| Primary satellite | Secondary satellite |
| Name | MOS 1 | COSMOS 2251 DEB |
| Spacetrack catalog number | 17527 | 33972 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 21:28 | 2021 Jan 17 17:42 |
| Time of closest approach (UTC) | 2020 Dec 04 16:22:58.083 |
| Minimum distance | 202.152 km |
| Height difference | 5.255 km |
| Relative speed | 12.471 km/s |
| Angle between velocity vectors | 116° |
| Geographic position | 75.1°S, 153.5°W |
| Height | 917 km |
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