| Primary satellite | Secondary satellite |
| Name | Cosmos 2173 Rocket | FENGYUN 1C DEB |
| Spacetrack catalog number | 21797 | 29793 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Nov 16 17:29 | 2025 Nov 15 11:20 |
| Time of closest approach (UTC) | 2025 Oct 16 07:17:03.916 |
| Minimum distance | 8.134 km |
| Height difference | -1.017 km |
| Relative speed | 14.236 km/s |
| Angle between velocity vectors | 152° |
| Geographic position | 81.6°S, 63.6°E |
| Height | 988 km |
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