| Primary satellite | Secondary satellite |
| Name | Cosmos 1844 Rocket | DMSP 5D-3 F17 |
| Spacetrack catalog number | 17974 | 29522 |
| Radar cross section | large | large |
| Epoch of two-line elements (UTC) | 2021 Jan 16 18:17 | 2021 Jan 16 18:08 |
| Time of closest approach (UTC) | 2020 Dec 07 22:32:21.615 |
| Minimum distance | 13.141 km |
| Height difference | -2.267 km |
| Relative speed | 12.807 km/s |
| Angle between velocity vectors | 119° |
| Geographic position | 71.1°N, 148.4°E |
| Height | 857 km |
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