| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 18403 | 30543 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 23 02:58 | 2024 Dec 22 13:22 |
| Time of closest approach (UTC) | 2024 Dec 29 21:27:11.053 |
| Minimum distance | 3.023 km |
| Height difference | -1.474 km |
| Relative speed | 14.763 km/s |
| Angle between velocity vectors | 177° |
| Geographic position | 55.8°N, 150.6°E |
| Height | 942 km |
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