| Primary satellite | Secondary satellite |
| Name | STRAND 1 | Cosmos 858 |
| Spacetrack catalog number | 39090 | 9443 |
| Radar cross section | small | large |
| Epoch of two-line elements (UTC) | 2023 Jun 02 12:08 | 2023 Jun 02 18:01 |
| Time of closest approach (UTC) | 2023 Apr 01 04:11:33.527 |
| Minimum distance | 6.731 km |
| Height difference | 0.132 km |
| Relative speed | 14.065 km/s |
| Angle between velocity vectors | 141° |
| Geographic position | 72.8°S, 173.8°W |
| Height | 803 km |
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