| Primary satellite | Secondary satellite |
| Name | CZ-2C R/B | COSMOS 2251 DEB |
| Spacetrack catalog number | 28480 | 39586 |
| Radar cross section | large | small |
| Epoch of two-line elements (UTC) | 2021 Jan 17 20:06 | 2021 Jan 17 05:51 |
| Time of closest approach (UTC) | 2020 Dec 06 06:06:21.371 |
| Minimum distance | 52.158 km |
| Height difference | 2.767 km |
| Relative speed | 11.361 km/s |
| Angle between velocity vectors | 101° |
| Geographic position | 73.0°S, 11.8°W |
| Height | 934 km |
|