| Primary satellite | Secondary satellite |
| Name | FENGYUN 1C DEB | Cosmos 1125 |
| Spacetrack catalog number | 31217 | 11510 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 21 19:55 | 2024 Dec 22 16:20 |
| Time of closest approach (UTC) | 2024 Dec 28 10:08:38.912 |
| Minimum distance | 3.468 km |
| Height difference | -1.444 km |
| Relative speed | 8.046 km/s |
| Angle between velocity vectors | 65° |
| Geographic position | 66.4°N, 34.3°W |
| Height | 785 km |
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