| Primary satellite | Secondary satellite |
| Name | Cosmos 1908 Rocket | CZ-4 DEB |
| Spacetrack catalog number | 18749 | 35325 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 14 22:10 | 2021 Jan 14 07:33 |
| Time of closest approach (UTC) | 2020 Dec 09 15:46:27.510 |
| Minimum distance | 6.786 km |
| Height difference | -1.412 km |
| Relative speed | 14.985 km/s |
| Angle between velocity vectors | 169° |
| Geographic position | 80.5°S, 109.4°E |
| Height | 660 km |
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