| Primary satellite | Secondary satellite |
| Name | Cosmos 1908 Rocket | SL-16 DEB |
| Spacetrack catalog number | 18749 | 39871 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 14 22:10 | 2021 Jan 14 16:18 |
| Time of closest approach (UTC) | 2020 Dec 05 11:29:57.038 |
| Minimum distance | 69.993 km |
| Height difference | 3.043 km |
| Relative speed | 7.585 km/s |
| Angle between velocity vectors | 61° |
| Geographic position | 70.7°S, 71.8°W |
| Height | 658 km |
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