| Primary satellite | Secondary satellite |
| Name | IRIDIUM 138 | COSMOS 2251 DEB |
| Spacetrack catalog number | 43071 | 34024 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 20:13 | 2024 Dec 22 20:41 |
| Time of closest approach (UTC) | 2024 Dec 27 08:43:57.934 |
| Minimum distance | 1.624 km |
| Height difference | -1.397 km |
| Relative speed | 6.580 km/s |
| Angle between velocity vectors | 52° |
| Geographic position | 72.3°S, 52.6°W |
| Height | 805 km |
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