| Primary satellite | Secondary satellite |
| Name | FW4S | COSMOS 2251 DEB |
| Spacetrack catalog number | 6180 | 34911 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2025 Nov 13 05:30 | 2025 Nov 12 09:50 |
| Time of closest approach (UTC) | 2025 Oct 13 13:44:02.248 |
| Minimum distance | 373.859 km |
| Height difference | 4.966 km |
| Relative speed | 14.051 km/s |
| Angle between velocity vectors | 138° |
| Geographic position | 61.6°N, 170.3°E |
| Height | 684 km |
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