| Primary satellite | Secondary satellite |
| Name | ESTCUBE 1 | COSMOS 2535 DEB |
| Spacetrack catalog number | 39161 | 44712 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Feb 28 05:06 | 2021 Feb 27 21:47 |
| Time of closest approach (UTC) | 2021 Jan 23 21:26:04.484 |
| Minimum distance | 39.214 km |
| Height difference | -3.290 km |
| Relative speed | 4.714 km/s |
| Angle between velocity vectors | 37° |
| Geographic position | 81.7°N, 84.5°W |
| Height | 674 km |
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