| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 35095 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 10 23:14 |
| Time of closest approach (UTC) | 2020 Dec 04 00:09:23.252 |
| Minimum distance | 30.335 km |
| Height difference | -0.902 km |
| Relative speed | 9.870 km/s |
| Angle between velocity vectors | 83° |
| Geographic position | 70.8°S, 18.1°E |
| Height | 805 km |
|