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 |
|---|---|---|---|---|---|---|
| 2012-03-22 06:36:38 | C | 10 48 49.10 | +19 06 04.2 | – | r | G96 |
| 2012-03-22 06:39:32 | C | 10 48 48.96 | +19 06 05.3 | – | r | G96 |
| 2012-03-24 08:00:10 | C | 10 46 41.66 | +19 21 24.5 | – | r | 703 |
| 2012-03-24 08:11:31 | C | 10 46 41.16 | +19 21 27.2 | – | r | 703 |
| 2012-03-24 08:22:50 | C | 10 46 40.51 | +19 21 30.2 | – | r | 703 |
| 2012-03-24 08:34:22 | C | 10 46 40.15 | +19 21 33.5 | – | r | 703 |
| 2013-11-26 08:11:35 | C | 06 20 33.50 | +09 26 00.1 | – | u | 807 |
| 2013-11-26 08:17:58 | C | 06 20 33.27 | +09 25 59.8 | – | u | 807 |
| 2013-11-26 08:25:14 | C | 06 20 33.00 | +09 25 59.7 | – | u | 807 |
| 2013-12-03 13:08:24 | C | 06 13 46.328 | +09 26 03.81 | – | L | F51 |
| 2013-12-03 13:23:35 | C | 06 13 45.697 | +09 26 04.04 | – | L | F51 |
| 2014-01-02 07:57:43 | C | 05 43 11.47 | +10 12 02.1 | – | q | G96 |
| 2014-01-02 08:06:43 | C | 05 43 11.10 | +10 12 03.3 | – | q | G96 |
| 2014-01-02 08:15:43 | C | 05 43 10.74 | +10 12 04.0 | – | q | G96 |
| 2014-01-02 08:24:43 | C | 05 43 10.37 | +10 12 05.4 | – | q | G96 |
| 2014-11-26 09:49:09 | C | 08 27 59.88 | +13 39 04.9 | – | u | H21 |
| 2014-11-26 10:03:55 | C | 08 27 59.71 | +13 39 05.4 | – | u | H21 |
| 2014-11-26 10:20:31 | C | 08 27 59.56 | +13 39 06.4 | – | u | H21 |
| 2014-11-29 12:34:05 | C | 08 27 11.837 | +13 41 27.05 | – | L | F51 |
| 2014-11-29 12:52:13 | C | 08 27 11.629 | +13 41 27.77 | – | L | F51 |
| 2014-11-29 13:10:24 | C | 08 27 11.397 | +13 41 28.65 | – | L | F51 |
| 2015-01-13 08:19:21 | C | 07 59 46.451 | +15 26 08.42 | – | L | F51 |
| 2015-01-13 08:38:55 | C | 07 59 45.754 | +15 26 11.27 | – | L | F51 |
| 2015-01-13 08:58:21 | C | 07 59 45.059 | +15 26 14.01 | – | L | F51 |
| 2015-01-13 09:17:50 | C | 07 59 44.394 | +15 26 16.65 | – | L | F51 |
| 2015-01-17 06:45:02 | C | 07 56 28.56 | +15 39 45.7 | – | q | G96 |
| 2015-01-17 06:51:38 | C | 07 56 28.29 | +15 39 47.3 | – | q | G96 |
| 2015-01-17 07:04:48 | C | 07 56 27.82 | +15 39 49.3 | – | q | G96 |
| 2016-01-09 11:40:02 | C | 10 11 31.991 | +13 27 41.60 | – | L | F51 |
| 2016-01-09 11:56:48 | C | 10 11 31.675 | +13 27 44.56 | – | L | F51 |
| 2016-01-09 12:13:30 | C | 10 11 31.337 | +13 27 47.82 | – | L | F51 |
| 2016-01-09 12:30:16 | C | 10 11 31.003 | +13 27 51.05 | – | L | F51 |
| 2016-01-17 09:55:58 | C | 10 07 20.594 | +14 06 13.75 | – | L | F51 |
| 2016-01-17 10:13:21 | C | 10 07 20.147 | +14 06 17.61 | – | L | F51 |
| 2016-01-17 10:31:09 | C | 10 07 19.715 | +14 06 21.66 | – | L | F51 |
| 2016-01-17 10:48:38 | C | 10 07 19.232 | +14 06 25.44 | – | L | F51 |
| 2016-01-19 10:27:11 | C | 10 06 06.243 | +14 16 57.58 | – | L | F51 |
| 2016-01-19 10:43:52 | C | 10 06 05.783 | +14 17 00.96 | – | L | F51 |
| 2016-01-19 11:00:35 | C | 10 06 05.330 | +14 17 05.00 | – | L | F51 |
| 2016-01-30 10:21:41 | C | 09 58 17.37 | +15 20 16.1 | – | q | G96 |
| 2016-01-30 10:27:51 | C | 09 58 17.20 | +15 20 17.7 | – | q | G96 |
| 2016-01-30 10:34:00 | C | 09 58 16.98 | +15 20 19.0 | – | q | G96 |
| 2016-01-30 10:40:09 | C | 09 58 16.75 | +15 20 20.2 | – | q | G96 |
| 2016-01-31 08:57:35 | C | 09 57 32.988 | +15 25 59.87 | – | L | F51 |
| 2016-01-31 09:18:58 | C | 09 57 32.267 | +15 26 05.29 | – | L | F51 |
| 2016-01-31 09:40:17 | C | 09 57 31.548 | +15 26 10.71 | – | L | F51 |
| 2016-01-31 10:01:38 | C | 09 57 30.832 | +15 26 16.21 | – | L | F51 |
| 2016-02-10 07:14:32 | C | 09 49 11.55 | +16 27 40.1 | – | q | G96 |
| 2016-02-10 07:23:25 | C | 09 49 11.21 | +16 27 42.4 | – | q | G96 |
| 2016-02-10 07:31:33 | C | 09 49 10.90 | +16 27 44.5 | – | q | 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 |