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 |
|---|---|---|---|---|---|---|
| 2008-05-27 08:45:57 | C | 21 39 07.77 | +29 06 17.4 | 16.5 | c | 704 |
| 2008-05-27 09:02:47 | C | 21 39 14.01 | +29 06 20.0 | 16.5 | c | 704 |
| 2008-05-27 09:19:09 | C | 21 39 20.01 | +29 06 22.3 | 16.3 | c | 704 |
| 2008-05-27 09:33:57 | C | 21 39 25.39 | +29 06 24.9 | 16.2 | c | 704 |
| 2008-05-27 09:50:02 | C | 21 39 31.29 | +29 06 27.4 | 16.4 | c | 704 |
| 2008-07-01 10:24:14 | C | 01 49 07.89 | +16 41 55.5 | – | r | 703 |
| 2008-07-01 10:28:56 | C | 01 49 08.76 | +16 41 50.8 | – | r | 703 |
| 2008-07-01 10:33:40 | C | 01 49 09.66 | +16 41 45.8 | – | r | 703 |
| 2008-07-01 10:38:25 | C | 01 49 10.56 | +16 41 40.9 | – | r | 703 |
| 2008-08-28 10:26:43 | C | 04 16 44.07 | +00 36 25.9 | – | r | H45 |
| 2008-08-28 10:27:41 | C | 04 16 44.11 | +00 36 25.3 | – | r | H45 |
| 2008-08-28 10:28:43 | C | 04 16 44.14 | +00 36 24.7 | – | r | H45 |
| 2008-08-28 10:29:46 | C | 04 16 44.18 | +00 36 24.2 | – | r | H45 |
| 2008-08-28 10:30:46 | C | 04 16 44.22 | +00 36 23.5 | – | r | H45 |
| 2008-09-22 23:38:46 | C | 04 23 36.91 | -05 14 07.0 | 16.4 | r | 084 |
| 2008-09-22 23:40:58 | C | 04 23 36.84 | -05 14 08.0 | 16.8 | r | 084 |
| 2008-10-01 00:25:18 | C | 04 18 25.28 | -06 56 22.9 | 17.2 | r | 084 |
| 2008-10-01 00:27:30 | C | 04 18 25.13 | -06 56 23.5 | 16.6 | r | 084 |
| 2008-10-01 10:01:31 | C | 04 18 04.46 | -07 01 08.5 | – | r | 703 |
| 2008-10-01 10:12:50 | C | 04 18 04.03 | -07 01 14.1 | – | r | 703 |
| 2008-10-01 10:24:15 | C | 04 18 03.56 | -07 01 20.3 | – | r | 703 |
| 2008-10-01 10:35:43 | C | 04 18 03.13 | -07 01 26.0 | – | r | 703 |
| 2008-10-06 02:11:32 | C | 04 13 26.36 | -07 54 55.5 | 17.2 | i | 071 |
| 2008-10-08 01:20:15 | C | 04 11 11.77 | -08 15 54.5 | 17.4 | o | 084 |
| 2008-10-08 01:22:28 | C | 04 11 11.60 | -08 15 55.5 | 17.0 | o | 084 |
| 2008-10-08 03:23:00 | C | 04 11 05.38 | -08 16 46.1 | 17.5 | i | 071 |
| 2008-10-09 02:55:42 | C | 04 09 54.36 | -08 26 49.8 | 17.2 | o | 084 |
| 2008-10-09 02:57:54 | C | 04 09 54.24 | -08 26 51.1 | 17.9 | r | 084 |
| 2008-10-09 10:18:58 | C | 04 09 31.71 | -08 29 52.3 | – | r | 703 |
| 2008-10-09 10:23:13 | C | 04 09 31.50 | -08 29 54.5 | – | r | 703 |
| 2008-10-09 10:30:50 | C | 04 09 31.10 | -08 29 57.5 | – | r | 703 |
| 2008-10-09 10:35:09 | C | 04 09 30.85 | -08 29 59.5 | – | r | 703 |
| 2008-10-09 10:42:42 | C | 04 09 30.45 | -08 30 02.2 | – | r | 703 |
| 2008-10-09 10:47:05 | C | 04 09 30.20 | -08 30 04.5 | – | r | 703 |
| 2008-10-09 10:54:40 | C | 04 09 29.80 | -08 30 07.5 | – | r | 703 |
| 2008-10-09 10:59:02 | C | 04 09 29.52 | -08 30 09.8 | – | r | 703 |
| 2008-10-12 03:05:47 | C | 04 06 02.40 | -08 55 42.7 | – | r | J51 |
| 2008-10-12 03:13:41 | C | 04 06 01.94 | -08 55 45.9 | – | r | J51 |
| 2008-10-12 03:21:36 | C | 04 06 01.48 | -08 55 49.1 | – | r | J51 |
| 2008-10-19 09:59:00 | C | 03 55 25.01 | -09 52 47.5 | – | o | H68 |
| 2008-10-19 10:01:47 | C | 03 55 24.82 | -09 52 47.9 | – | o | H68 |
| 2008-10-19 10:03:59 | C | 03 55 24.67 | -09 52 48.8 | – | o | H68 |
| 2008-10-19 10:06:12 | C | 03 55 24.52 | -09 52 49.0 | – | o | H68 |
| 2008-10-19 10:12:51 | C | 03 55 24.06 | -09 52 51.1 | – | o | H68 |
| 2008-10-19 10:15:04 | C | 03 55 23.92 | -09 52 51.2 | – | o | H68 |
| 2008-10-19 10:19:30 | C | 03 55 23.61 | -09 52 52.6 | – | o | H68 |
| 2008-10-19 10:31:53 | C | 03 55 22.80 | -09 52 55.9 | – | o | H68 |
| 2008-10-26 09:38:59 | C | 03 44 09.60 | -10 27 30.6 | – | r | 703 |
| 2008-10-26 09:51:21 | C | 03 44 08.73 | -10 27 32.2 | – | r | 703 |
| 2008-10-26 10:03:42 | C | 03 44 07.83 | -10 27 34.3 | – | r | 703 |
| 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 |