| Primary satellite | Secondary satellite |
| Name | Envisat | Cosmos 858 |
| Spacetrack catalog number | 27386 | 9443 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2023 Mar 24 15:01 | 2023 Mar 24 15:47 |
| Time of closest approach (UTC) | 2023 Feb 05 15:10:07.668 |
| Minimum distance | 27.127 km |
| Height difference | 5.614 km |
| Relative speed | 13.388 km/s |
| Angle between velocity vectors | 128° |
| Geographic position | 74.2°S, 158.5°E |
| Height | 790 km |
|