| Primary satellite | Secondary satellite |
| Name | Cosmos 1867 | IRIDIUM 138 |
| Spacetrack catalog number | 18187 | 43071 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2024 Dec 03 19:52 | 2024 Dec 03 14:05 |
| Time of closest approach (UTC) | 2024 Nov 11 14:29:17.854 |
| Minimum distance | 6.855 km |
| Height difference | 1.692 km |
| Relative speed | 3.281 km/s |
| Angle between velocity vectors | 25° |
| Geographic position | 31.5°S, 65.6°W |
| Height | 790 km |
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