| 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 06:55 | 2023 Mar 23 16:21 |
| Time of closest approach (UTC) | 2023 Feb 05 15:09:36.417 |
| Minimum distance | 315.420 km |
| Height difference | 5.828 km |
| Relative speed | 13.392 km/s |
| Angle between velocity vectors | 128° |
| Geographic position | 76.4°S, 152.8°E |
| Height | 791 km |
|