| Primary satellite | Secondary satellite |
| Name | Cosmos 1812 | TIANHUI 2-01A |
| Spacetrack catalog number | 17295 | 44207 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 15 23:37 | 2021 Apr 15 23:33 |
| Time of closest approach (UTC) | 2021 Mar 03 18:30:27.262 |
| Minimum distance | 2.292 km |
| Height difference | 0.669 km |
| Relative speed | 15.211 km/s |
| Angle between velocity vectors | 180° |
| Geographic position | 58.3°N, 21.7°W |
| Height | 526 km |
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