| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 31179 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 12:51 | 2021 Jan 15 19:54 |
| Time of closest approach (UTC) | 2020 Dec 01 21:57:20.567 |
| Minimum distance | 23.766 km |
| Height difference | -5.481 km |
| Relative speed | 14.091 km/s |
| Angle between velocity vectors | 140° |
| Geographic position | 73.5°S, 5.5°E |
| Height | 807 km |
|