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 |
|---|---|---|---|---|---|---|
| 1999-07-06 03:19:50 | C | 13 44 43.68 | +48 29 30.8 | – | i | 726 |
| 1999-07-06 03:24:51 | C | 13 44 43.20 | +48 29 37.1 | – | i | 726 |
| 1999-07-06 03:29:51 | C | 13 44 42.68 | +48 29 44.3 | – | i | 726 |
| 1999-07-06 03:34:50 | C | 13 44 42.18 | +48 29 49.6 | – | i | 726 |
| 1999-07-06 04:50:33 | C | 13 44 34.916 | +48 31 40.56 | – | – | 673 |
| 1999-07-06 04:56:33 | C | 13 44 34.359 | +48 31 47.50 | – | – | 673 |
| 1999-07-06 05:01:36 | C | 13 44 33.813 | +48 31 53.75 | – | – | 673 |
| 1999-07-06 21:57:04 | C | 13 42 55.89 | +48 54 40.6 | – | z | 620 |
| 1999-07-06 22:03:14 | C | 13 42 55.19 | +48 54 48.7 | – | z | 620 |
| 1999-07-06 22:08:49 | C | 13 42 54.57 | +48 54 56.0 | – | z | 620 |
| 1999-07-06 22:11:44 | C | 13 42 54.19 | +48 54 59.6 | – | z | 620 |
| 1999-07-07 03:14:34 | C | 13 42 24.96 | +49 02 05.7 | – | i | 726 |
| 1999-07-07 03:19:34 | C | 13 42 24.40 | +49 02 12.7 | – | i | 726 |
| 1999-07-07 03:24:33 | C | 13 42 23.82 | +49 02 19.0 | – | i | 726 |
| 1999-07-07 03:29:32 | C | 13 42 23.26 | +49 02 26.0 | – | i | 726 |
| 1999-07-07 03:34:32 | C | 13 42 22.67 | +49 02 32.5 | – | i | 726 |
| 1999-07-07 03:39:33 | C | 13 42 22.11 | +49 02 39.3 | – | i | 726 |
| 1999-07-07 20:47:19 | C | 13 40 32.94 | +49 27 25.9 | – | z | 587 |
| 1999-07-07 20:51:19 | C | 13 40 32.45 | +49 27 31.3 | – | z | 587 |
| 1999-07-07 20:54:29 | C | 13 40 32.05 | +49 27 35.8 | – | z | 587 |
| 1999-07-08 04:22:38 | C | 13 39 41.00 | +49 38 41.5 | 14.6 | z | 762 |
| 1999-07-08 04:29:21 | C | 13 39 40.18 | +49 38 51.0 | 14.7 | z | 762 |
| 1999-07-08 04:40:58 | C | 13 39 38.64 | +49 39 06.3 | 14.8 | z | 762 |
| 1999-07-08 11:28:59 | C | 13 38 52.83 | +49 49 56.4 | – | – | 360 |
| 1999-07-08 11:31:14 | C | 13 38 52.52 | +49 49 59.8 | – | – | 360 |
| 1999-07-08 11:33:30 | C | 13 38 52.22 | +49 50 03.1 | – | – | 360 |
| 1999-07-08 19:54:25 | C | 13 37 50.82 | +50 02 46.4 | – | – | 121 |
| 1999-07-08 20:30:25 | C | 13 37 46.12 | +50 03 39.7 | – | – | 121 |
| 1999-07-08 21:15:28 | C | 13 37 40.33 | +50 04 46.6 | – | – | 121 |
| 1999-07-08 21:51:28 | C | 13 37 35.83 | +50 05 39.7 | – | – | 121 |
| 1999-07-08 22:34:56 | C | 13 37 30.45 | +50 06 44.4 | – | – | 121 |
| 1999-07-08 23:18:55 | C | 13 37 25.09 | +50 07 49.0 | – | – | 121 |
| 1999-07-09 11:21:40 | C | 13 35 53.05 | +50 28 17.2 | – | z | 402 |
| 1999-07-09 11:23:28 | C | 13 35 52.76 | +50 28 20.3 | – | z | 402 |
| 1999-07-09 11:25:16 | C | 13 35 52.51 | +50 28 23.0 | – | z | 402 |
| 1999-07-09 21:07:05 | C | 13 34 32.88 | +50 44 39.5 | – | – | 952 |
| 1999-07-09 21:09:17 | C | 13 34 32.49 | +50 44 43.5 | – | – | 952 |
| 1999-07-09 21:14:00 | C | 13 34 31.79 | +50 44 50.9 | – | – | 952 |
| 1999-07-09 21:17:17 | C | 13 34 31.25 | +50 44 56.1 | – | – | 952 |
| 1999-07-09 21:19:46 | C | 13 34 30.86 | +50 44 59.9 | – | – | 952 |
| 1999-07-09 21:21:23 | C | 13 34 30.56 | +50 45 02.7 | – | – | 952 |
| 1999-07-10 23:39:59 | C | 13 30 32.86 | +51 31 36.7 | – | – | 557 |
| 1999-07-10 23:56:26 | C | 13 30 30.27 | +51 32 05.3 | – | – | 557 |
| 1999-07-11 00:05:49 | C | 13 30 28.77 | +51 32 21.5 | – | – | 557 |
| 1999-07-12 21:19:43 | C | 13 22 09.76 | +53 03 41.9 | – | – | 557 |
| 1999-07-12 21:53:59 | C | 13 22 02.32 | +53 04 51.5 | – | – | 557 |
| 1999-07-12 22:16:06 | C | 13 21 57.55 | +53 05 36.2 | – | – | 557 |
| 1999-07-13 20:52:31 | C | 13 16 51.11 | +53 56 44.0 | – | – | 557 |
| 1999-07-13 21:07:58 | C | 13 16 47.19 | +53 57 18.0 | – | – | 557 |
| 1999-07-13 21:23:21 | C | 13 16 43.32 | +53 57 51.8 | – | – | 557 |
| 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 |