| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 29886 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 12:05 | 2021 Jan 19 15:10 |
| Time of closest approach (UTC) | 2020 Dec 06 20:39:20.820 |
| Minimum distance | 68.107 km |
| Height difference | 1.927 km |
| Relative speed | 14.272 km/s |
| Angle between velocity vectors | 147° |
| Geographic position | 72.0°S, 56.3°E |
| Height | 805 km |
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