| Primary satellite | Secondary satellite |
| Name | Cosmos 858 Rocket | Oscar 19 |
| Spacetrack catalog number | 9444 | 20442 |
| Radar cross section | large | medium |
| Epoch of two-line elements (UTC) | 2021 Jan 23 17:46 | 2021 Jan 23 19:27 |
| Time of closest approach (UTC) | 2020 Nov 28 03:04:07.879 |
| Minimum distance | 21.247 km |
| Height difference | 6.204 km |
| Relative speed | 14.123 km/s |
| Angle between velocity vectors | 142° |
| Geographic position | 73.0°N, 136.9°E |
| Height | 783 km |
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