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 |
|---|---|---|---|---|---|---|
| 2016-02-10 07:39:40 | C | 09 49 10.61 | +16 27 47.2 | – | q | G96 |
| 2016-02-17 09:20:19 | C | 09 42 52.39 | +17 11 34.2 | – | q | G96 |
| 2016-02-17 09:33:45 | C | 09 42 51.90 | +17 11 37.6 | – | q | G96 |
| 2016-02-17 09:47:09 | C | 09 42 51.34 | +17 11 40.9 | – | q | G96 |
| 2016-02-17 10:00:34 | C | 09 42 50.89 | +17 11 44.4 | – | q | G96 |
| 2016-03-03 13:39:43 | C | 09 29 35.95 | +18 37 44.5 | – | q | D29 |
| 2016-03-03 14:02:37 | C | 09 29 35.08 | +18 37 49.4 | – | q | D29 |
| 2016-03-03 14:25:32 | C | 09 29 34.26 | +18 37 54.5 | – | q | D29 |
| 2017-01-09 12:31:49 | C | 14 37 35.25 | -03 40 01.7 | – | q | G96 |
| 2017-01-09 12:39:23 | C | 14 37 35.90 | -03 40 02.5 | – | q | G96 |
| 2017-01-09 12:45:38 | C | 14 37 36.42 | -03 40 03.7 | – | q | G96 |
| 2017-01-09 12:53:04 | C | 14 37 37.07 | -03 40 05.2 | – | q | G96 |
| 2017-01-31 12:53:45 | C | 15 26 03.06 | -04 50 47.2 | – | q | 703 |
| 2017-01-31 13:00:02 | C | 15 26 03.69 | -04 50 47.7 | – | q | 703 |
| 2017-01-31 13:05:58 | C | 15 26 04.31 | -04 50 47.0 | – | q | 703 |
| 2017-01-31 13:11:43 | C | 15 26 04.94 | -04 50 48.3 | – | q | 703 |
| 2017-02-16 03:56:46 | C | 16 05 05.51 | -05 00 54.7 | – | q | 160 |
| 2017-02-16 03:59:49 | C | 16 05 05.83 | -05 00 55.3 | – | q | 160 |
| 2017-02-18 00:37:09 | S | 16 10 04.399 | -04 59 21.05 | – | L | C51 |
| 2017-02-18 03:45:51 | S | 16 10 25.630 | -04 59 13.49 | – | L | C51 |
| 2017-02-18 06:54:32 | S | 16 10 46.896 | -04 59 05.39 | – | L | C51 |
| 2017-02-18 10:03:02 | S | 16 11 08.155 | -04 58 57.32 | – | L | C51 |
| 2017-02-18 13:11:43 | S | 16 11 29.479 | -04 58 49.26 | – | L | C51 |
| 2017-02-25 10:48:59 | C | 16 30 48.60 | -04 47 00.8 | – | R | G45 |
| 2017-02-25 11:02:48 | C | 16 30 50.24 | -04 46 59.0 | – | R | G45 |
| 2017-02-25 11:10:14 | C | 16 30 51.12 | -04 46 58.9 | – | R | G45 |
| 2017-02-25 11:24:19 | C | 16 30 52.81 | -04 46 57.0 | – | R | G45 |
| 2017-02-26 00:22:11 | S | 16 32 26.39 | -04 45 33.0 | – | L | C51 |
| 2017-02-26 03:30:41 | S | 16 32 49.24 | -04 45 13.4 | – | L | C51 |
| 2017-02-26 06:39:22 | S | 16 33 12.10 | -04 44 53.4 | – | L | C51 |
| 2017-02-26 09:47:52 | S | 16 33 34.99 | -04 44 33.3 | – | L | C51 |
| 2017-02-26 12:56:33 | S | 16 33 57.92 | -04 44 12.6 | – | L | C51 |
| 2017-02-26 16:05:03 | S | 16 34 20.86 | -04 43 52.0 | – | L | C51 |
| 2017-02-26 19:13:44 | S | 16 34 43.84 | -04 43 30.9 | – | L | C51 |
| 2017-02-26 22:22:15 | S | 16 35 06.85 | -04 43 09.9 | – | L | C51 |
| 2017-02-27 01:30:56 | S | 16 35 29.90 | -04 42 48.7 | – | L | C51 |
| 2017-02-27 04:39:26 | S | 16 35 52.970 | -04 42 27.25 | – | L | C51 |
| 2017-02-27 06:13:40 | S | 16 36 04.51 | -04 42 16.5 | – | L | C51 |
| 2017-02-27 06:13:52 | S | 16 36 04.52 | -04 42 16.4 | – | L | C51 |
| 2017-02-27 07:48:06 | S | 16 36 16.06 | -04 42 05.5 | – | L | C51 |
| 2017-02-27 09:22:21 | S | 16 36 27.62 | -04 41 54.5 | – | L | C51 |
| 2017-02-27 10:56:37 | S | 16 36 39.192 | -04 41 43.55 | – | L | C51 |
| 2017-02-27 12:31:03 | S | 16 36 50.79 | -04 41 32.5 | – | L | C51 |
| 2017-02-27 17:13:48 | S | 16 37 25.53 | -04 40 59.1 | – | L | C51 |
| 2017-02-27 18:48:14 | S | 16 37 37.16 | -04 40 47.8 | – | L | C51 |
| 2017-02-27 20:22:29 | S | 16 37 48.77 | -04 40 36.4 | – | L | C51 |
| 2017-02-27 21:56:44 | S | 16 38 00.403 | -04 40 24.42 | – | L | C51 |
| 2017-02-27 23:30:59 | S | 16 38 12.01 | -04 40 13.7 | – | L | C51 |
| 2017-02-28 01:05:26 | S | 16 38 23.66 | -04 40 02.3 | – | L | C51 |
| 2017-02-28 02:39:40 | S | 16 38 35.28 | -04 39 50.6 | – | 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 |