| Primary satellite | Secondary satellite |
| Name | Cosmos 1821 Rocket | Tsikada Rocket |
| Spacetrack catalog number | 17526 | 23466 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Apr 12 10:56 | 2021 Apr 12 14:26 |
| Time of closest approach (UTC) | 2021 Mar 01 06:53:49.174 |
| Minimum distance | 16.069 km |
| Height difference | 0.616 km |
| Relative speed | 13.041 km/s |
| Angle between velocity vectors | 125° |
| Geographic position | 74.3°S, 52.5°E |
| Height | 1017 km |
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