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 |
|---|---|---|---|---|---|---|
| 2017-08-28 19:23:38 | S | 04 26 07.09 | +03 29 52.6 | – | L | C51 |
| 2017-08-28 19:23:50 | S | 04 26 07.10 | +03 29 52.6 | – | L | C51 |
| 2017-08-28 20:58:05 | S | 04 26 11.43 | +03 29 18.5 | – | L | C51 |
| 2017-08-28 22:32:19 | S | 04 26 15.77 | +03 28 44.3 | – | L | C51 |
| 2017-08-29 01:40:49 | S | 04 26 24.406 | +03 27 36.18 | – | L | C51 |
| 2017-08-29 04:49:20 | S | 04 26 32.99 | +03 26 27.5 | – | L | C51 |
| 2017-08-29 04:49:30 | S | 04 26 32.98 | +03 26 27.7 | – | L | C51 |
| 2017-08-29 07:58:01 | S | 04 26 41.52 | +03 25 19.2 | – | L | C51 |
| 2017-08-29 11:06:31 | S | 04 26 50.02 | +03 24 10.5 | – | L | C51 |
| 2017-08-31 03:23:07 | C | 04 28 35.36 | +03 09 16.6 | – | q | 160 |
| 2017-08-31 03:25:11 | C | 04 28 35.46 | +03 09 15.9 | – | q | 160 |
| 2017-08-31 03:27:14 | C | 04 28 35.55 | +03 09 15.0 | – | q | 160 |
| 2017-09-12 13:11:37 | C | 04 37 37.51 | +01 12 09.2 | – | L | T08 |
| 2017-09-12 13:21:15 | C | 04 37 37.57 | +01 12 06.9 | – | L | T08 |
| 2017-09-12 13:31:37 | C | 04 37 37.69 | +01 12 02.3 | – | L | T08 |
| 2017-09-12 13:41:08 | C | 04 37 37.89 | +01 11 57.9 | – | L | T08 |
| 2017-09-16 12:54:07 | C | 04 39 01.04 | +00 32 14.2 | – | L | T08 |
| 2017-09-16 13:03:34 | C | 04 39 01.14 | +00 32 09.9 | – | L | T08 |
| 2017-09-16 13:13:54 | C | 04 39 01.22 | +00 32 05.4 | – | L | T08 |
| 2017-09-16 13:23:26 | C | 04 39 01.32 | +00 32 01.4 | – | L | T08 |
| 2017-09-20 11:00:57 | C | 04 39 38.41 | -00 07 44.1 | – | q | 703 |
| 2017-09-20 11:08:47 | C | 04 39 38.44 | -00 07 48.0 | – | q | 703 |
| 2017-09-20 11:16:37 | C | 04 39 38.46 | -00 07 51.2 | – | q | 703 |
| 2017-09-20 11:24:26 | C | 04 39 38.44 | -00 07 54.6 | – | q | 703 |
| 2017-09-20 12:52:37 | C | 04 39 38.88 | -00 08 30.9 | – | L | T08 |
| 2017-09-20 13:02:05 | C | 04 39 38.88 | -00 08 34.4 | – | L | T08 |
| 2017-09-20 13:12:25 | C | 04 39 38.91 | -00 08 37.8 | – | L | T08 |
| 2017-09-20 13:21:57 | C | 04 39 38.91 | -00 08 43.0 | – | L | T08 |
| 2017-09-22 12:50:31 | C | 04 39 40.33 | -00 29 00.7 | – | L | T05 |
| 2017-09-22 13:00:16 | C | 04 39 40.28 | -00 29 04.9 | – | L | T05 |
| 2017-09-22 13:10:46 | C | 04 39 40.26 | -00 29 09.3 | – | L | T05 |
| 2017-09-22 13:20:30 | C | 04 39 40.20 | -00 29 13.6 | – | L | T05 |
| 2017-09-25 10:36:59 | C | 04 39 21.51 | -00 58 53.2 | – | q | 703 |
| 2017-09-25 10:44:54 | C | 04 39 21.39 | -00 58 56.8 | – | q | 703 |
| 2017-09-25 10:52:48 | C | 04 39 21.35 | -00 59 00.2 | – | q | 703 |
| 2017-09-25 11:00:42 | C | 04 39 21.28 | -00 59 03.8 | – | q | 703 |
| 2017-09-28 02:51:26 | C | 04 38 42.53 | -01 26 18.0 | – | q | 160 |
| 2017-09-28 02:53:24 | C | 04 38 42.50 | -01 26 19.0 | – | q | 160 |
| 2017-09-28 02:55:22 | C | 04 38 42.47 | -01 26 20.1 | – | q | 160 |
| 2017-09-28 12:34:22 | C | 04 38 35.03 | -01 30 22.3 | – | L | T08 |
| 2017-09-28 12:44:33 | C | 04 38 34.87 | -01 30 26.7 | – | L | T08 |
| 2017-09-28 12:54:44 | C | 04 38 34.70 | -01 30 31.0 | – | L | T08 |
| 2017-09-28 13:04:54 | C | 04 38 34.56 | -01 30 34.9 | – | L | T08 |
| 2017-09-29 11:21:39 | C | 04 38 14.93 | -01 40 02.7 | – | q | 703 |
| 2017-09-29 11:29:49 | C | 04 38 14.77 | -01 40 06.2 | – | q | 703 |
| 2017-09-29 11:37:49 | C | 04 38 14.62 | -01 40 09.4 | – | q | 703 |
| 2017-09-29 11:45:49 | C | 04 38 14.48 | -01 40 12.9 | – | q | 703 |
| 2017-09-30 12:26:55 | C | 04 37 50.33 | -01 50 35.5 | – | L | T05 |
| 2017-09-30 12:37:31 | C | 04 37 50.11 | -01 50 39.9 | – | L | T05 |
| 2017-09-30 12:47:52 | C | 04 37 49.92 | -01 50 44.3 | – | L | T05 |
| 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 |