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 |
|---|---|---|---|---|---|---|
| 2017-02-28 04:13:55 | S | 16 38 46.93 | -04 39 39.3 | – | L | C51 |
| 2017-02-28 07:22:36 | S | 16 39 10.26 | -04 39 15.7 | – | L | C51 |
| 2017-02-28 10:31:07 | S | 16 39 33.60 | -04 38 52.4 | – | L | C51 |
| 2017-02-28 13:39:48 | S | 16 39 56.99 | -04 38 28.5 | – | L | C51 |
| 2017-02-28 16:48:18 | S | 16 40 20.40 | -04 38 04.6 | – | L | C51 |
| 2017-02-28 19:56:59 | S | 16 40 43.85 | -04 37 40.2 | – | L | C51 |
| 2017-02-28 23:05:29 | S | 16 41 07.31 | -04 37 16.1 | – | L | C51 |
| 2017-02-28 23:05:40 | S | 16 41 07.33 | -04 37 15.7 | – | L | C51 |
| 2017-03-01 02:14:10 | S | 16 41 30.82 | -04 36 51.5 | – | L | C51 |
| 2017-03-01 05:22:40 | S | 16 41 54.35 | -04 36 26.7 | – | L | C51 |
| 2017-03-01 05:22:51 | S | 16 41 54.37 | -04 36 26.7 | – | L | C51 |
| 2017-03-01 08:31:21 | S | 16 42 17.93 | -04 36 01.5 | – | L | C51 |
| 2017-03-02 12:17:23 | C | 16 45 47.72 | -04 32 15.4 | – | q | 703 |
| 2017-03-02 12:24:42 | C | 16 45 48.57 | -04 32 13.6 | – | q | 703 |
| 2017-03-02 12:32:01 | C | 16 45 49.52 | -04 32 13.4 | – | q | 703 |
| 2017-03-02 12:39:19 | C | 16 45 50.48 | -04 32 11.2 | – | q | 703 |
| 2017-03-03 10:56:40 | C | 16 48 40.56 | -04 28 55.0 | – | R | G45 |
| 2017-03-03 11:10:08 | C | 16 48 42.27 | -04 28 52.7 | – | R | G45 |
| 2017-03-03 11:10:46 | C | 16 48 42.34 | -04 28 53.0 | – | R | G45 |
| 2017-03-03 11:17:14 | C | 16 48 43.15 | -04 28 51.8 | – | R | G45 |
| 2017-03-03 11:25:03 | C | 16 48 44.14 | -04 28 50.6 | – | R | G45 |
| 2017-03-09 02:02:45 | C | 17 06 27.22 | -04 04 58.9 | – | q | 160 |
| 2017-03-09 02:05:35 | C | 17 06 27.62 | -04 04 58.2 | – | q | 160 |
| 2017-03-09 02:08:25 | C | 17 06 27.97 | -04 04 57.4 | – | q | 160 |
| 2017-03-11 02:23:00 | C | 17 13 05.00 | -03 54 42.4 | – | q | 160 |
| 2017-03-11 02:26:00 | C | 17 13 05.38 | -03 54 42.4 | – | q | 160 |
| 2017-03-11 02:29:01 | C | 17 13 05.78 | -03 54 41.1 | – | q | 160 |
| 2017-03-15 09:28:43 | C | 17 27 44.46 | -03 29 41.3 | – | u | H21 |
| 2017-03-15 09:32:37 | C | 17 27 45.01 | -03 29 40.2 | – | u | H21 |
| 2017-03-15 09:36:32 | C | 17 27 45.58 | -03 29 39.0 | – | u | H21 |
| 2017-03-15 09:40:33 | C | 17 27 46.15 | -03 29 37.9 | – | u | H21 |
| 2017-03-15 09:44:27 | C | 17 27 46.72 | -03 29 36.9 | – | u | H21 |
| 2017-03-15 09:48:14 | C | 17 27 47.26 | -03 29 36.0 | – | u | H21 |
| 2017-03-15 09:52:01 | C | 17 27 47.82 | -03 29 35.0 | – | u | H21 |
| 2017-03-15 09:55:47 | C | 17 27 48.37 | -03 29 34.2 | – | u | H21 |
| 2017-03-15 09:59:34 | C | 17 27 48.90 | -03 29 33.1 | – | u | H21 |
| 2017-03-20 19:17:25 | S | 17 47 16.560 | -02 51 56.09 | – | L | C51 |
| 2017-03-28 02:06:35 | C | 18 15 43.27 | -01 50 25.1 | – | q | 160 |
| 2017-03-28 02:08:33 | C | 18 15 43.57 | -01 50 24.8 | – | q | 160 |
| 2017-03-28 02:10:32 | C | 18 15 43.90 | -01 50 24.5 | – | q | 160 |
| 2017-04-04 02:00:32 | C | 18 45 33.23 | -00 40 06.4 | – | q | 160 |
| 2017-04-04 02:02:32 | C | 18 45 33.54 | -00 40 05.3 | – | q | 160 |
| 2017-04-04 02:04:32 | C | 18 45 33.83 | -00 40 04.1 | – | q | 160 |
| 2017-04-07 01:08:38 | C | 18 58 59.44 | -00 07 24.2 | – | q | 160 |
| 2017-04-07 01:10:37 | C | 18 58 59.70 | -00 07 24.5 | – | q | 160 |
| 2017-04-08 00:58:09 | C | 19 03 35.92 | +00 03 53.8 | – | q | 160 |
| 2017-04-08 01:00:06 | C | 19 03 36.31 | +00 03 53.8 | – | q | 160 |
| 2017-04-08 01:02:00 | C | 19 03 36.70 | +00 03 55.5 | – | q | 160 |
| 2017-04-09 01:57:44 | C | 19 08 29.47 | +00 15 54.0 | – | q | 160 |
| 2017-04-09 01:59:40 | C | 19 08 29.86 | +00 15 55.7 | – | q | 160 |
| 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 |