| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | STARS |
| Spacetrack catalog number | 10096 | 33498 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:26 | 2025 Nov 17 13:17 |
| Time of closest approach (UTC) | 2025 Oct 18 16:31:36.930 |
| Minimum distance | 184.500 km |
| Height difference | 0.437 km |
| Relative speed | 13.095 km/s |
| Angle between velocity vectors | 120° |
| Geographic position | 75.6°N, 170.0°E |
| Height | 606 km |
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