| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 33766 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 24 11:52 | 2021 Jan 23 23:11 |
| Time of closest approach (UTC) | 2020 Nov 30 21:38:09.785 |
| Minimum distance | 8.002 km |
| Height difference | 5.396 km |
| Relative speed | 13.214 km/s |
| Angle between velocity vectors | 125° |
| Geographic position | 74.3°S, 89.1°E |
| Height | 791 km |
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