| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | SL-16 DEB |
| Spacetrack catalog number | 39161 | 39898 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Feb 28 05:06 | 2021 Feb 26 19:30 |
| Time of closest approach (UTC) | 2021 Jan 24 00:09:22.377 |
| Minimum distance | 99.102 km |
| Height difference | 5.600 km |
| Relative speed | 14.953 km/s |
| Angle between velocity vectors | 168° |
| Geographic position | 26.5°S, 13.4°W |
| Height | 663 km |
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