| 2012-03-22 06:30:36 | C | 10 48 49.39 | +19 06 02.5 | – | r | G96 |
| 2012-03-22 06:33:37 | C | 10 48 49.24 | +19 06 03.4 | – | r | 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 |