| 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 18:12:56.797 |
| Minimum distance | 3.897 km |
| Height difference | 0.398 km |
| Relative speed | 15.171 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 82.6°S, 75.7°E |
| Height | 548 km |
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