| Primary satellite | Secondary satellite |
| Name | Cosmos 841 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 9023 | 36658 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 22 20:38 | 2020 Dec 24 11:09 |
| Time of closest approach (UTC) | 2020 Dec 01 21:35:40.129 |
| Minimum distance | 38.921 km |
| Height difference | 2.099 km |
| Relative speed | 12.912 km/s |
| Angle between velocity vectors | 119° |
| Geographic position | 74.0°N, 26.8°W |
| Height | 763 km |
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