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 |
|---|---|---|---|---|---|---|
| 2008-10-26 10:16:08 | C | 03 44 06.97 | -10 27 35.7 | – | r | 703 |
| 2008-10-28 05:06:59 | C | 03 41 09.77 | -10 32 49.9 | – | c | 808 |
| 2008-10-28 05:16:29 | C | 03 41 09.01 | -10 32 50.7 | – | c | 808 |
| 2008-10-28 05:26:30 | C | 03 41 08.63 | -10 32 52.5 | – | c | 808 |
| 2008-10-28 05:36:29 | C | 03 41 07.68 | -10 32 54.1 | – | c | 808 |
| 2008-10-28 05:46:00 | C | 03 41 07.11 | -10 32 56.5 | – | c | 808 |
| 2008-10-29 06:07:50 | C | 03 39 26.06 | -10 35 30.3 | – | r | H53 |
| 2008-10-29 06:21:29 | C | 03 39 25.09 | -10 35 32.0 | – | r | H53 |
| 2008-10-29 06:24:14 | C | 03 39 24.94 | -10 35 32.5 | – | r | H53 |
| 2008-10-29 06:30:18 | C | 03 39 24.45 | -10 35 33.4 | – | r | H53 |
| 2008-10-29 06:38:30 | C | 03 39 23.92 | -10 35 34.0 | – | r | H53 |
| 2008-10-29 06:40:02 | C | 03 39 23.78 | -10 35 34.1 | – | r | H53 |
| 2008-11-02 07:52:09 | C | 03 32 42.32 | -10 40 32.4 | – | r | 703 |
| 2008-11-02 08:02:28 | C | 03 32 41.60 | -10 40 31.2 | – | r | 703 |
| 2008-11-02 08:12:56 | C | 03 32 40.84 | -10 40 32.4 | – | r | 703 |
| 2008-11-02 08:23:21 | C | 03 32 40.09 | -10 40 32.7 | – | r | 703 |
| 2008-11-04 00:14:57 | C | 03 29 57.63 | -10 40 27.5 | 16.9 | i | 071 |
| 2008-11-04 00:17:32 | C | 03 29 57.40 | -10 40 27.4 | 17.6 | i | 071 |
| 2008-11-04 00:20:06 | C | 03 29 57.24 | -10 40 27.3 | 17.4 | i | 071 |
| 2008-11-04 00:22:39 | C | 03 29 57.07 | -10 40 27.2 | 17.5 | i | 071 |
| 2008-11-04 00:25:13 | C | 03 29 56.87 | -10 40 27.2 | 16.9 | i | 071 |
| 2008-11-04 00:27:55 | C | 03 29 56.70 | -10 40 27.2 | 17.1 | i | 071 |
| 2008-11-04 00:30:29 | C | 03 29 56.49 | -10 40 27.1 | 16.5 | i | 071 |
| 2008-11-04 00:33:02 | C | 03 29 56.34 | -10 40 27.0 | 17.3 | i | 071 |
| 2008-11-04 00:35:36 | C | 03 29 56.15 | -10 40 26.9 | 17.5 | i | 071 |
| 2008-11-04 00:38:11 | C | 03 29 55.97 | -10 40 26.9 | 17.5 | i | 071 |
| 2008-11-06 23:27:20 | C | 03 25 13.69 | -10 37 19.3 | 17.7 | r | 084 |
| 2008-11-07 21:33:49 | C | 03 23 47.60 | -10 35 34.2 | 17.5 | r | 084 |
| 2008-11-07 21:36:01 | C | 03 23 47.42 | -10 35 33.3 | 17.8 | r | 084 |
| 2008-11-20 06:48:09 | C | 03 06 35.24 | -09 40 58.2 | – | r | 703 |
| 2008-11-20 06:58:37 | C | 03 06 34.74 | -09 40 55.0 | – | r | 703 |
| 2008-11-20 07:09:01 | C | 03 06 34.16 | -09 40 52.5 | – | r | 703 |
| 2008-11-20 07:19:25 | C | 03 06 33.62 | -09 40 49.5 | – | r | 703 |
| 2008-11-21 20:49:54 | C | 03 04 43.99 | -09 30 22.6 | 17.3 | r | 084 |
| 2008-12-02 02:59:36 | C | 02 54 57.35 | -08 06 35.5 | 18.2 | c | 704 |
| 2008-12-02 03:16:34 | C | 02 54 56.78 | -08 06 29.6 | 18.2 | c | 704 |
| 2008-12-02 03:33:29 | C | 02 54 56.21 | -08 06 22.4 | 18.0 | c | 704 |
| 2008-12-02 03:50:24 | C | 02 54 55.66 | -08 06 16.9 | 18.1 | c | 704 |
| 2008-12-02 04:07:21 | C | 02 54 55.09 | -08 06 10.2 | 18.0 | c | 704 |
| 2008-12-13 19:35:09 | C | 02 48 35.91 | -06 09 31.9 | 18.5 | r | C20 |
| 2008-12-13 19:37:16 | C | 02 48 35.92 | -06 09 31.5 | 19.0 | r | C20 |
| 2008-12-14 19:29:07 | C | 02 48 16.98 | -05 58 55.5 | 18.5 | o | C20 |
| 2008-12-14 19:31:14 | C | 02 48 16.98 | -05 58 54.9 | 18.8 | o | C20 |
| 2008-12-17 19:28:00 | C | 02 47 31.81 | -05 26 34.5 | 18.7 | r | C20 |
| 2008-12-17 19:30:06 | C | 02 47 31.79 | -05 26 33.6 | 18.8 | r | C20 |
| 2008-12-18 19:27:49 | C | 02 47 20.62 | -05 15 40.7 | 18.6 | r | C20 |
| 2008-12-18 19:29:56 | C | 02 47 20.62 | -05 15 39.7 | 18.7 | r | C20 |
| 2008-12-19 19:28:52 | C | 02 47 11.40 | -05 04 43.4 | 18.5 | r | C20 |
| 2008-12-19 19:30:59 | C | 02 47 11.37 | -05 04 42.6 | 18.6 | r | C20 |
| 2008-12-22 05:52:59 | C | 02 46 56.633 | -04 37 53.84 | – | – | 645 |
| 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 |