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 |
|---|---|---|---|---|---|---|
| 2008-04-15 06:33:27 | C | 17 27 59.54 | +11 33 19.2 | – | r | H45 |
| 2008-04-15 06:34:18 | C | 17 27 59.66 | +11 33 20.1 | – | r | H45 |
| 2008-04-15 16:43:51 | C | 17 29 24.80 | +11 44 02.2 | – | m | 379 |
| 2008-04-15 16:50:14 | C | 17 29 25.66 | +11 44 09.2 | – | m | 379 |
| 2008-04-15 16:58:50 | C | 17 29 26.85 | +11 44 17.9 | – | m | 379 |
| 2008-04-15 17:02:03 | C | 17 29 27.32 | +11 44 21.3 | – | m | 379 |
| 2008-04-15 17:05:15 | C | 17 29 27.74 | +11 44 25.2 | – | m | 379 |
| 2008-04-15 17:32:02 | C | 17 29 31.43 | +11 44 53.4 | – | m | 379 |
| 2008-04-19 03:49:29 | C | 17 41 33.36 | +13 14 27.9 | – | r | B19 |
| 2008-04-19 03:51:44 | C | 17 41 33.66 | +13 14 30.5 | – | r | B19 |
| 2008-04-19 03:53:59 | C | 17 41 33.99 | +13 14 32.8 | – | r | B19 |
| 2008-04-25 08:04:18 | C | 18 05 51.55 | +16 08 46.7 | 16.0 | c | 704 |
| 2008-04-25 08:18:23 | C | 18 05 54.02 | +16 09 04.4 | 16.4 | c | 704 |
| 2008-04-25 08:32:27 | C | 18 05 56.44 | +16 09 21.8 | 16.1 | c | 704 |
| 2008-04-25 08:46:21 | C | 18 05 58.85 | +16 09 38.9 | 16.3 | c | 704 |
| 2008-04-25 09:01:17 | C | 18 06 01.43 | +16 09 57.4 | 16.4 | c | 704 |
| 2008-04-26 02:59:38 | C | 18 09 13.87 | +16 32 04.2 | – | c | B19 |
| 2008-04-26 03:01:20 | C | 18 09 14.17 | +16 32 06.3 | – | c | B19 |
| 2008-04-26 03:03:01 | C | 18 09 14.45 | +16 32 08.5 | – | c | B19 |
| 2008-04-29 08:22:24 | C | 18 23 49.59 | +18 09 21.3 | – | r | H45 |
| 2008-04-29 08:24:58 | C | 18 23 50.08 | +18 09 24.7 | – | r | H45 |
| 2008-04-29 08:27:36 | C | 18 23 50.59 | +18 09 28.0 | – | r | H45 |
| 2008-04-29 08:29:10 | C | 18 23 50.90 | +18 09 30.1 | – | r | H45 |
| 2008-04-29 08:32:23 | C | 18 23 51.51 | +18 09 34.2 | – | r | H45 |
| 2008-04-30 08:22:16 | C | 18 28 37.09 | +18 40 02.7 | – | r | H45 |
| 2008-04-30 08:25:31 | C | 18 28 37.74 | +18 40 06.9 | – | r | H45 |
| 2008-04-30 08:27:04 | C | 18 28 38.05 | +18 40 09.0 | – | r | H45 |
| 2008-04-30 08:28:48 | C | 18 28 38.39 | +18 40 11.2 | – | r | H45 |
| 2008-04-30 08:30:21 | C | 18 28 38.69 | +18 40 13.2 | – | r | H45 |
| 2008-05-01 03:12:43 | C | 18 32 28.09 | +19 04 14.8 | – | r | B19 |
| 2008-05-01 03:16:39 | C | 18 32 28.89 | +19 04 19.5 | – | r | B19 |
| 2008-05-01 03:20:36 | C | 18 32 29.71 | +19 04 24.6 | – | r | B19 |
| 2008-05-01 21:59:10 | C | 18 36 24.48 | +19 28 24.1 | – | o | A92 |
| 2008-05-01 22:03:07 | C | 18 36 25.32 | +19 28 29.8 | – | o | A92 |
| 2008-05-01 22:09:03 | C | 18 36 26.57 | +19 28 37.5 | – | o | A92 |
| 2008-05-01 22:15:48 | C | 18 36 27.98 | +19 28 46.1 | – | o | A92 |
| 2008-05-01 22:20:03 | C | 18 36 28.87 | +19 28 51.7 | – | o | A92 |
| 2008-05-01 22:25:33 | C | 18 36 30.01 | +19 28 58.6 | – | o | A92 |
| 2008-05-01 22:28:00 | C | 18 36 30.50 | +19 29 02.5 | – | o | A92 |
| 2008-05-05 08:45:04 | C | 18 54 47.63 | +21 15 35.8 | – | r | H45 |
| 2008-05-05 08:46:28 | C | 18 54 47.95 | +21 15 37.6 | – | r | H45 |
| 2008-05-05 08:48:03 | C | 18 54 48.32 | +21 15 39.8 | – | r | H45 |
| 2008-05-05 08:51:00 | C | 18 54 48.99 | +21 15 43.6 | – | r | H45 |
| 2008-05-05 08:53:25 | C | 18 54 49.54 | +21 15 46.7 | – | r | H45 |
| 2008-05-09 23:55:21 | C | 19 22 32.51 | +23 36 17.3 | – | r | B67 |
| 2008-05-10 00:09:36 | C | 19 22 36.26 | +23 36 35.0 | – | r | B67 |
| 2008-05-10 00:22:10 | C | 19 22 39.54 | +23 36 50.8 | – | r | B67 |
| 2008-05-23 02:44:57 | C | 21 01 44.05 | +28 33 30.1 | – | r | J51 |
| 2008-05-23 02:48:36 | C | 21 01 45.35 | +28 33 32.4 | – | r | J51 |
| 2008-05-23 02:53:50 | C | 21 01 47.21 | +28 33 35.5 | – | r | J51 |
| 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 |