| Primary satellite | Secondary satellite |
| Name | COSMOS 2251 DEB | Envisat |
| Spacetrack catalog number | 39586 | 27386 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 21 02:55 | 2024 Dec 22 22:03 |
| Time of closest approach (UTC) | 2024 Dec 24 23:09:04.369 |
| Minimum distance | 4.463 km |
| Height difference | -2.048 km |
| Relative speed | 14.902 km/s |
| Angle between velocity vectors | 170° |
| Geographic position | 38.3°S, 46.8°E |
| Height | 780 km |
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