| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | deb Kosmos-397 |
| Spacetrack catalog number | 34588 | 5529 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 00:00 | 2024 Dec 22 08:56 |
| Time of closest approach (UTC) | 2024 Dec 23 10:58:05.132 |
| Minimum distance | 1.895 km |
| Height difference | 1.253 km |
| Relative speed | 13.655 km/s |
| Angle between velocity vectors | 132° |
| Geographic position | 35.1°S, 64.5°W |
| Height | 758 km |
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