| Primary satellite | Secondary satellite |
| Name | First-Move | COSMOS 2251 DEB |
| Spacetrack catalog number | 39439 | 34873 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Feb 27 12:52 | 2021 Feb 27 15:38 |
| Time of closest approach (UTC) | 2021 Jan 22 09:02:54.679 |
| Minimum distance | 40.465 km |
| Height difference | -2.388 km |
| Relative speed | 11.165 km/s |
| Angle between velocity vectors | 96° |
| Geographic position | 73.2°N, 36.1°W |
| Height | 680 km |
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