| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | Kosmos-400 |
| Spacetrack catalog number | 34459 | 5050 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 09:30 | 2024 Dec 22 14:56 |
| Time of closest approach (UTC) | 2024 Dec 26 09:53:07.235 |
| Minimum distance | 3.246 km |
| Height difference | 2.414 km |
| Relative speed | 7.521 km/s |
| Angle between velocity vectors | 62° |
| Geographic position | 65.3°N, 64.6°W |
| Height | 1004 km |
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