| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | IRIDIUM 33 DEB |
| Spacetrack catalog number | 39161 | 33879 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Feb 28 05:06 | 2021 Feb 27 20:06 |
| Time of closest approach (UTC) | 2021 Jan 22 18:29:52.066 |
| Minimum distance | 26.337 km |
| Height difference | 1.867 km |
| Relative speed | 10.936 km/s |
| Angle between velocity vectors | 93° |
| Geographic position | 81.5°S, 178.6°E |
| Height | 674 km |
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