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 |
|---|---|---|---|---|---|---|
| 2007-03-11 06:51:08 | C | 09 09 47.16 | +19 14 57.0 | – | r | G96 |
| 2007-03-20 04:30:56 | C | 09 04 15.63 | +19 47 16.2 | – | r | G96 |
| 2007-03-20 04:40:42 | C | 09 04 15.38 | +19 47 17.4 | – | r | G96 |
| 2007-03-20 04:50:18 | C | 09 04 15.16 | +19 47 18.6 | – | r | G96 |
| 2007-03-20 05:00:01 | C | 09 04 14.98 | +19 47 20.0 | – | r | G96 |
| 2007-12-16 12:21:08 | C | 13 23 59.17 | +00 31 30.2 | – | r | G96 |
| 2007-12-16 12:28:29 | C | 13 23 59.71 | +00 31 28.8 | – | r | G96 |
| 2007-12-16 12:35:54 | C | 13 24 00.14 | +00 31 27.2 | – | r | G96 |
| 2007-12-16 12:43:17 | C | 13 24 00.61 | +00 31 25.3 | – | r | G96 |
| 2008-01-19 11:28:31 | C | 14 20 06.90 | -01 28 47.5 | 19.3 | c | 704 |
| 2008-01-19 11:47:03 | C | 14 20 08.23 | -01 28 48.5 | 19.4 | c | 704 |
| 2008-01-19 12:05:33 | C | 14 20 09.51 | -01 28 49.3 | 19.8 | c | 704 |
| 2008-01-19 12:24:11 | C | 14 20 10.79 | -01 28 50.6 | 19.1 | c | 704 |
| 2008-02-07 11:05:56 | C | 14 53 37.02 | -01 30 41.6 | 18.8 | c | 704 |
| 2008-02-07 11:41:47 | C | 14 53 39.81 | -01 30 37.7 | 18.7 | c | 704 |
| 2008-02-07 11:59:28 | C | 14 53 41.10 | -01 30 37.2 | 19.1 | c | 704 |
| 2008-03-04 11:56:17 | C | 15 43 22.87 | +00 28 07.0 | – | r | 703 |
| 2008-03-04 12:09:03 | C | 15 43 24.02 | +00 28 11.5 | – | r | 703 |
| 2008-03-04 12:21:54 | C | 15 43 24.92 | +00 28 15.1 | – | r | 703 |
| 2008-03-04 12:34:25 | C | 15 43 26.04 | +00 28 19.2 | – | r | 703 |
| 2008-03-19 08:01:43 | C | 16 15 08.72 | +03 03 38.0 | 17.4 | c | 704 |
| 2008-03-19 08:16:56 | C | 16 15 10.12 | +03 03 46.4 | 17.5 | c | 704 |
| 2008-03-19 08:32:09 | C | 16 15 11.54 | +03 03 54.5 | 17.5 | c | 704 |
| 2008-03-19 08:47:45 | C | 16 15 12.99 | +03 04 03.3 | 17.7 | c | 704 |
| 2008-03-19 09:03:10 | C | 16 15 14.38 | +03 04 10.6 | 17.8 | c | 704 |
| 2008-03-20 08:17:24 | C | 16 17 26.95 | +03 17 04.5 | – | r | H45 |
| 2008-03-20 08:19:07 | C | 16 17 27.11 | +03 17 05.9 | – | r | H45 |
| 2008-03-20 08:32:08 | C | 16 17 28.33 | +03 17 13.3 | – | r | H45 |
| 2008-03-20 08:33:42 | C | 16 17 28.48 | +03 17 14.3 | – | r | H45 |
| 2008-03-20 08:35:42 | C | 16 17 28.68 | +03 17 15.3 | – | r | H45 |
| 2008-03-20 12:09:53 | C | 16 17 48.76 | +03 19 16.2 | – | r | 448 |
| 2008-03-20 12:12:59 | C | 16 17 49.03 | +03 19 18.0 | – | r | 448 |
| 2008-03-20 12:16:04 | C | 16 17 49.33 | +03 19 20.0 | – | r | 448 |
| 2008-03-20 12:19:09 | C | 16 17 49.61 | +03 19 21.8 | – | r | 448 |
| 2008-03-20 12:22:14 | C | 16 17 49.90 | +03 19 23.5 | – | r | 448 |
| 2008-03-27 10:34:55 | C | 16 34 19.89 | +05 03 05.5 | – | r | 683 |
| 2008-03-27 10:54:15 | C | 16 34 21.80 | +05 03 17.9 | – | r | 683 |
| 2008-03-27 11:13:35 | C | 16 34 23.74 | +05 03 31.8 | – | r | 683 |
| 2008-04-02 08:31:00 | C | 16 49 32.22 | +06 47 57.0 | 16.8 | c | 704 |
| 2008-04-02 08:47:46 | C | 16 49 34.10 | +06 48 10.1 | 17.0 | c | 704 |
| 2008-04-02 09:04:27 | C | 16 49 35.91 | +06 48 24.2 | 17.0 | c | 704 |
| 2008-04-02 09:21:10 | C | 16 49 37.72 | +06 48 37.0 | 17.0 | c | 704 |
| 2008-04-02 09:37:52 | C | 16 49 39.55 | +06 48 50.4 | 17.2 | c | 704 |
| 2008-04-13 09:43:05 | C | 17 21 50.97 | +10 47 12.3 | – | r | 703 |
| 2008-04-13 09:51:02 | C | 17 21 52.02 | +10 47 20.6 | – | r | 703 |
| 2008-04-13 09:58:46 | C | 17 21 53.02 | +10 47 28.5 | – | r | 703 |
| 2008-04-13 10:06:36 | C | 17 21 54.03 | +10 47 36.3 | – | r | 703 |
| 2008-04-15 06:27:26 | C | 17 27 58.71 | +11 33 12.9 | – | r | H45 |
| 2008-04-15 06:29:31 | C | 17 27 59.01 | +11 33 15.0 | – | r | H45 |
| 2008-04-15 06:31:51 | C | 17 27 59.31 | +11 33 17.7 | – | r | H45 |
| 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 |