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 |
|---|---|---|---|---|---|---|
| 1999-05-17 00:51:36 | C | 14 42 26.72 | +32 04 32.2 | 15.9 | z | 860 |
| 1999-05-17 01:01:36 | C | 14 42 26.21 | +32 04 42.9 | 15.9 | z | 860 |
| 1999-05-17 01:09:04 | C | 14 42 25.86 | +32 04 50.8 | 16.0 | z | 860 |
| 1999-05-17 01:15:10 | C | 14 42 25.56 | +32 04 57.0 | 15.8 | z | 860 |
| 1999-05-17 04:22:29 | C | 14 42 16.96 | +32 07 59.8 | – | c | 761 |
| 1999-05-17 04:42:15 | C | 14 42 15.95 | +32 08 20.7 | – | c | 761 |
| 1999-05-17 04:59:57 | C | 14 42 15.58 | +32 08 35.9 | 17.3 | a | 704 |
| 1999-05-17 05:17:32 | C | 14 42 14.65 | +32 08 54.3 | – | a | 704 |
| 1999-05-17 05:35:07 | C | 14 42 13.82 | +32 09 12.0 | – | a | 704 |
| 1999-05-17 05:52:46 | C | 14 42 12.88 | +32 09 30.3 | – | a | 704 |
| 1999-05-17 06:10:21 | C | 14 42 12.04 | +32 09 49.7 | – | a | 704 |
| 1999-05-17 14:02:48 | C | 14 41 50.92 | +32 18 20.9 | – | – | 426 |
| 1999-05-17 14:08:20 | C | 14 41 50.65 | +32 18 26.7 | – | – | 426 |
| 1999-05-17 14:14:17 | C | 14 41 50.35 | +32 18 32.8 | – | – | 426 |
| 1999-05-17 15:20:50 | C | 14 41 47.01 | +32 19 22.1 | – | z | 903 |
| 1999-05-17 15:30:09 | C | 14 41 47.04 | +32 19 50.2 | – | i | 321 |
| 1999-05-17 15:33:04 | C | 14 41 46.93 | +32 19 54.2 | – | i | 321 |
| 1999-05-17 15:35:57 | C | 14 41 46.79 | +32 19 56.2 | – | i | 321 |
| 1999-05-17 15:53:39 | C | 14 41 45.41 | +32 19 55.0 | – | z | 903 |
| 1999-05-17 22:27:45 | C | 14 41 28.34 | +32 26 39.0 | – | c | 636 |
| 1999-05-17 22:50:39 | C | 14 41 27.21 | +32 27 02.7 | – | c | 636 |
| 1999-05-17 22:57:00 | C | 14 41 26.90 | +32 27 09.5 | – | c | 636 |
| 1999-05-18 02:41:53 | C | 14 41 17.56 | +32 31 04.0 | – | i | 739 |
| 1999-05-18 05:04:57 | C | 14 41 10.85 | +32 33 34.3 | 16.7 | a | 704 |
| 1999-05-18 05:20:53 | C | 14 41 10.07 | +32 33 50.9 | – | a | 704 |
| 1999-05-18 05:37:39 | C | 14 41 09.15 | +32 34 07.4 | – | a | 704 |
| 1999-05-18 05:53:57 | C | 14 41 08.35 | +32 34 24.6 | – | a | 704 |
| 1999-05-18 06:10:29 | C | 14 41 07.53 | +32 34 41.6 | – | a | 704 |
| 1999-05-19 03:33:33 | C | 14 40 09.89 | +32 56 28.3 | – | i | 739 |
| 1999-05-19 03:55:10 | C | 14 40 08.80 | +32 56 50.4 | – | i | 739 |
| 1999-05-19 04:43:00 | C | 14 40 06.37 | +32 57 39.3 | – | i | 739 |
| 1999-05-20 22:14:00 | C | 14 38 11.94 | +33 38 56.1 | – | c | 636 |
| 1999-05-20 22:20:59 | C | 14 38 11.60 | +33 39 02.8 | – | c | 636 |
| 1999-05-20 22:27:59 | C | 14 38 11.24 | +33 39 09.8 | – | c | 636 |
| 1999-05-20 22:34:59 | C | 14 38 10.89 | +33 39 16.6 | – | c | 636 |
| 1999-05-26 21:46:20 | C | 14 31 28.38 | +35 52 08.3 | – | c | 636 |
| 1999-05-26 21:52:50 | C | 14 31 28.05 | +35 51 55.6 | – | c | 636 |
| 1999-05-26 21:54:38 | C | 14 31 28.41 | +35 52 04.4 | – | z | 127 |
| 1999-05-26 22:01:47 | C | 14 31 28.02 | +35 52 11.0 | – | z | 127 |
| 1999-05-26 22:09:50 | C | 14 31 27.61 | +35 52 18.1 | – | z | 127 |
| 1999-05-27 19:56:10 | C | 14 30 26.61 | +36 11 07.6 | – | c | 118 |
| 1999-05-27 19:58:28 | C | 14 30 26.50 | +36 11 09.6 | – | c | 118 |
| 1999-05-27 20:03:04 | C | 14 30 26.24 | +36 11 13.5 | – | c | 118 |
| 1999-05-27 22:00:02 | C | 14 30 20.35 | +36 12 52.8 | – | z | 127 |
| 1999-05-27 22:06:00 | C | 14 30 20.03 | +36 12 58.0 | – | z | 127 |
| 1999-06-02 02:35:34 | C | 14 24 32.53 | +37 53 58.2 | – | i | 739 |
| 1999-06-02 02:41:21 | C | 14 24 32.21 | +37 54 02.6 | – | i | 739 |
| 1999-06-02 02:46:52 | C | 14 24 31.92 | +37 54 07.0 | – | i | 739 |
| 1999-06-02 02:52:41 | C | 14 24 31.61 | +37 54 11.5 | – | i | 739 |
| 1999-06-04 07:55:09 | C | 14 22 04.31 | +38 34 02.7 | 15.9 | a | 704 |
| 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 |