| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 10096 | 29872 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:26 | 2025 Nov 17 12:03 |
| Time of closest approach (UTC) | 2025 Oct 15 01:42:08.738 |
| Minimum distance | 80.193 km |
| Height difference | -2.081 km |
| Relative speed | 6.404 km/s |
| Angle between velocity vectors | 50° |
| Geographic position | 62.0°N, 92.8°E |
| Height | 610 km |
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