| Primary satellite | Secondary satellite |
| Name | AO-27 | Cosmos 858 |
| Spacetrack catalog number | 22825 | 9443 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2023 Mar 19 15:57 | 2023 Mar 19 16:57 |
| Time of closest approach (UTC) | 2023 Jan 31 04:03:24.845 |
| Minimum distance | 11.702 km |
| Height difference | -3.422 km |
| Relative speed | 14.879 km/s |
| Angle between velocity vectors | 172° |
| Geographic position | 25.6°N, 123.5°W |
| Height | 794 km |
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