| Primary satellite | Secondary satellite |
| Name | Cosmos 2173 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 21797 | 29977 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 16 17:29 | 2025 Nov 16 13:50 |
| Time of closest approach (UTC) | 2025 Oct 15 05:12:02.797 |
| Minimum distance | 8.942 km |
| Height difference | 1.730 km |
| Relative speed | 14.586 km/s |
| Angle between velocity vectors | 168° |
| Geographic position | 79.8°S, 177.4°E |
| Height | 992 km |
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