| Primary satellite | Secondary satellite |
| Name | Cosmos 841 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 9023 | 37038 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:52 | 2021 Jan 14 15:06 |
| Time of closest approach (UTC) | 2020 Nov 30 20:15:15.313 |
| Minimum distance | 1.963 km |
| Height difference | 0.492 km |
| Relative speed | 14.930 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 17.6°N, 82.6°W |
| Height | 767 km |
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