| Primary satellite | Secondary satellite |
| Name | Cosmos 1328 Rocket | Iridium Sim2 |
| Spacetrack catalog number | 12988 | 24926 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 13:29 | 2024 Dec 22 14:51 |
| Time of closest approach (UTC) | 2024 Dec 24 21:30:21.675 |
| Minimum distance | 3.291 km |
| Height difference | -2.810 km |
| Relative speed | 14.699 km/s |
| Angle between velocity vectors | 155° |
| Geographic position | 63.9°S, 153.4°E |
| Height | 640 km |
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