| Primary satellite | Secondary satellite |
| Name | GP-B | IRIDIUM 177 |
| Spacetrack catalog number | 28230 | 56727 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2025 Dec 09 03:59 | 2025 Dec 09 03:49 |
| Time of closest approach (UTC) | 2024 Nov 13 16:33:52.090 |
| Minimum distance | 99.341 km |
| Height difference | 0.810 km |
| Relative speed | 15.064 km/s |
| Angle between velocity vectors | 175° |
| Geographic position | 25.4°S, 60.2°W |
| Height | 637 km |
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