| Primary satellite | Secondary satellite |
| Name | Cosmos 921 Rocket | Explorer 25 |
| Spacetrack catalog number | 10096 | 932 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2025 Nov 17 20:26 | 2025 Nov 17 14:26 |
| Time of closest approach (UTC) | 2025 Oct 18 14:47:03.527 |
| Minimum distance | 30.658 km |
| Height difference | 0.782 km |
| Relative speed | 14.298 km/s |
| Angle between velocity vectors | 134° |
| Geographic position | 59.9°N, 120.6°E |
| Height | 589 km |
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