| Primary satellite | Secondary satellite |
| Name | Cosmos 923 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 10121 | 34121 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2025 Jul 12 12:37 | 2025 Jul 12 22:10 |
| Time of closest approach (UTC) | 2025 Jun 22 10:55:47.385 |
| Minimum distance | 12.684 km |
| Height difference | -4.602 km |
| Relative speed | 12.862 km/s |
| Angle between velocity vectors | 118° |
| Geographic position | 57.7°S, 68.0°W |
| Height | 790 km |
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