| Primary satellite | Secondary satellite |
| Name | HEATHSAT | Cosmos 858 |
| Spacetrack catalog number | 22827 | 9443 |
| Radar cross section | medium | large |
| Epoch of two-line elements (UTC) | 2023 Sep 28 18:51 | 2023 Sep 28 21:28 |
| Time of closest approach (UTC) | 2023 Jun 13 07:56:26.199 |
| Minimum distance | 21.110 km |
| Height difference | -0.142 km |
| Relative speed | 14.640 km/s |
| Angle between velocity vectors | 159° |
| Geographic position | 66.1°S, 148.4°W |
| Height | 811 km |
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