| Primary satellite | Secondary satellite |
| Name | Cosmos 1538 Rocket | IRIDIUM 159 |
| Spacetrack catalog number | 14760 | 43578 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 11:37 | 2024 Dec 23 03:37 |
| Time of closest approach (UTC) | 2024 Dec 24 21:41:07.071 |
| Minimum distance | 3.781 km |
| Height difference | -0.226 km |
| Relative speed | 14.541 km/s |
| Angle between velocity vectors | 154° |
| Geographic position | 41.3°N, 133.9°W |
| Height | 783 km |
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