| Primary satellite | Secondary satellite |
| Name | Envisat | Cosmos 858 |
| Spacetrack catalog number | 27386 | 9443 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2022 May 21 09:52 | 2022 May 21 21:37 |
| Time of closest approach (UTC) | 2022 Feb 01 02:36:31.335 |
| Minimum distance | 30.305 km |
| Height difference | 2.031 km |
| Relative speed | 14.904 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 11.3°S, 27.6°E |
| Height | 771 km |
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