| Primary satellite | Secondary satellite |
| Name | CAS-6 | COSMOS 2251 DEB |
| Spacetrack catalog number | 44881 | 36002 |
| Radar cross section | medium | small |
| Epoch of two-line elements (UTC) | 2021 Feb 28 01:08 | 2021 Feb 27 15:39 |
| Time of closest approach (UTC) | 2021 Jan 18 10:49:14.742 |
| Minimum distance | 1.302 km |
| Height difference | 0.980 km |
| Relative speed | 15.064 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 15.2°S, 179.4°W |
| Height | 629 km |
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