| Primary satellite | Secondary satellite |
| Name | FENGYUN 1C DEB | deb Kosmos-839 |
| Spacetrack catalog number | 31091 | 21957 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2025 Nov 16 04:29 | 2025 Nov 16 20:37 |
| Time of closest approach (UTC) | 2025 Oct 19 06:28:46.912 |
| Minimum distance | 76.460 km |
| Height difference | -2.633 km |
| Relative speed | 11.993 km/s |
| Angle between velocity vectors | 105° |
| Geographic position | 65.8°N, 126.7°E |
| Height | 900 km |
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