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 |
|---|---|---|---|---|---|---|
| 1999-11-16 06:21:02 | C | 01 44 21.61 | -18 41 05.5 | – | i | 670 |
| 1999-11-16 06:41:38 | C | 01 44 21.28 | -18 40 50.2 | – | i | 670 |
| 1999-11-16 07:05:27 | C | 01 44 21.03 | -18 40 34.7 | – | i | 670 |
| 2000-01-09 01:57:29 | C | 02 08 04.58 | -04 33 47.0 | 18.5 | a | 704 |
| 2000-01-09 02:19:07 | C | 02 08 05.40 | -04 33 35.2 | 19.5 | a | 704 |
| 2000-01-09 03:05:30 | C | 02 08 07.13 | -04 33 08.4 | 19.1 | a | 704 |
| 2000-01-09 03:27:44 | C | 02 08 07.95 | -04 32 53.2 | 19.1 | a | 704 |
| 2000-01-10 02:37:39 | C | 02 09 02.02 | -04 19 34.8 | – | z | 711 |
| 2000-01-11 02:10:22 | C | 02 09 57.63 | -04 06 06.4 | 19.7 | a | 704 |
| 2000-01-11 02:29:09 | C | 02 09 58.35 | -04 05 56.9 | – | z | 711 |
| 2000-01-11 02:32:09 | C | 02 09 58.44 | -04 05 54.6 | 19.2 | a | 704 |
| 2000-01-11 02:53:49 | C | 02 09 59.34 | -04 05 42.3 | 19.6 | a | 704 |
| 2000-12-23 06:21:32 | C | 06 54 56.46 | +12 45 44.8 | – | – | 696 |
| 2000-12-23 06:28:21 | C | 06 54 56.17 | +12 45 46.0 | – | – | 696 |
| 2000-12-31 07:24:45 | C | 06 47 31.47 | +13 03 16.7 | – | – | 711 |
| 2000-12-31 08:02:18 | C | 06 47 30.04 | +13 03 20.2 | – | – | 711 |
| 2002-11-06 12:27:54 | C | 10 50 17.83 | +10 22 39.8 | – | d | 291 |
| 2002-11-06 12:33:28 | C | 10 50 18.03 | +10 22 39.0 | – | d | 291 |
| 2002-12-11 10:44:33 | C | 11 11 44.004 | +09 29 08.25 | – | – | 645 |
| 2002-12-11 10:49:20 | C | 11 11 44.085 | +09 29 08.39 | – | – | 645 |
| 2002-12-14 11:10:01 | C | 11 12 54.92 | +09 30 06.0 | – | d | 291 |
| 2002-12-14 11:19:39 | C | 11 12 55.14 | +09 30 07.1 | – | d | 291 |
| 2002-12-14 11:30:04 | C | 11 12 55.20 | +09 30 07.1 | – | d | 291 |
| 2003-02-09 08:46:35 | C | 11 03 40.42 | +13 47 58.1 | – | d | 291 |
| 2003-02-09 08:53:28 | C | 11 03 40.17 | +13 48 00.6 | – | d | 291 |
| 2003-02-09 08:59:26 | C | 11 03 39.97 | +13 48 02.7 | – | d | 291 |
| 2003-02-24 23:03:32 | C | 10 49 53.73 | +16 04 22.1 | – | c | 240 |
| 2003-02-24 23:05:20 | C | 10 49 53.67 | +16 04 22.9 | – | c | 240 |
| 2003-02-24 23:10:46 | C | 10 49 53.42 | +16 04 25.4 | – | c | 240 |
| 2003-02-24 23:21:39 | C | 10 49 52.98 | +16 04 30.4 | – | c | 240 |
| 2003-02-28 07:32:53 | C | 10 46 32.19 | +16 34 01.0 | 19.7 | c | 704 |
| 2003-02-28 07:54:27 | C | 10 46 31.25 | +16 34 09.5 | 20.0 | c | 704 |
| 2003-02-28 08:14:53 | C | 10 46 30.42 | +16 34 17.4 | 19.5 | c | 704 |
| 2003-02-28 08:35:59 | C | 10 46 29.45 | +16 34 24.3 | 19.5 | c | 704 |
| 2003-03-08 07:10:18 | C | 10 38 18.55 | +17 41 58.6 | 19.3 | c | 704 |
| 2003-03-08 07:29:10 | C | 10 38 17.74 | +17 42 04.4 | 19.7 | c | 704 |
| 2003-03-08 07:48:28 | C | 10 38 16.87 | +17 42 10.4 | 19.5 | c | 704 |
| 2003-03-08 08:26:46 | C | 10 38 15.22 | +17 42 24.1 | 19.7 | c | 704 |
| 2007-01-10 10:52:15 | C | 09 57 08.69 | +13 55 27.8 | – | o | 691 |
| 2007-01-27 09:52:38 | C | 09 45 42.93 | +15 23 47.8 | – | o | 691 |
| 2007-01-27 10:18:36 | C | 09 45 42.07 | +15 23 54.4 | – | o | 691 |
| 2007-01-27 10:44:55 | C | 09 45 41.20 | +15 24 00.2 | – | o | 691 |
| 2007-02-08 07:38:30 | C | 09 35 42.10 | +16 33 29.3 | – | r | G96 |
| 2007-02-08 07:48:12 | C | 09 35 41.78 | +16 33 31.7 | – | r | G96 |
| 2007-02-08 07:57:55 | C | 09 35 41.42 | +16 33 34.0 | – | r | G96 |
| 2007-02-08 08:07:33 | C | 09 35 41.06 | +16 33 36.3 | – | r | G96 |
| 2007-02-15 11:24:30 | C | 09 29 20.02 | +17 15 20.9 | – | c | 568 |
| 2007-03-11 06:19:41 | C | 09 09 48.09 | +19 14 51.3 | – | r | G96 |
| 2007-03-11 06:30:15 | C | 09 09 47.84 | +19 14 53.1 | – | r | G96 |
| 2007-03-11 06:40:45 | C | 09 09 47.55 | +19 14 54.9 | – | r | G96 |
| 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 |