| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | UNISAT 6 |
| Spacetrack catalog number | 39161 | 40012 |
| Radar cross section | small | medium |
| Epoch of two-line elements (UTC) | 2021 Feb 28 05:06 | 2021 Feb 27 19:42 |
| Time of closest approach (UTC) | 2021 Jan 21 04:55:59.411 |
| Minimum distance | 13.795 km |
| Height difference | 2.358 km |
| Relative speed | 13.249 km/s |
| Angle between velocity vectors | 123° |
| Geographic position | 73.5°S, 63.0°E |
| Height | 673 km |
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