| Primary satellite | Secondary satellite |
| Name | CZ-6A DEB | IRIDIUM 121 |
| Spacetrack catalog number | 55214 | 42812 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2024 Dec 23 01:04 | 2024 Dec 22 16:39 |
| Time of closest approach (UTC) | 2024 Dec 27 10:00:52.442 |
| Minimum distance | 0.877 km |
| Height difference | -0.386 km |
| Relative speed | 14.719 km/s |
| Angle between velocity vectors | 165° |
| Geographic position | 70.6°S, 161.6°E |
| Height | 806 km |
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