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 |
|---|---|---|---|---|---|---|
| 2017-04-11 11:28:01 | S | 19 19 58.36 | +00 44 15.8 | – | L | C51 |
| 2017-04-11 14:36:31 | S | 19 20 36.59 | +00 45 49.6 | – | L | C51 |
| 2017-04-11 17:45:12 | S | 19 21 14.90 | +00 47 23.8 | – | L | C51 |
| 2017-04-11 20:53:43 | S | 19 21 53.24 | +00 48 58.0 | – | L | C51 |
| 2017-04-12 00:02:13 | S | 19 22 31.65 | +00 50 32.3 | – | L | C51 |
| 2017-04-12 03:10:53 | S | 19 23 10.138 | +00 52 06.85 | – | L | C51 |
| 2017-04-12 06:19:23 | S | 19 23 48.63 | +00 53 41.3 | – | L | C51 |
| 2017-04-12 09:28:04 | S | 19 24 27.25 | +00 55 16.1 | – | L | C51 |
| 2017-04-12 12:36:35 | S | 19 25 05.86 | +00 56 50.8 | – | L | C51 |
| 2017-04-12 15:45:16 | S | 19 25 44.58 | +00 58 25.9 | – | L | C51 |
| 2017-04-12 18:53:46 | S | 19 26 23.32 | +01 00 00.8 | – | L | C51 |
| 2017-04-12 22:02:16 | S | 19 27 02.11 | +01 01 35.8 | – | L | C51 |
| 2017-04-13 01:10:57 | S | 19 27 41.00 | +01 03 11.3 | – | L | C51 |
| 2017-04-13 02:45:12 | S | 19 28 00.44 | +01 03 58.9 | – | L | C51 |
| 2017-04-13 05:53:42 | S | 19 28 39.38 | +01 05 34.2 | – | L | C51 |
| 2017-04-13 05:53:53 | S | 19 28 39.42 | +01 05 34.6 | – | L | C51 |
| 2017-04-13 07:28:08 | S | 19 28 58.90 | +01 06 22.2 | – | L | C51 |
| 2017-04-13 09:02:23 | S | 19 29 18.40 | +01 07 09.9 | – | L | C51 |
| 2017-04-13 10:36:39 | S | 19 29 37.93 | +01 07 57.6 | – | L | C51 |
| 2017-04-13 12:10:54 | S | 19 29 57.44 | +01 08 45.4 | – | L | C51 |
| 2017-04-13 13:45:20 | S | 19 30 17.03 | +01 09 33.6 | – | L | C51 |
| 2017-04-13 15:19:35 | S | 19 30 36.60 | +01 10 21.4 | – | L | C51 |
| 2017-04-13 18:28:04 | S | 19 31 15.76 | +01 11 57.1 | – | L | C51 |
| 2017-04-13 20:02:30 | S | 19 31 35.40 | +01 12 45.3 | – | L | C51 |
| 2017-04-13 21:36:45 | S | 19 31 55.01 | +01 13 33.3 | – | L | C51 |
| 2017-04-13 23:11:01 | S | 19 32 14.645 | +01 14 21.34 | – | L | C51 |
| 2017-04-14 02:19:31 | S | 19 32 53.96 | +01 15 57.0 | – | L | C51 |
| 2017-04-14 02:19:42 | S | 19 32 53.98 | +01 15 57.4 | – | L | C51 |
| 2017-04-14 03:53:57 | S | 19 33 13.65 | +01 16 45.5 | – | L | C51 |
| 2017-04-14 05:28:12 | S | 19 33 33.34 | +01 17 33.6 | – | L | C51 |
| 2017-04-14 07:02:27 | S | 19 33 53.04 | +01 18 21.6 | – | L | C51 |
| 2017-04-14 10:10:57 | S | 19 34 32.479 | +01 19 57.90 | – | L | C51 |
| 2017-04-14 10:11:08 | S | 19 34 32.527 | +01 19 58.22 | – | L | C51 |
| 2017-04-14 13:19:38 | S | 19 35 12.01 | +01 21 34.5 | – | L | C51 |
| 2017-04-14 16:28:08 | S | 19 35 51.562 | +01 23 10.93 | – | L | C51 |
| 2017-04-14 19:36:49 | S | 19 36 31.20 | +01 24 47.6 | – | L | C51 |
| 2017-04-14 22:45:19 | S | 19 37 10.79 | +01 26 25.3 | – | L | C51 |
| 2017-04-15 01:54:01 | S | 19 37 50.61 | +01 28 01.2 | – | L | C51 |
| 2017-04-15 05:02:30 | S | 19 38 30.39 | +01 29 38.0 | – | L | C51 |
| 2017-04-15 08:11:00 | S | 19 39 10.22 | +01 31 14.9 | – | L | C51 |
| 2017-04-15 08:11:11 | S | 19 39 10.26 | +01 31 15.1 | – | L | C51 |
| 2017-04-15 11:19:41 | S | 19 39 50.14 | +01 32 52.0 | – | L | C51 |
| 2017-04-15 14:28:12 | S | 19 40 30.07 | +01 34 29.0 | – | L | C51 |
| 2017-04-15 17:36:53 | S | 19 41 10.11 | +01 36 06.5 | – | L | C51 |
| 2017-04-21 02:23:29 | C | 20 09 15.35 | +02 43 04.5 | – | q | 160 |
| 2017-04-21 02:24:35 | C | 20 09 15.59 | +02 43 04.8 | – | q | 160 |
| 2017-04-21 02:25:41 | C | 20 09 15.85 | +02 43 04.4 | – | q | 160 |
| 2017-04-22 02:16:38 | C | 20 14 37.08 | +02 55 32.7 | – | q | 160 |
| 2017-04-22 02:18:36 | C | 20 14 37.51 | +02 55 33.8 | – | q | 160 |
| 2017-04-22 02:20:35 | C | 20 14 37.96 | +02 55 34.6 | – | q | 160 |
| 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 |