Orbital elements of USA 18
| Launched | 8 February 1986 |
| Flight ended | – |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 16631 |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| Date fetched |
Epoch osculation |
Inc. [°] |
Ecc. | RA asc node [hr] |
Arg Peri. [°] |
Mean anom [°] |
Mean motion [rev/day] |
Abs. mag |
| 2025 Sep 15 17:56 | 2025 Sep 14 20:01:43 | 63.2920 | 0.07897 | 5.5547 | 107.1514 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 12 17:57 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 11 17:57 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 10 17:56 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 08 17:57 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 07 17:56 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 06 20:41 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 03 17:57 | 2025 Sep 03 01:47:55 | 63.2924 | 0.07914 | 7.7488 | 106.9165 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 02 17:56 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Sep 01 17:56 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 31 17:56 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 30 17:56 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 29 17:56 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 28 17:57 | 2025 Aug 27 20:51:35 | 63.2921 | 0.07924 | 8.9060 | 106.7965 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 27 17:56 | 2025 Aug 23 04:16:37 | 63.2932 | 0.07929 | 9.7806 | 106.7061 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 26 17:56 | 2025 Aug 23 04:16:37 | 63.2932 | 0.07929 | 9.7806 | 106.7061 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 25 17:56 | 2025 Aug 23 04:16:37 | 63.2932 | 0.07929 | 9.7806 | 106.7061 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 24 17:56 | 2025 Aug 23 04:16:37 | 63.2932 | 0.07929 | 9.7806 | 106.7061 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 23 17:56 | 2025 Aug 23 04:16:37 | 63.2932 | 0.07929 | 9.7806 | 106.7061 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 22 17:56 | 2025 Aug 17 21:49:44 | 63.2917 | 0.07935 | 10.7626 | 106.6058 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 20 17:56 | 2025 Aug 17 21:49:44 | 63.2917 | 0.07935 | 10.7626 | 106.6058 | 261.7500 | 13.86251 | 6.743 |
| 2025 Aug 19 17:56 | 2025 Aug 17 21:49:44 | 63.2917 | 0.07935 | 10.7626 | 106.6058 | 261.7500 | 13.86251 | 6.743 |