| Primary satellite | Secondary satellite |
| Name | USA 281 | PORCUPINE 2 |
| Spacetrack catalog number | 43145 | 1577 |
| Radar cross section | | medium |
| Epoch of two-line elements (UTC) | 2024 Dec 18 05:49 | 2024 Dec 22 22:07 |
| Time of closest approach (UTC) | 2024 Dec 24 01:33:34.188 |
| Minimum distance | 4.423 km |
| Height difference | -2.692 km |
| Relative speed | 2.129 km/s |
| Angle between velocity vectors | 17° |
| Geographic position | 16.5°N, 85.3°W |
| Height | 1080 km |
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