| Primary satellite | Secondary satellite |
| Name | Cosmos 841 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 9023 | 30700 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:52 | 2021 Jan 16 00:58 |
| Time of closest approach (UTC) | 2020 Nov 28 01:49:09.794 |
| Minimum distance | 30.852 km |
| Height difference | 2.265 km |
| Relative speed | 9.579 km/s |
| Angle between velocity vectors | 79° |
| Geographic position | 69.9°N, 112.4°W |
| Height | 766 km |
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