Orbital elements of USA 81
| Launched | 24 April 1992 |
| Flight ended | – |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 21949 |
| 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 12 17:57 | 2025 Sep 11 22:58:24 | 85.0050 | 0.00013 | 15.6333 | 103.3883 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 11 17:57 | 2025 Sep 11 04:31:47 | 85.0049 | 0.00013 | 15.6629 | 102.2798 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 10 17:56 | 2025 Sep 10 00:01:33 | 85.0047 | 0.00012 | 15.7086 | 100.4788 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 08 17:57 | 2025 Sep 08 06:06:30 | 85.0045 | 0.00012 | 15.7758 | 96.7665 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 07 17:56 | 2025 Sep 07 04:57:29 | 85.0044 | 0.00012 | 15.8161 | 94.7480 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 06 20:41 | 2025 Sep 06 05:29:03 | 85.0043 | 0.00012 | 15.8537 | 92.5421 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 03 17:57 | 2025 Sep 03 05:23:10 | 85.0039 | 0.00012 | 15.9694 | 87.0826 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 02 17:56 | 2025 Sep 02 05:54:44 | 85.0038 | 0.00012 | 16.0070 | 84.7477 | 256.7455 | 14.32272 | 5.243 |
| 2025 Sep 01 17:56 | 2025 Sep 01 06:26:18 | 85.0037 | 0.00012 | 16.0446 | 83.1525 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 31 17:56 | 2025 Aug 31 01:56:04 | 85.0035 | 0.00012 | 16.0904 | 81.1998 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 30 17:56 | 2025 Aug 30 05:48:50 | 85.0034 | 0.00013 | 16.1226 | 80.3997 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 29 17:56 | 2025 Aug 29 01:18:36 | 85.0033 | 0.00013 | 16.1683 | 78.7933 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 28 17:57 | 2025 Aug 27 17:27:09 | 85.0033 | 0.00013 | 16.2194 | 76.3193 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 27 17:56 | 2025 Aug 26 23:00:32 | 85.0032 | 0.00013 | 16.2490 | 75.2696 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 26 17:56 | 2025 Aug 25 18:30:17 | 85.0033 | 0.00014 | 16.2947 | 73.2360 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 25 17:56 | 2025 Aug 24 22:23:03 | 85.0033 | 0.00014 | 16.3270 | 72.1328 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 24 17:56 | 2025 Aug 23 22:54:37 | 85.0033 | 0.00014 | 16.3646 | 71.2768 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 23 17:56 | 2025 Aug 22 11:41:58 | 85.0034 | 0.00015 | 16.4211 | 69.7226 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 22 17:56 | 2025 Aug 20 17:46:54 | 85.0034 | 0.00016 | 16.4883 | 68.9478 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 20 17:56 | 2025 Aug 20 07:43:18 | 85.0034 | 0.00016 | 16.5045 | 68.6674 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 19 17:56 | 2025 Aug 19 03:13:03 | 85.0033 | 0.00016 | 16.5502 | 68.0534 | 256.7455 | 14.32272 | 5.243 |
| 2025 Aug 18 17:56 | 2025 Aug 17 19:21:36 | 85.0033 | 0.00017 | 16.6013 | 67.6157 | 256.7455 | 14.32272 | 5.243 |