Orbital elements of USA 21
| Launched | 11 February 1987 |
| Flight ended | – |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 17506 |
| 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 |
| 2024 Jul 25 17:54 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 24 17:53 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 23 17:52 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 22 17:52 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 21 17:52 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 20 17:53 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |
| 2024 Jul 19 17:53 | 2024 Jul 12 14:08:32 | 62.9380 | 0.74507 | 0.3364 | 272.9281 | 12.5566 | 2.01203 | – |