| Primary satellite | Secondary satellite |
| Name | Cosmos 2173 Rocket | Kosmos-883 |
| Spacetrack catalog number | 21797 | 9610 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2025 Nov 16 17:29 | 2025 Nov 16 14:08 |
| Time of closest approach (UTC) | 2025 Oct 15 06:58:12.309 |
| Minimum distance | 4.271 km |
| Height difference | 4.236 km |
| Relative speed | 12.885 km/s |
| Angle between velocity vectors | 122° |
| Geographic position | 75.3°S, 165.7°E |
| Height | 994 km |
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