| Primary satellite | Secondary satellite |
| Name | Cosmos 1821 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 17526 | 49389 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2022 May 20 11:15 | 2022 May 19 21:32 |
| Time of closest approach (UTC) | 2022 Jan 20 20:02:23.601 |
| Minimum distance | 4532.135 km |
| Height difference | 29.720 km |
| Relative speed | 7.410 km/s |
| Angle between velocity vectors | 61° |
| Geographic position | 51.6°S, 6.1°W |
| Height | 986 km |
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