| Primary satellite | Secondary satellite |
| Name | Cosmos 1844 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17974 | 33972 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 16 18:17 | 2021 Jan 16 13:10 |
| Time of closest approach (UTC) | 2020 Dec 08 19:56:20.327 |
| Minimum distance | 95.811 km |
| Height difference | 1.387 km |
| Relative speed | 13.657 km/s |
| Angle between velocity vectors | 134° |
| Geographic position | 39.6°S, 79.1°E |
| Height | 843 km |
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