| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | IRIDIUM 177 |
| Spacetrack catalog number | 39161 | 56727 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2025 Jan 19 04:13 | 2025 Jan 19 00:13 |
| Time of closest approach (UTC) | 2024 Dec 10 05:38:59.573 |
| Minimum distance | 68.738 km |
| Height difference | -5.354 km |
| Relative speed | 15.036 km/s |
| Angle between velocity vectors | 173° |
| Geographic position | 57.7°S, 105.4°W |
| Height | 655 km |
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