| Primary satellite | Secondary satellite |
| Name | CZ-2D R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 28738 | 34970 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 18:50 | 2021 Jan 17 10:52 |
| Time of closest approach (UTC) | 2020 Dec 05 07:33:07.279 |
| Minimum distance | 297.902 km |
| Height difference | 2.227 km |
| Relative speed | 15.153 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 16.1°N, 167.2°E |
| Height | 529 km |
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