| Primary satellite | Secondary satellite |
| Name | IRIDIUM 138 | COSMOS 2251 DEB |
| Spacetrack catalog number | 43071 | 33948 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2024 Dec 22 20:13 | 2024 Dec 23 03:01 |
| Time of closest approach (UTC) | 2024 Dec 26 12:38:55.215 |
| Minimum distance | 4.846 km |
| Height difference | 1.283 km |
| Relative speed | 5.566 km/s |
| Angle between velocity vectors | 44° |
| Geographic position | 70.4°S, 109.0°W |
| Height | 805 km |
|