| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | Envisat |
| Spacetrack catalog number | 34588 | 27386 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 00:00 | 2024 Dec 22 22:03 |
| Time of closest approach (UTC) | 2024 Dec 26 19:33:21.033 |
| Minimum distance | 1.511 km |
| Height difference | 0.504 km |
| Relative speed | 12.928 km/s |
| Angle between velocity vectors | 120° |
| Geographic position | 74.1°N, 103.4°W |
| Height | 774 km |
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