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 |
|---|---|---|---|---|---|---|
| 1999-06-04 08:06:34 | C | 14 22 03.71 | +38 34 10.7 | – | a | 704 |
| 1999-06-04 08:17:56 | C | 14 22 03.21 | +38 34 18.3 | – | a | 704 |
| 1999-06-04 08:29:17 | C | 14 22 02.61 | +38 34 26.5 | – | a | 704 |
| 1999-06-04 08:40:38 | C | 14 22 02.05 | +38 34 34.6 | – | a | 704 |
| 1999-06-04 12:58:14 | C | 14 21 51.77 | +38 37 49.8 | – | – | 360 |
| 1999-06-04 13:01:14 | C | 14 21 51.62 | +38 37 52.0 | – | – | 360 |
| 1999-06-04 13:03:14 | C | 14 21 51.52 | +38 37 53.4 | – | – | 360 |
| 1999-06-07 04:14:42 | C | 14 19 01.79 | +39 23 04.7 | 15.5 | a | 704 |
| 1999-06-07 04:29:34 | C | 14 19 01.03 | +39 23 15.1 | – | a | 704 |
| 1999-06-07 04:43:38 | C | 14 19 00.30 | +39 23 24.8 | – | a | 704 |
| 1999-06-07 04:57:41 | C | 14 18 59.54 | +39 23 34.7 | – | a | 704 |
| 1999-06-07 05:11:44 | C | 14 18 58.83 | +39 23 44.4 | – | a | 704 |
| 1999-06-08 13:33:44 | C | 14 17 33.17 | +39 46 05.6 | – | – | 360 |
| 1999-06-08 13:36:45 | C | 14 17 33.01 | +39 46 07.6 | – | – | 360 |
| 1999-06-08 13:39:14 | C | 14 17 32.88 | +39 46 09.2 | – | – | 360 |
| 1999-06-08 21:40:50 | C | 14 17 12.12 | +39 51 30.2 | – | c | 636 |
| 1999-06-08 21:46:40 | C | 14 17 11.82 | +39 51 34.2 | – | c | 636 |
| 1999-06-08 21:52:50 | C | 14 17 11.54 | +39 51 38.1 | – | c | 636 |
| 1999-06-08 21:59:30 | C | 14 17 11.21 | +39 51 42.4 | – | c | 636 |
| 1999-06-09 21:54:12 | C | 14 16 08.86 | +40 07 50.4 | – | z | 127 |
| 1999-06-09 22:00:02 | C | 14 16 08.57 | +40 07 54.1 | – | z | 127 |
| 1999-06-09 22:06:48 | C | 14 16 08.25 | +40 07 58.6 | – | z | 127 |
| 1999-06-09 22:18:34 | C | 14 16 07.71 | +40 08 06.6 | – | c | 636 |
| 1999-06-09 22:24:10 | C | 14 16 07.41 | +40 08 10.6 | – | c | 636 |
| 1999-06-09 22:29:20 | C | 14 16 07.19 | +40 08 13.6 | – | c | 636 |
| 1999-06-09 22:37:30 | C | 14 16 06.78 | +40 08 19.0 | – | c | 636 |
| 1999-06-10 04:00:46 | C | 14 15 53.64 | +40 12 03.8 | 16.0 | a | 704 |
| 1999-06-10 04:22:17 | C | 14 15 52.51 | +40 12 17.9 | – | a | 704 |
| 1999-06-10 04:43:42 | C | 14 15 51.40 | +40 12 31.9 | – | a | 704 |
| 1999-06-10 05:05:03 | C | 14 15 50.29 | +40 12 46.2 | – | a | 704 |
| 1999-06-10 05:26:27 | C | 14 15 49.22 | +40 12 59.9 | – | a | 704 |
| 1999-06-11 04:05:31 | C | 14 14 51.66 | +40 28 02.7 | 15.6 | a | 704 |
| 1999-06-11 04:24:01 | C | 14 14 50.73 | +40 28 15.0 | – | a | 704 |
| 1999-06-11 04:42:31 | C | 14 14 49.75 | +40 28 26.9 | – | a | 704 |
| 1999-06-11 05:01:12 | C | 14 14 48.78 | +40 28 39.1 | – | a | 704 |
| 1999-06-11 05:19:43 | C | 14 14 47.85 | +40 28 51.1 | – | a | 704 |
| 1999-06-15 22:24:55 | C | 14 10 04.60 | +41 41 53.8 | – | c | 636 |
| 1999-06-15 22:31:20 | C | 14 10 04.30 | +41 41 57.6 | – | c | 636 |
| 1999-06-15 22:36:50 | C | 14 10 04.04 | +41 42 01.3 | – | c | 636 |
| 1999-06-15 22:43:14 | C | 14 10 03.74 | +41 42 05.0 | – | c | 636 |
| 1999-06-16 22:07:09 | C | 14 09 06.58 | +41 57 07.6 | – | c | 636 |
| 1999-06-16 22:13:29 | C | 14 09 06.29 | +41 57 11.3 | – | c | 636 |
| 1999-06-16 22:20:29 | C | 14 09 05.96 | +41 57 15.7 | – | c | 636 |
| 1999-06-18 22:00:05 | C | 14 07 09.83 | +42 28 06.8 | – | c | 636 |
| 1999-06-18 22:06:44 | C | 14 07 09.52 | +42 28 10.9 | – | c | 636 |
| 1999-06-18 22:12:55 | C | 14 07 09.22 | +42 28 14.8 | – | c | 636 |
| 1999-06-18 22:20:04 | C | 14 07 08.89 | +42 28 19.2 | – | c | 636 |
| 1999-06-19 22:03:35 | C | 14 06 11.11 | +42 43 54.1 | – | c | 636 |
| 1999-06-19 22:10:19 | C | 14 06 10.81 | +42 43 58.3 | – | c | 636 |
| 1999-06-19 22:16:55 | C | 14 06 10.50 | +42 44 02.4 | – | c | 636 |
| 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 |