| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 34009 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Jul 13 11:52 | 2025 Jul 12 22:07 |
| Time of closest approach (UTC) | 2025 Jun 19 10:33:48.963 |
| Minimum distance | 0.671 km |
| Height difference | 0.321 km |
| Relative speed | 14.901 km/s |
| Angle between velocity vectors | 170° |
| Geographic position | 40.4°N, 113.3°W |
| Height | 767 km |
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