| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | ERS 2 DEB |
| Spacetrack catalog number | 34885 | 35393 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 20:12 | 2024 Dec 22 21:18 |
| Time of closest approach (UTC) | 2024 Dec 25 21:43:01.456 |
| Minimum distance | 2.223 km |
| Height difference | 2.223 km |
| Relative speed | 14.748 km/s |
| Angle between velocity vectors | 161° |
| Geographic position | 64.3°S, 80.4°W |
| Height | 747 km |
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