| Primary satellite | Secondary satellite |
| Name | Cosmos 841 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 9023 | 31530 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 22 20:38 | 2020 Dec 25 02:10 |
| Time of closest approach (UTC) | 2020 Nov 28 05:15:22.344 |
| Minimum distance | 16.487 km |
| Height difference | 1.551 km |
| Relative speed | 14.474 km/s |
| Angle between velocity vectors | 151° |
| Geographic position | 71.7°N, 94.6°W |
| Height | 763 km |
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