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 |
| 2026 Mar 14 18:56 | 2026 Mar 14 14:50:55 | 85.0075 | 0.00023 | 8.5732 | 73.1038 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 13 18:57 | 2026 Mar 12 15:54:16 | 85.0079 | 0.00024 | 8.6484 | 74.9437 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 12 18:57 | 2026 Mar 12 14:13:40 | 85.0079 | 0.00024 | 8.6511 | 75.1126 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 11 18:56 | 2026 Mar 11 06:22:22 | 85.0082 | 0.00024 | 8.7021 | 76.6973 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 10 18:56 | 2026 Mar 10 03:32:50 | 85.0084 | 0.00024 | 8.7451 | 77.2317 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 09 18:56 | 2026 Mar 09 12:27:29 | 85.0085 | 0.00025 | 8.7693 | 77.8618 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 08 18:57 | 2026 Mar 08 12:59:09 | 85.0087 | 0.00025 | 8.8069 | 78.9884 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 07 18:57 | 2026 Mar 07 15:11:25 | 85.0088 | 0.00025 | 8.8418 | 79.2218 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 06 18:56 | 2026 Mar 06 05:39:31 | 85.0091 | 0.00026 | 8.8956 | 80.2167 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 05 18:56 | 2026 Mar 05 14:34:09 | 85.0092 | 0.00026 | 8.9198 | 80.7557 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 04 18:57 | 2026 Mar 04 06:42:51 | 85.0095 | 0.00026 | 8.9708 | 81.8580 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 03 18:56 | 2026 Mar 03 07:14:31 | 85.0098 | 0.00026 | 9.0084 | 82.4759 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 02 18:57 | 2026 Mar 02 14:28:33 | 85.0099 | 0.00026 | 9.0353 | 83.3974 | 287.0410 | 14.32370 | 5.243 |
| 2026 Mar 01 18:57 | 2026 Mar 01 06:37:15 | 85.0101 | 0.00027 | 9.0863 | 84.6374 | 287.0410 | 14.32370 | 5.243 |
| 2026 Feb 28 18:56 | 2026 Feb 28 12:10:42 | 85.0102 | 0.00027 | 9.1158 | 85.3581 | 287.0410 | 14.32370 | 5.243 |
| 2026 Feb 27 19:05 | 2026 Feb 27 05:59:59 | 85.0105 | 0.00027 | 9.1642 | 86.4891 | 287.0410 | 14.32370 | 5.243 |
| 2026 Feb 26 20:45 | 2026 Feb 26 11:33:26 | 85.0106 | 0.00027 | 9.1937 | 87.1797 | 287.0410 | 14.32370 | 5.243 |