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 |
|---|---|---|---|---|---|---|
| 2017-10-22 11:46:42 | C | 04 18 07.68 | -05 02 55.3 | – | – | T08 |
| 2017-10-22 11:57:09 | C | 04 18 07.08 | -05 02 58.3 | – | – | T08 |
| 2017-10-25 09:58:26 | C | 04 14 12.25 | -05 21 08.7 | – | U | G96 |
| 2017-10-25 10:05:59 | C | 04 14 11.81 | -05 21 10.5 | – | U | G96 |
| 2017-10-25 10:11:17 | C | 04 14 11.35 | -05 21 11.9 | – | q | H45 |
| 2017-10-25 10:12:58 | C | 04 14 11.26 | -05 21 12.7 | – | q | H45 |
| 2017-10-25 10:14:21 | C | 04 14 11.19 | -05 21 12.9 | – | q | H45 |
| 2017-10-25 10:16:04 | C | 04 14 11.08 | -05 21 13.4 | – | q | H45 |
| 2017-10-25 10:17:27 | C | 04 14 10.99 | -05 21 13.5 | – | q | H45 |
| 2017-10-25 10:18:07 | C | 04 14 11.09 | -05 21 13.2 | – | U | G96 |
| 2017-10-25 10:18:50 | C | 04 14 10.91 | -05 21 13.8 | – | q | H45 |
| 2017-10-25 10:25:43 | C | 04 14 10.64 | -05 21 15.3 | – | U | G96 |
| 2017-10-26 09:05:04 | C | 04 12 52.27 | -05 26 36.1 | – | U | 703 |
| 2017-10-26 09:12:52 | C | 04 12 51.78 | -05 26 38.0 | – | U | 703 |
| 2017-10-26 09:20:39 | C | 04 12 51.33 | -05 26 39.6 | – | U | 703 |
| 2017-10-26 09:28:28 | C | 04 12 50.85 | -05 26 41.7 | – | U | 703 |
| 2017-10-28 10:59:45 | C | 04 09 55.62 | -05 37 23.9 | – | – | T05 |
| 2017-10-28 11:11:47 | C | 04 09 54.87 | -05 37 26.4 | – | – | T05 |
| 2017-10-28 11:35:51 | C | 04 09 53.37 | -05 37 31.4 | – | – | T05 |
| 2017-10-29 07:39:12 | C | 04 08 41.14 | -05 41 30.5 | – | U | 703 |
| 2017-10-29 07:50:55 | C | 04 08 40.41 | -05 41 33.0 | – | U | 703 |
| 2017-10-29 07:59:05 | C | 04 08 39.89 | -05 41 34.5 | – | U | 703 |
| 2017-10-29 08:07:13 | C | 04 08 39.39 | -05 41 36.1 | – | U | 703 |
| 2017-10-30 10:27:59 | C | 04 07 03.45 | -05 46 26.4 | – | – | T08 |
| 2017-10-30 10:38:28 | C | 04 07 02.81 | -05 46 28.1 | – | – | T08 |
| 2017-10-30 10:48:57 | C | 04 07 02.13 | -05 46 30.2 | – | – | T08 |
| 2017-10-30 10:59:27 | C | 04 07 01.46 | -05 46 31.8 | – | – | T08 |
| 2017-10-30 12:16:33 | C | 04 06 56.602 | -05 46 45.56 | – | L | F51 |
| 2017-10-30 12:34:45 | C | 04 06 55.449 | -05 46 48.78 | – | L | F51 |
| 2017-10-30 12:52:54 | C | 04 06 54.303 | -05 46 51.94 | – | L | F51 |
| 2017-11-01 10:06:37 | C | 04 04 07.61 | -05 54 14.4 | – | – | T05 |
| 2017-11-01 10:17:12 | C | 04 04 06.92 | -05 54 15.8 | – | – | T05 |
| 2017-11-01 10:27:42 | C | 04 04 06.28 | -05 54 17.7 | – | – | T05 |
| 2017-11-01 10:38:01 | C | 04 04 05.58 | -05 54 19.3 | – | – | T05 |
| 2017-11-07 10:24:49 | C | 03 55 05.02 | -06 09 47.5 | – | U | T08 |
| 2017-11-07 10:38:21 | C | 03 55 04.13 | -06 09 48.7 | – | U | T08 |
| 2017-11-07 10:51:26 | C | 03 55 03.27 | -06 09 49.6 | – | U | T08 |
| 2017-11-07 11:03:00 | C | 03 55 02.53 | -06 09 50.1 | – | U | T08 |
| 2017-11-09 10:26:28 | C | 03 52 04.12 | -06 12 14.2 | – | U | T05 |
| 2017-11-09 10:41:07 | C | 03 52 03.18 | -06 12 15.0 | – | U | T05 |
| 2017-11-09 10:54:10 | C | 03 52 02.32 | -06 12 15.4 | – | U | T05 |
| 2017-11-09 11:07:18 | C | 03 52 01.47 | -06 12 15.7 | – | U | T05 |
| 2017-11-10 15:13:03 | C | 03 50 16.37 | -06 13 03.6 | – | q | D29 |
| 2017-11-10 15:38:31 | C | 03 50 14.74 | -06 13 04.0 | – | q | D29 |
| 2017-11-10 16:03:57 | C | 03 50 13.09 | -06 13 04.5 | – | q | D29 |
| 2017-11-11 10:17:41 | C | 03 49 05.18 | -06 13 18.0 | – | U | T08 |
| 2017-11-11 10:29:55 | C | 03 49 04.41 | -06 13 17.7 | – | U | T08 |
| 2017-11-11 10:41:38 | C | 03 49 03.63 | -06 13 17.8 | – | U | T08 |
| 2017-11-11 10:52:19 | C | 03 49 02.94 | -06 13 18.1 | – | U | T08 |
| 2017-11-13 10:13:28 | C | 03 46 08.08 | -06 12 59.9 | – | U | T05 |
| 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 |