| Primary satellite | Secondary satellite |
| Name | CZ-2C R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 37766 | 35898 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 04:35 | 2021 Jan 13 08:48 |
| Time of closest approach (UTC) | 2020 Dec 02 17:58:05.660 |
| Minimum distance | 6.101 km |
| Height difference | -1.633 km |
| Relative speed | 13.152 km/s |
| Angle between velocity vectors | 122° |
| Geographic position | 74.1°N, 63.6°E |
| Height | 697 km |
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