| Primary satellite | Secondary satellite |
| Name | Cosmos 1891 Rocket | deb Kosmos-1375 |
| Spacetrack catalog number | 18403 | 17800 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 20:38 | 2021 Jan 17 20:56 |
| Time of closest approach (UTC) | 2020 Nov 30 09:37:25.527 |
| Minimum distance | 6.186 km |
| Height difference | 2.275 km |
| Relative speed | 7.478 km/s |
| Angle between velocity vectors | 61° |
| Geographic position | 65.4°N, 178.0°W |
| Height | 1020 km |
|