| Primary satellite | Secondary satellite |
| Name | Cosmos 1125 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 11511 | 30744 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 14 11:13 | 2021 Apr 14 04:33 |
| Time of closest approach (UTC) | 2021 Mar 07 08:03:39.940 |
| Minimum distance | 12.351 km |
| Height difference | 1.526 km |
| Relative speed | 14.693 km/s |
| Angle between velocity vectors | 160° |
| Geographic position | 65.8°N, 168.6°W |
| Height | 789 km |
|