Orbital elements of USA 55
| Launched | 4 April 1990 |
| Flight ended | – |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 20547 |
| 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 |
| 2026 Mar 15 18:56 | 2026 Mar 15 13:23:47 | 94.0880 | 0.00587 | 6.0510 | 132.1709 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 14 18:56 | 2026 Mar 10 11:59:34 | 94.0887 | 0.00580 | 5.8614 | 151.0442 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 13 18:57 | 2026 Mar 10 11:59:34 | 94.0887 | 0.00580 | 5.8614 | 151.0442 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 12 18:57 | 2026 Mar 10 11:59:34 | 94.0887 | 0.00580 | 5.8614 | 151.0442 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 11 18:56 | 2026 Mar 10 11:59:34 | 94.0887 | 0.00580 | 5.8614 | 151.0442 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 10 18:56 | 2026 Mar 10 11:59:34 | 94.0887 | 0.00580 | 5.8614 | 151.0442 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 09 18:56 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 08 18:57 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 07 18:57 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 06 18:56 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 05 18:56 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 04 18:57 | 2026 Mar 04 01:53:45 | 94.0882 | 0.00570 | 5.6207 | 175.3892 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 03 18:56 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 02 18:57 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |
| 2026 Mar 01 18:57 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |
| 2026 Feb 28 18:56 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |
| 2026 Feb 27 19:05 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |
| 2026 Feb 26 20:45 | 2026 Feb 26 12:01:35 | 94.0897 | 0.00560 | 5.4117 | 196.9394 | 228.4552 | 15.43076 | 9.743 |