| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 34845 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2023 Dec 06 20:39 | 2023 Dec 03 07:10 |
| Time of closest approach (UTC) | 2023 Sep 29 23:21:55.861 |
| Minimum distance | 1101.553 km |
| Height difference | -3.528 km |
| Relative speed | 5.202 km/s |
| Angle between velocity vectors | 41° |
| Geographic position | 47.2°N, 129.2°W |
| Height | 772 km |
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