| Primary satellite | Secondary satellite |
| Name | Cosmos 2173 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 21797 | 29920 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 16 17:29 | 2025 Nov 16 07:26 |
| Time of closest approach (UTC) | 2025 Oct 14 10:05:55.032 |
| Minimum distance | 1.337 km |
| Height difference | -0.991 km |
| Relative speed | 14.656 km/s |
| Angle between velocity vectors | 176° |
| Geographic position | 67.3°S, 131.2°E |
| Height | 995 km |
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