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 |
|---|---|---|---|---|---|---|
| 2017-04-23 10:09:45 | C | 20 21 50.69 | +03 12 11.7 | – | q | 703 |
| 2017-04-23 10:20:34 | C | 20 21 53.14 | +03 12 17.5 | – | q | 703 |
| 2017-04-23 10:31:06 | C | 20 21 55.54 | +03 12 23.0 | – | q | 703 |
| 2017-04-23 10:40:54 | C | 20 21 57.65 | +03 12 26.8 | – | q | 703 |
| 2017-04-29 02:02:55 | C | 20 53 24.17 | +04 21 29.4 | – | q | 160 |
| 2017-04-29 02:04:51 | C | 20 53 24.61 | +04 21 30.3 | – | q | 160 |
| 2017-04-29 02:06:47 | C | 20 53 25.08 | +04 21 31.2 | – | q | 160 |
| 2017-05-01 10:48:26 | C | 21 06 53.07 | +04 49 13.5 | – | q | 703 |
| 2017-05-01 10:55:26 | C | 21 06 54.73 | +04 49 16.8 | – | q | 703 |
| 2017-05-01 11:02:26 | C | 21 06 56.37 | +04 49 20.1 | – | q | 703 |
| 2017-05-01 11:09:25 | C | 21 06 58.02 | +04 49 23.5 | – | q | 703 |
| 2017-05-04 10:21:59 | C | 21 24 03.42 | +05 22 35.8 | – | q | 703 |
| 2017-05-04 10:29:01 | C | 21 24 05.12 | +05 22 39.1 | – | q | 703 |
| 2017-05-04 10:36:01 | C | 21 24 06.79 | +05 22 42.1 | – | q | 703 |
| 2017-05-04 10:43:01 | C | 21 24 08.45 | +05 22 45.3 | – | q | 703 |
| 2017-05-31 04:17:04 | C | 23 54 24.05 | +08 28 55.8 | – | o | Z22 |
| 2017-05-31 04:32:49 | C | 23 54 27.56 | +08 28 58.2 | – | o | Z22 |
| 2017-07-07 01:38:43 | C | 02 29 57.21 | +08 24 02.6 | – | q | 160 |
| 2017-07-07 01:40:46 | C | 02 29 57.53 | +08 24 02.6 | – | q | 160 |
| 2017-07-07 01:42:48 | C | 02 29 57.82 | +08 24 02.3 | – | q | 160 |
| 2017-07-15 02:33:27 | C | 02 55 08.01 | +08 00 35.8 | – | q | 160 |
| 2017-07-15 02:35:30 | C | 02 55 08.28 | +08 00 35.8 | – | q | 160 |
| 2017-07-15 02:37:33 | C | 02 55 08.54 | +08 00 36.4 | – | q | 160 |
| 2017-07-18 02:14:12 | C | 03 03 46.86 | +07 50 03.4 | – | q | 160 |
| 2017-07-18 02:16:15 | C | 03 03 47.05 | +07 50 03.5 | – | q | 160 |
| 2017-07-18 02:18:17 | C | 03 03 47.32 | +07 50 03.9 | – | q | 160 |
| 2017-07-19 02:23:22 | C | 03 06 36.61 | +07 46 15.0 | – | q | 160 |
| 2017-07-19 02:25:19 | C | 03 06 36.84 | +07 46 14.4 | – | q | 160 |
| 2017-07-19 02:27:17 | C | 03 06 37.07 | +07 46 14.5 | – | q | 160 |
| 2017-08-16 02:29:09 | C | 04 08 36.56 | +05 11 09.1 | – | q | 160 |
| 2017-08-16 02:31:07 | C | 04 08 36.71 | +05 11 08.5 | – | q | 160 |
| 2017-08-16 02:33:05 | C | 04 08 36.82 | +05 11 07.7 | – | q | 160 |
| 2017-08-17 01:56:59 | C | 04 10 11.95 | +05 04 00.4 | – | q | 160 |
| 2017-08-17 01:58:55 | C | 04 10 12.13 | +05 03 59.7 | – | q | 160 |
| 2017-08-17 02:00:53 | C | 04 10 12.23 | +05 03 59.3 | – | q | 160 |
| 2017-08-18 02:44:47 | C | 04 11 50.08 | +04 56 20.8 | – | q | 160 |
| 2017-08-18 02:45:58 | C | 04 11 50.15 | +04 56 20.3 | – | q | 160 |
| 2017-08-23 03:00:01 | C | 04 19 08.23 | +04 17 22.9 | – | q | 160 |
| 2017-08-23 03:02:08 | C | 04 19 08.36 | +04 17 22.7 | – | q | 160 |
| 2017-08-23 03:04:15 | C | 04 19 08.48 | +04 17 21.8 | – | q | 160 |
| 2017-08-27 22:58:01 | S | 04 25 09.60 | +03 37 13.3 | – | L | C51 |
| 2017-08-27 22:58:12 | S | 04 25 09.62 | +03 37 13.5 | – | L | C51 |
| 2017-08-28 02:06:42 | S | 04 25 18.59 | +03 36 05.8 | – | L | C51 |
| 2017-08-28 05:15:12 | S | 04 25 27.49 | +03 34 58.2 | – | L | C51 |
| 2017-08-28 08:23:42 | S | 04 25 36.38 | +03 33 50.4 | – | L | C51 |
| 2017-08-28 11:32:23 | S | 04 25 45.21 | +03 32 42.5 | – | L | C51 |
| 2017-08-28 13:06:38 | S | 04 25 49.61 | +03 32 08.6 | – | L | C51 |
| 2017-08-28 14:40:53 | S | 04 25 54.00 | +03 31 34.5 | – | L | C51 |
| 2017-08-28 16:15:09 | S | 04 25 58.38 | +03 31 00.7 | – | L | C51 |
| 2017-08-28 17:49:24 | S | 04 26 02.73 | +03 30 26.5 | – | L | C51 |
| 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 |