| 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 07 04:10:36.118 |
| Minimum distance | 76.073 km |
| Height difference | -4.049 km |
| Relative speed | 14.380 km/s |
| Angle between velocity vectors | 148° |
| Geographic position | 71.7°N, 124.2°E |
| Height | 771 km |
|