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 Dec 15 18:58 | 2025 Dec 14 22:05:09 | 85.0080 | 0.00013 | 12.0212 | 67.0695 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 14 18:56 | 2025 Dec 13 22:36:46 | 85.0080 | 0.00014 | 12.0588 | 66.2554 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 13 18:56 | 2025 Dec 13 05:50:48 | 85.0081 | 0.00014 | 12.0857 | 65.8250 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 12 18:57 | 2025 Dec 12 06:22:25 | 85.0081 | 0.00014 | 12.1233 | 64.9465 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 11 18:56 | 2025 Dec 11 06:54:03 | 85.0082 | 0.00015 | 12.1609 | 64.2085 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 10 18:56 | 2025 Dec 10 12:27:28 | 85.0082 | 0.00015 | 12.1905 | 63.5925 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 09 18:56 | 2025 Dec 09 11:18:30 | 85.0083 | 0.00015 | 12.2308 | 63.2380 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 08 18:56 | 2025 Dec 08 06:48:20 | 85.0085 | 0.00016 | 12.2764 | 63.0320 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 07 18:56 | 2025 Dec 07 07:19:57 | 85.0086 | 0.00016 | 12.3140 | 62.5946 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 06 18:56 | 2025 Dec 06 04:30:23 | 85.0087 | 0.00017 | 12.3570 | 62.3275 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 05 18:57 | 2025 Dec 05 06:42:36 | 85.0087 | 0.00017 | 12.3919 | 62.4611 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 04 18:57 | 2025 Dec 04 02:12:26 | 85.0087 | 0.00018 | 12.4376 | 62.5248 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 03 18:56 | 2025 Dec 03 07:45:51 | 85.0088 | 0.00018 | 12.4671 | 62.6870 | 293.0636 | 14.32328 | 5.243 |
| 2025 Dec 02 18:56 | 2025 Dec 02 08:17:29 | 85.0088 | 0.00019 | 12.5047 | 63.0258 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 30 18:57 | 2025 Nov 30 14:22:31 | 85.0089 | 0.00020 | 12.5718 | 63.7579 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 29 18:56 | 2025 Nov 29 03:09:57 | 85.0091 | 0.00020 | 12.6282 | 64.2447 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 28 18:57 | 2025 Nov 28 02:00:58 | 85.0092 | 0.00021 | 12.6685 | 64.9454 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 27 18:57 | 2025 Nov 27 00:51:59 | 85.0094 | 0.00021 | 12.7088 | 65.6436 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 26 18:57 | 2025 Nov 26 03:04:12 | 85.0095 | 0.00022 | 12.7437 | 65.9660 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 25 18:57 | 2025 Nov 25 03:35:50 | 85.0096 | 0.00022 | 12.7813 | 66.6196 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 24 18:56 | 2025 Nov 24 09:09:15 | 85.0097 | 0.00023 | 12.8108 | 67.0731 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 23 18:57 | 2025 Nov 23 02:58:28 | 85.0098 | 0.00023 | 12.8592 | 67.9913 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 21 18:57 | 2025 Nov 21 02:21:06 | 85.0101 | 0.00024 | 12.9370 | 69.3679 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 20 18:56 | 2025 Nov 20 04:33:19 | 85.0102 | 0.00024 | 12.9719 | 70.0221 | 293.0636 | 14.32328 | 5.243 |
| 2025 Nov 18 18:57 | 2025 Nov 18 03:55:57 | 85.0104 | 0.00025 | 13.0498 | 71.6432 | 293.0636 | 14.32328 | 5.243 |