| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 31297 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 20 12:05 | 2021 Jan 19 22:52 |
| Time of closest approach (UTC) | 2020 Dec 05 11:48:08.262 |
| Minimum distance | 9.869 km |
| Height difference | 4.013 km |
| Relative speed | 14.888 km/s |
| Angle between velocity vectors | 171° |
| Geographic position | 38.6°N, 92.9°W |
| Height | 764 km |
|