| Primary satellite | Secondary satellite |
| Name | Cosmos 1812 | LilacSat-2 |
| Spacetrack catalog number | 17295 | 40908 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 15 20:27 | 2021 Apr 15 12:26 |
| Time of closest approach (UTC) | 2021 Mar 07 13:27:37.852 |
| Minimum distance | 5.706 km |
| Height difference | 0.398 km |
| Relative speed | 15.172 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 82.5°S, 142.9°E |
| Height | 548 km |
|