| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 35825 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Dec 13 14:56 | 2025 Dec 06 17:43 |
| Time of closest approach (UTC) | 2025 Nov 15 08:06:10.850 |
| Minimum distance | 210.451 km |
| Height difference | 4.036 km |
| Relative speed | 10.231 km/s |
| Angle between velocity vectors | 86° |
| Geographic position | 70.4°S, 109.6°W |
| Height | 788 km |
|