| Primary satellite | Secondary satellite |
| Name | Envisat | COSMOS 1818 DEB |
| Spacetrack catalog number | 27386 | 36947 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 24 11:52 | 2021 Jan 05 07:02 |
| Time of closest approach (UTC) | 2020 Nov 27 03:44:09.484 |
| Minimum distance | 11.856 km |
| Height difference | 6.478 km |
| Relative speed | 14.588 km/s |
| Angle between velocity vectors | 156° |
| Geographic position | 43.5°S, 144.1°W |
| Height | 781 km |
|