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 Jun 03 17:57 | 2025 Jun 03 03:28:15 | 85.0062 | 0.00018 | 19.5121 | 115.5673 | 244.5704 | 14.32241 | 5.243 |
| 2025 Jun 02 17:58 | 2025 Jun 01 21:17:22 | 85.0061 | 0.00017 | 19.5605 | 115.6606 | 244.5704 | 14.32241 | 5.243 |
| 2025 Jun 01 17:56 | 2025 May 31 21:48:55 | 85.0060 | 0.00017 | 19.5982 | 115.5373 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 31 17:56 | 2025 May 31 11:45:17 | 85.0060 | 0.00017 | 19.6143 | 115.2269 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 30 17:56 | 2025 May 30 10:36:14 | 85.0059 | 0.00016 | 19.6546 | 114.9510 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 29 17:56 | 2025 May 29 02:44:45 | 85.0057 | 0.00016 | 19.7057 | 114.4838 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 28 17:56 | 2025 May 27 15:32:04 | 85.0055 | 0.00015 | 19.7622 | 113.5765 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 27 17:57 | 2025 May 25 16:35:08 | 85.0054 | 0.00014 | 19.8375 | 112.1125 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 26 17:56 | 2025 May 25 16:35:08 | 85.0054 | 0.00014 | 19.8375 | 112.1125 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 25 17:56 | 2025 May 24 18:47:17 | 85.0053 | 0.00014 | 19.8724 | 111.4998 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 24 17:57 | 2025 May 23 19:18:49 | 85.0053 | 0.00013 | 19.9101 | 110.1781 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 23 17:56 | 2025 May 23 10:55:48 | 85.0052 | 0.00013 | 19.9235 | 109.5643 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 22 17:56 | 2025 May 22 04:44:55 | 85.0052 | 0.00013 | 19.9719 | 107.3884 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 21 17:56 | 2025 May 20 22:34:03 | 85.0051 | 0.00013 | 20.0203 | 105.3399 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 20 17:56 | 2025 May 19 13:01:57 | 85.0050 | 0.00012 | 20.0741 | 103.2540 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 19 17:56 | 2025 May 19 13:01:57 | 85.0050 | 0.00012 | 20.0741 | 103.2540 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 18 17:57 | 2025 May 18 05:10:28 | 85.0049 | 0.00012 | 20.1252 | 100.8341 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 17 17:57 | 2025 May 17 04:01:24 | 85.0048 | 0.00012 | 20.1656 | 99.2408 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 16 17:56 | 2025 May 15 23:31:08 | 85.0048 | 0.00011 | 20.2113 | 96.1256 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 15 17:57 | 2025 May 14 20:41:27 | 85.0047 | 0.00012 | 20.2543 | 93.1852 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 14 17:56 | 2025 May 13 21:12:59 | 85.0046 | 0.00012 | 20.2919 | 90.9452 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 13 17:56 | 2025 May 13 12:49:58 | 85.0046 | 0.00012 | 20.3054 | 90.5401 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 12 17:56 | 2025 May 12 04:58:29 | 85.0044 | 0.00012 | 20.3565 | 87.2751 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 11 17:56 | 2025 May 10 22:47:36 | 85.0045 | 0.00012 | 20.4049 | 84.3019 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 10 17:56 | 2025 May 09 13:15:30 | 85.0045 | 0.00012 | 20.4587 | 81.3820 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 09 17:57 | 2025 May 09 13:15:30 | 85.0045 | 0.00012 | 20.4587 | 81.3820 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 08 17:56 | 2025 May 08 00:22:12 | 85.0045 | 0.00012 | 20.5179 | 78.3931 | 244.5704 | 14.32241 | 5.243 |
| 2025 May 07 17:56 | 2025 May 06 23:13:08 | 85.0045 | 0.00012 | 20.5582 | 76.5546 | 244.5704 | 14.32241 | 5.243 |