| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 31834 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 14 15:39 |
| Time of closest approach (UTC) | 2020 Dec 02 23:09:18.522 |
| Minimum distance | 13.364 km |
| Height difference | 2.043 km |
| Relative speed | 14.791 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 61.2°S, 59.6°E |
| Height | 801 km |
|