| Primary satellite | Secondary satellite |
| Name | Iridium Sim1 | Cosmos 1328 Rocket |
| Spacetrack catalog number | 24925 | 12988 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 03:46 | 2024 Dec 23 02:24 |
| Time of closest approach (UTC) | 2024 Dec 25 05:34:35.957 |
| Minimum distance | 4.908 km |
| Height difference | 4.852 km |
| Relative speed | 14.737 km/s |
| Angle between velocity vectors | 156° |
| Geographic position | 62.4°S, 30.8°E |
| Height | 635 km |
|