| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 2251 DEB |
| Spacetrack catalog number | 27386 | 34579 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 00:47 | 2021 Jan 20 03:37 |
| Time of closest approach (UTC) | 2020 Nov 30 10:08:04.333 |
| Minimum distance | 11.604 km |
| Height difference | 0.680 km |
| Relative speed | 6.754 km/s |
| Angle between velocity vectors | 54° |
| Geographic position | 62.3°S, 127.7°E |
| Height | 789 km |
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