| Primary satellite | Secondary satellite |
| Name | Cosmos 1844 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17974 | 34323 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 10:55 | 2021 Jan 17 15:11 |
| Time of closest approach (UTC) | 2020 Dec 02 22:58:00.132 |
| Minimum distance | 128.662 km |
| Height difference | -1.174 km |
| Relative speed | 12.916 km/s |
| Angle between velocity vectors | 121° |
| Geographic position | 53.2°S, 84.5°W |
| Height | 846 km |
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