| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | Cosmos 858 |
| Spacetrack catalog number | 35433 | 9443 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 18 02:11 | 2024 Dec 23 09:57 |
| Time of closest approach (UTC) | 2024 Dec 25 16:29:07.143 |
| Minimum distance | 3.779 km |
| Height difference | 3.656 km |
| Relative speed | 14.154 km/s |
| Angle between velocity vectors | 143° |
| Geographic position | 29.8°S, 88.2°W |
| Height | 785 km |
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