| Primary satellite | Secondary satellite |
| Name | USA 81 | PAYLOAD A |
| Spacetrack catalog number | 21949 | 27430 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 15:14 | 2024 Dec 22 20:18 |
| Time of closest approach (UTC) | 2024 Dec 26 21:59:50.901 |
| Minimum distance | 3.116 km |
| Height difference | 2.252 km |
| Relative speed | 8.959 km/s |
| Angle between velocity vectors | 74° |
| Geographic position | 78.4°N, 113.0°E |
| Height | 797 km |
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