| Primary satellite | Secondary satellite |
| Name | IRIDIUM 138 | Cosmos 2056 Rocket |
| Spacetrack catalog number | 43071 | 20433 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 22 20:13 | 2024 Dec 22 11:25 |
| Time of closest approach (UTC) | 2024 Dec 28 17:29:47.611 |
| Minimum distance | 1.197 km |
| Height difference | 0.898 km |
| Relative speed | 14.425 km/s |
| Angle between velocity vectors | 150° |
| Geographic position | 48.4°N, 1.3°E |
| Height | 785 km |
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