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 |
|---|---|---|---|---|---|---|
| 1990-04-27 08:08:45 | A | 14 35 10.55 | +23 32 32.9 | 15.7 | – | 675 |
| 1990-04-27 08:33:30 | A | 14 35 09.51 | +23 33 00.9 | – | – | 675 |
| 1990-04-29 06:39:44 | A | 14 33 21.81 | +24 23 04.8 | – | – | 675 |
| 1990-04-29 07:12:14 | A | 14 33 20.41 | +24 23 39.5 | – | – | 675 |
| 1999-04-10 10:06:59 | C | 15 03 03.16 | +15 13 23.9 | 17.9 | a | 704 |
| 1999-04-10 10:33:55 | C | 15 03 03.17 | +15 13 52.2 | – | a | 704 |
| 1999-04-10 11:00:48 | C | 15 03 03.08 | +15 14 20.5 | – | a | 704 |
| 1999-04-10 11:27:37 | C | 15 03 03.13 | +15 14 48.0 | – | a | 704 |
| 1999-05-13 05:49:23 | C | 14 46 21.85 | +30 26 10.2 | 16.4 | a | 704 |
| 1999-05-13 06:02:10 | C | 14 46 21.24 | +30 26 24.6 | – | a | 704 |
| 1999-05-13 06:16:21 | C | 14 46 20.58 | +30 26 39.9 | – | a | 704 |
| 1999-05-13 06:28:38 | C | 14 46 20.00 | +30 26 53.7 | – | a | 704 |
| 1999-05-13 06:41:47 | C | 14 46 19.40 | +30 27 08.3 | – | a | 704 |
| 1999-05-15 05:29:41 | C | 14 44 20.64 | +31 18 10.8 | 17.9 | a | 704 |
| 1999-05-15 05:51:27 | C | 14 44 19.56 | +31 18 34.5 | – | a | 704 |
| 1999-05-15 06:13:19 | C | 14 44 18.50 | +31 18 57.9 | – | a | 704 |
| 1999-05-15 06:35:14 | C | 14 44 17.44 | +31 19 21.2 | – | a | 704 |
| 1999-05-15 06:57:01 | C | 14 44 16.42 | +31 19 43.6 | – | a | 704 |
| 1999-05-16 00:54:04 | C | 14 43 29.02 | +31 38 52.0 | – | d | 046 |
| 1999-05-16 00:57:31 | C | 14 43 28.86 | +31 38 55.7 | – | d | 046 |
| 1999-05-16 01:29:43 | C | 14 43 27.25 | +31 39 28.5 | – | c | 118 |
| 1999-05-16 01:43:33 | C | 14 43 26.65 | +31 39 42.8 | – | c | 118 |
| 1999-05-16 01:53:17 | C | 14 43 26.20 | +31 39 52.9 | – | c | 118 |
| 1999-05-16 12:42:02 | C | 14 42 58.98 | +31 51 26.7 | – | z | 903 |
| 1999-05-16 12:42:21 | C | 14 42 58.96 | +31 51 46.3 | – | – | 426 |
| 1999-05-16 12:48:18 | C | 14 42 58.67 | +31 51 52.6 | – | – | 426 |
| 1999-05-16 12:50:49 | C | 14 42 58.53 | +31 51 36.3 | – | z | 903 |
| 1999-05-16 12:53:10 | C | 14 42 58.42 | +31 51 58.1 | – | – | 426 |
| 1999-05-16 12:59:35 | C | 14 42 58.10 | +31 51 45.8 | – | z | 903 |
| 1999-05-16 19:38:09 | C | 14 42 40.85 | +31 58 44.0 | – | z | 596 |
| 1999-05-16 19:48:02 | C | 14 42 40.38 | +31 58 54.2 | – | z | 596 |
| 1999-05-16 19:54:34 | C | 14 42 39.95 | +31 58 57.5 | – | – | 557 |
| 1999-05-16 19:55:56 | C | 14 42 39.86 | +31 58 59.0 | – | – | 557 |
| 1999-05-16 19:57:17 | C | 14 42 39.81 | +31 59 00.5 | – | – | 557 |
| 1999-05-16 19:57:56 | C | 14 42 39.92 | +31 59 04.8 | – | z | 596 |
| 1999-05-16 19:58:39 | C | 14 42 39.74 | +31 59 01.8 | – | – | 557 |
| 1999-05-16 20:00:00 | C | 14 42 39.69 | +31 59 03.2 | – | – | 557 |
| 1999-05-16 20:06:06 | C | 14 42 39.49 | +31 59 10.8 | – | z | 151 |
| 1999-05-16 20:10:25 | C | 14 42 39.31 | +31 59 14.3 | – | z | 151 |
| 1999-05-16 20:13:55 | C | 14 42 39.14 | +31 59 18.6 | – | z | 151 |
| 1999-05-16 20:17:24 | C | 14 42 38.87 | +31 59 23.5 | – | d | 046 |
| 1999-05-16 20:21:02 | C | 14 42 38.68 | +31 59 27.1 | – | d | 046 |
| 1999-05-16 20:22:37 | C | 14 42 38.61 | +31 59 28.7 | – | d | 046 |
| 1999-05-16 20:24:12 | C | 14 42 38.55 | +31 59 30.7 | – | d | 046 |
| 1999-05-16 20:26:38 | C | 14 42 38.55 | +31 59 31.9 | – | z | 151 |
| 1999-05-16 20:28:52 | C | 14 42 38.43 | +31 59 33.8 | – | z | 151 |
| 1999-05-16 20:33:11 | C | 14 42 38.20 | +31 59 39.1 | – | z | 151 |
| 1999-05-16 20:33:13 | C | 14 42 38.24 | +31 59 38.9 | – | z | 108 |
| 1999-05-16 20:39:09 | C | 14 42 38.05 | +31 59 45.1 | – | z | 108 |
| 1999-05-16 20:47:18 | C | 14 42 37.44 | +31 59 53.7 | – | z | 108 |
| 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 |