| Primary satellite | Secondary satellite |
| Name | Cosmos 1908 Rocket | COSMOS 2535 DEB |
| Spacetrack catalog number | 18749 | 44641 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 10:51 | 2021 Jan 14 15:00 |
| Time of closest approach (UTC) | 2020 Dec 05 02:31:31.779 |
| Minimum distance | 14.034 km |
| Height difference | 3.550 km |
| Relative speed | 14.938 km/s |
| Angle between velocity vectors | 163° |
| Geographic position | 82.1°N, 164.5°W |
| Height | 620 km |
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