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 |
|---|---|---|---|---|---|---|
| 1999-09-03 11:18:44 | C | 03 21 38.046 | -22 54 07.21 | – | l | 673 |
| 1999-09-11 10:02:50 | C | 03 10 09.69 | -25 14 53.2 | 14.8 | a | 704 |
| 1999-09-11 10:25:33 | C | 03 10 08.05 | -25 15 06.2 | 15.1 | a | 704 |
| 1999-09-11 10:47:00 | C | 03 10 06.53 | -25 15 19.0 | 15.2 | a | 704 |
| 1999-09-11 11:08:12 | C | 03 10 04.97 | -25 15 31.3 | – | a | 704 |
| 1999-09-11 11:29:23 | C | 03 10 03.45 | -25 15 43.0 | 15.2 | a | 704 |
| 1999-09-13 08:05:58 | C | 03 07 10.75 | -25 40 15.6 | 15.4 | a | 704 |
| 1999-09-13 08:21:40 | C | 03 07 09.63 | -25 40 24.1 | 15.0 | a | 704 |
| 1999-09-13 08:37:55 | C | 03 07 08.46 | -25 40 33.2 | 15.0 | a | 704 |
| 1999-09-13 08:53:45 | C | 03 07 07.32 | -25 40 41.4 | 14.8 | a | 704 |
| 1999-09-13 09:09:42 | C | 03 07 06.15 | -25 40 50.3 | 14.6 | a | 704 |
| 1999-09-30 07:36:50 | C | 02 37 58.38 | -27 21 19.9 | 14.9 | a | 704 |
| 1999-09-30 07:55:41 | C | 02 37 56.87 | -27 21 19.6 | 15.1 | a | 704 |
| 1999-09-30 08:14:28 | C | 02 37 55.38 | -27 21 19.6 | 14.9 | a | 704 |
| 1999-09-30 08:33:10 | C | 02 37 53.89 | -27 21 19.4 | 15.0 | a | 704 |
| 1999-09-30 08:52:00 | C | 02 37 52.35 | -27 21 19.1 | 15.4 | a | 704 |
| 1999-10-04 16:51:44 | C | 02 30 12.61 | -27 14 13.6 | – | z | 428 |
| 1999-10-04 16:59:19 | C | 02 30 12.01 | -27 14 12.8 | – | z | 428 |
| 1999-10-06 08:52:29 | C | 02 27 19.38 | -27 08 40.7 | 15.1 | a | 704 |
| 1999-10-06 09:11:32 | C | 02 27 17.92 | -27 08 37.7 | 15.3 | a | 704 |
| 1999-10-06 09:30:50 | C | 02 27 16.44 | -27 08 34.3 | 15.2 | a | 704 |
| 1999-10-06 09:48:36 | C | 02 27 15.04 | -27 08 28.2 | 16.9 | a | 704 |
| 1999-10-18 07:45:40 | C | 02 08 24.77 | -25 40 11.1 | – | i | 670 |
| 1999-10-18 08:10:46 | C | 02 08 23.17 | -25 40 00.0 | – | i | 670 |
| 1999-10-25 13:56:38 | C | 01 59 14.39 | -24 14 12.9 | – | z | 900 |
| 1999-10-25 14:15:15 | C | 01 59 13.48 | -24 14 03.8 | – | z | 900 |
| 1999-10-28 13:56:07 | C | 01 56 03.04 | -23 33 20.9 | – | z | 428 |
| 1999-10-28 14:06:42 | C | 01 56 02.57 | -23 33 14.6 | – | z | 428 |
| 1999-11-03 04:56:21 | C | 01 51 03.20 | -22 11 04.7 | – | z | 860 |
| 1999-11-03 05:13:32 | C | 01 51 02.51 | -22 10 54.9 | – | z | 860 |
| 1999-11-04 13:59:29 | C | 01 50 02.14 | -21 50 09.1 | – | z | 900 |
| 1999-11-04 14:12:41 | C | 01 50 01.68 | -21 50 00.7 | – | z | 900 |
| 1999-11-05 21:31:01 | C | 01 49 07.78 | -21 29 41.8 | – | – | 610 |
| 1999-11-05 21:36:00 | C | 01 49 07.62 | -21 29 38.6 | – | – | 610 |
| 1999-11-05 21:41:00 | C | 01 49 07.47 | -21 29 35.4 | – | – | 610 |
| 1999-11-05 21:46:01 | C | 01 49 07.31 | -21 29 32.2 | – | – | 610 |
| 1999-11-05 21:51:01 | C | 01 49 07.16 | -21 29 29.0 | – | – | 610 |
| 1999-11-10 05:22:59 | C | 01 46 37.90 | -20 20 35.6 | 16.9 | a | 704 |
| 1999-11-10 05:46:32 | C | 01 46 37.37 | -20 20 19.7 | 17.2 | a | 704 |
| 1999-11-10 06:09:58 | C | 01 46 36.83 | -20 20 04.1 | 16.5 | a | 704 |
| 1999-11-10 06:33:27 | C | 01 46 36.26 | -20 19 48.3 | 16.7 | a | 704 |
| 1999-11-10 06:56:51 | C | 01 46 35.73 | -20 19 32.4 | 16.8 | a | 704 |
| 1999-11-13 04:54:28 | C | 01 45 20.40 | -19 31 50.1 | 17.0 | a | 704 |
| 1999-11-13 05:14:31 | C | 01 45 20.04 | -19 31 36.2 | 17.7 | a | 704 |
| 1999-11-13 05:34:28 | C | 01 45 19.65 | -19 31 22.7 | 17.9 | a | 704 |
| 1999-11-13 05:54:29 | C | 01 45 19.29 | -19 31 08.6 | 18.1 | a | 704 |
| 1999-11-13 06:14:37 | C | 01 45 18.93 | -19 30 55.1 | 17.8 | a | 704 |
| 1999-11-13 14:25:02 | C | 01 45 11.15 | -19 25 04.1 | – | c | 474 |
| 1999-11-13 14:30:04 | C | 01 45 11.07 | -19 25 00.5 | – | c | 474 |
| 1999-11-13 14:34:05 | C | 01 45 11.00 | -19 24 57.7 | – | c | 474 |
| 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 |