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 |
|---|---|---|---|---|---|---|
| 1999-06-26 03:26:28 | C | 13 59 49.36 | +44 29 52.9 | 15.5 | z | 762 |
| 1999-06-26 03:38:09 | C | 13 59 48.71 | +44 30 02.4 | 15.4 | z | 762 |
| 1999-06-26 03:46:53 | C | 13 59 48.25 | +44 30 07.8 | 15.2 | z | 762 |
| 1999-06-30 04:43:54 | C | 13 54 54.323 | +45 52 24.30 | – | – | 673 |
| 1999-06-30 04:50:19 | C | 13 54 53.885 | +45 52 30.06 | – | – | 673 |
| 1999-06-30 04:56:30 | C | 13 54 53.442 | +45 52 35.53 | – | – | 673 |
| 1999-06-30 04:57:52 | C | 13 54 52.46 | +45 52 22.2 | 15.4 | z | 762 |
| 1999-06-30 05:02:50 | C | 13 54 53.015 | +45 52 41.09 | – | – | 673 |
| 1999-06-30 05:03:56 | C | 13 54 52.36 | +45 52 39.5 | 15.8 | a | 704 |
| 1999-06-30 05:09:35 | C | 13 54 51.69 | +45 52 32.3 | 15.7 | z | 762 |
| 1999-06-30 05:18:49 | C | 13 54 51.36 | +45 52 52.1 | – | a | 704 |
| 1999-06-30 05:21:37 | C | 13 54 50.91 | +45 52 42.7 | 15.7 | z | 762 |
| 1999-06-30 05:33:31 | C | 13 54 50.24 | +45 52 52.1 | 15.5 | z | 762 |
| 1999-06-30 05:33:33 | C | 13 54 50.34 | +45 53 04.7 | – | a | 704 |
| 1999-06-30 05:37:45 | C | 13 54 50.630 | +45 53 11.44 | – | – | 673 |
| 1999-06-30 05:43:25 | C | 13 54 50.217 | +45 53 16.65 | – | – | 673 |
| 1999-06-30 05:48:18 | C | 13 54 49.38 | +45 53 17.5 | – | a | 704 |
| 1999-06-30 05:49:55 | C | 13 54 49.801 | +45 53 22.17 | – | – | 673 |
| 1999-06-30 06:03:04 | C | 13 54 48.46 | +45 53 29.9 | – | a | 704 |
| 1999-06-30 20:15:44 | C | 13 54 00.71 | +46 06 56.2 | – | z | 108 |
| 1999-06-30 20:18:49 | C | 13 54 00.43 | +46 07 00.5 | – | z | 108 |
| 1999-06-30 20:23:00 | C | 13 54 00.20 | +46 07 02.7 | – | z | 108 |
| 1999-06-30 20:28:55 | C | 13 53 59.79 | +46 07 08.4 | – | z | 108 |
| 1999-06-30 20:33:50 | C | 13 53 59.42 | +46 07 13.1 | – | z | 108 |
| 1999-06-30 20:41:00 | C | 13 53 59.03 | +46 07 20.9 | – | z | 108 |
| 1999-06-30 20:44:20 | C | 13 53 58.62 | +46 07 19.8 | – | c | 118 |
| 1999-06-30 20:57:54 | C | 13 53 57.72 | +46 07 31.9 | – | c | 118 |
| 1999-07-01 20:36:08 | C | 13 52 31.43 | +46 30 53.0 | – | c | 118 |
| 1999-07-01 20:44:28 | C | 13 52 30.83 | +46 31 00.9 | – | c | 118 |
| 1999-07-02 21:35:40 | C | 13 50 52.69 | +46 56 57.0 | – | c | 636 |
| 1999-07-02 21:41:30 | C | 13 50 52.26 | +46 57 03.0 | – | c | 636 |
| 1999-07-02 21:46:45 | C | 13 50 51.84 | +46 57 07.9 | – | c | 636 |
| 1999-07-02 21:51:59 | C | 13 50 51.44 | +46 57 13.1 | – | c | 636 |
| 1999-07-03 20:15:46 | C | 13 49 16.46 | +47 22 04.7 | – | z | 151 |
| 1999-07-03 20:27:31 | C | 13 49 15.33 | +47 22 19.4 | – | z | 151 |
| 1999-07-03 20:30:32 | C | 13 49 15.14 | +47 22 22.3 | – | z | 151 |
| 1999-07-03 20:35:32 | C | 13 49 14.70 | +47 22 27.6 | – | z | 151 |
| 1999-07-03 20:38:06 | C | 13 49 14.46 | +47 22 30.7 | – | z | 151 |
| 1999-07-03 20:47:35 | C | 13 49 13.61 | +47 22 40.7 | – | z | 151 |
| 1999-07-03 21:32:10 | C | 13 49 10.11 | +47 23 26.9 | – | c | 636 |
| 1999-07-03 21:37:20 | C | 13 49 09.71 | +47 23 32.8 | – | c | 636 |
| 1999-07-03 22:07:45 | C | 13 49 07.23 | +47 24 05.1 | – | c | 636 |
| 1999-07-04 21:02:24 | C | 13 47 20.26 | +47 51 07.7 | – | d | 046 |
| 1999-07-04 21:03:30 | C | 13 47 20.17 | +47 51 09.0 | – | d | 046 |
| 1999-07-04 21:04:52 | C | 13 47 20.05 | +47 51 10.6 | – | d | 046 |
| 1999-07-04 21:06:02 | C | 13 47 19.94 | +47 51 11.8 | – | d | 046 |
| 1999-07-04 21:12:16 | C | 13 47 19.40 | +47 51 18.5 | – | – | 557 |
| 1999-07-04 21:15:38 | C | 13 47 19.09 | +47 51 22.2 | – | – | 557 |
| 1999-07-04 21:18:58 | C | 13 47 18.79 | +47 51 26.1 | – | – | 557 |
| 1999-07-04 21:22:19 | C | 13 47 18.49 | +47 51 29.9 | – | – | 557 |
| 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 |