| Primary satellite | Secondary satellite |
| Name | Cosmos 1328 Rocket | Iridium Sim1 |
| Spacetrack catalog number | 12988 | 24925 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 13:29 | 2024 Dec 22 16:28 |
| Time of closest approach (UTC) | 2024 Dec 24 15:50:45.116 |
| Minimum distance | 3.645 km |
| Height difference | 3.594 km |
| Relative speed | 14.792 km/s |
| Angle between velocity vectors | 156° |
| Geographic position | 62.2°N, 57.7°E |
| Height | 613 km |
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