| Primary satellite | Secondary satellite |
| Name | CZ-2C R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 37766 | 38221 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 15 04:35 | 2021 Jan 12 08:49 |
| Time of closest approach (UTC) | 2020 Dec 03 01:10:44.178 |
| Minimum distance | 95.492 km |
| Height difference | -1.118 km |
| Relative speed | 8.552 km/s |
| Angle between velocity vectors | 69° |
| Geographic position | 68.3°S, 96.9°W |
| Height | 671 km |
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