| Primary satellite | Secondary satellite |
| Name | USA 81 | Cosmos 1048 |
| Spacetrack catalog number | 21949 | 11111 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 15:14 | 2024 Dec 22 20:15 |
| Time of closest approach (UTC) | 2024 Dec 27 23:47:32.567 |
| Minimum distance | 4.593 km |
| Height difference | -0.397 km |
| Relative speed | 13.962 km/s |
| Angle between velocity vectors | 139° |
| Geographic position | 58.1°S, 117.6°E |
| Height | 809 km |
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