| Primary satellite | Secondary satellite |
| Name | MOS 1 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17528 | 35071 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 19 12:23 | 2021 Jan 18 14:25 |
| Time of closest approach (UTC) | 2020 Dec 01 01:25:03.124 |
| Minimum distance | 73.128 km |
| Height difference | -1.121 km |
| Relative speed | 9.377 km/s |
| Angle between velocity vectors | 77° |
| Geographic position | 69.8°S, 94.6°E |
| Height | 642 km |
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