| Primary satellite | Secondary satellite |
| Name | Cosmos 1842 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17912 | 35291 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Apr 11 03:22 | 2021 Apr 11 02:11 |
| Time of closest approach (UTC) | 2021 Mar 02 09:18:17.482 |
| Minimum distance | 221.727 km |
| Height difference | 0.761 km |
| Relative speed | 10.460 km/s |
| Angle between velocity vectors | 88° |
| Geographic position | 71.4°S, 103.3°W |
| Height | 659 km |
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