| Primary satellite | Secondary satellite |
| Name | Cosmos 1821 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 17526 | 38513 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2022 May 20 11:15 | 2022 May 19 17:34 |
| Time of closest approach (UTC) | 2022 Jan 22 12:30:42.868 |
| Minimum distance | 30.837 km |
| Height difference | -30.345 km |
| Relative speed | 14.702 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 52.8°S, 94.5°W |
| Height | 966 km |
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