| Primary satellite | Secondary satellite |
| Name | PCSat | IRIDIUM 121 |
| Spacetrack catalog number | 26931 | 42812 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2025 Apr 28 17:33 | 2025 Apr 28 17:49 |
| Time of closest approach (UTC) | 2025 Mar 24 20:21:51.129 |
| Minimum distance | 57.725 km |
| Height difference | -5.239 km |
| Relative speed | 13.847 km/s |
| Angle between velocity vectors | 137° |
| Geographic position | 50.2°S, 48.5°E |
| Height | 803 km |
|