| Primary satellite | Secondary satellite |
| Name | AO-91 | COSMOS 2251 DEB |
| Spacetrack catalog number | 43017 | 34037 |
| Radar cross section | small | small |
| Epoch of two-line elements (UTC) | 2021 Mar 06 11:05 | 2021 Mar 06 10:49 |
| Time of closest approach (UTC) | 2021 Jan 18 07:17:28.218 |
| Minimum distance | 72.976 km |
| Height difference | 3.562 km |
| Relative speed | 13.759 km/s |
| Angle between velocity vectors | 136° |
| Geographic position | 73.9°S, 88.8°E |
| Height | 805 km |
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