| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 33971 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Jul 13 11:52 | 2025 Jul 13 09:59 |
| Time of closest approach (UTC) | 2025 Jun 18 19:23:10.343 |
| Minimum distance | 0.964 km |
| Height difference | -0.718 km |
| Relative speed | 11.221 km/s |
| Angle between velocity vectors | 97° |
| Geographic position | 72.8°N, 135.4°E |
| Height | 774 km |
|