| Primary satellite | Secondary satellite |
| Name | MOS 1 Rocket | COSMOS 2251 DEB |
| Spacetrack catalog number | 17528 | 34671 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 19 12:23 | 2021 Jan 19 09:46 |
| Time of closest approach (UTC) | 2020 Dec 02 01:46:27.236 |
| Minimum distance | 12.350 km |
| Height difference | 0.753 km |
| Relative speed | 14.875 km/s |
| Angle between velocity vectors | 171° |
| Geographic position | 5.9°S, 112.2°W |
| Height | 764 km |
|