| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 18403 | 30388 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 23 00:15 |
| Time of closest approach (UTC) | 2024 Dec 24 07:05:36.879 |
| Minimum distance | 4.558 km |
| Height difference | 3.337 km |
| Relative speed | 14.732 km/s |
| Angle between velocity vectors | 178° |
| Geographic position | 44.1°N, 12.1°E |
| Height | 941 km |
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