| Primary satellite | Secondary satellite |
| Name | Cosmos 923 Rocket | deb Kosmos-397 |
| Spacetrack catalog number | 10121 | 5155 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2025 Jul 12 12:37 | 2025 Jul 13 04:26 |
| Time of closest approach (UTC) | 2025 Jun 17 03:26:12.249 |
| Minimum distance | 293.019 km |
| Height difference | 4.511 km |
| Relative speed | 12.363 km/s |
| Angle between velocity vectors | 112° |
| Geographic position | 49.8°N, 13.0°E |
| Height | 765 km |
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